Regina’s work to find the surface area of a square pyramid from its net is shown below.
A square pyramid. The square base has side lengths of 9.4 inches. The triangular sides have a height of 11.9 inches.
Surface area of the pyramid = 4 (one-half (9.4) (12.8)) + 9.4 squared = 329 square inches
What error did Regina make?
She should have used One-half (9.4) (11.9) to represent the area of a single triangle.
She should have multiplied all the terms inside the parentheses by 4 when she simplified.
She should have used One-half (4.7) (12.8) to represent the area of a single triangle.
She should have used a different collection of shapes as the net of the pyramid.
Answers
She put 12.8 in place of 11.9 in the formula of the triangle. Then the correct option is A.
What is Geometry?It deals with the size of geometry, region, and density of the different forms both 2D and 3D.
Regina’s work to find the surface area of a square pyramid from its net is shown below.
A square pyramid. The square base has side lengths of 9.4 inches. The triangular sides have a height of 11.9 inches.
Surface area of the pyramid = 4 [one-half (9.4) (12.8)] + 9.4² = 329 square inches
Then the error done by Regina will be
She should have used One-half (9.4) (11.9) to represent the area of a single triangle.
Then the correct option is A.
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Answer:
A
Step-by-step explanation:
Related Questions
Answer question 6 for me thanks
Answers
Answer: its c
Step-by-step explanation: im a smarty boy i hope u its right or not
A 2-column table with 5 rows. Column 1 has entries 25 percent, 25 percent, 25 percent, 25 percent, Total 100 percent. Column 2 has entries 12 dollars, 12 dollars, 12 dollars, 12 dollars, Total 48 dollars.
Which of the following scenarios could be accurately modeled using this diagram?A 2-column table with 5 rows. Column 1 has entries 25 percent, 25 percent, 25 percent, 25 percent, Total 100 percent. Column 2 has entries 12 dollars, 12 dollars, 12 dollars, 12 dollars, Total 48 dollars.
Which of the following scenarios could be accurately modeled using this diagram?
Answers
The scenario that could be accurately modeled using this diagram is B. Juan Victor gave a 25% gratuity of $12 on a bill that was $48.
How to depict the information?Here is the remainder of the question:
Which of the following scenarios could be accurately modeled using this diagram?
Juan Victor gave a gratuity of $25 on a bill that was $48.
Juan Victor gave a 25% gratuity of $12 on a bill that was $48.
Juan Victor gave a gratuity of $12 on a bill that was $100.
Juan Victor gave a 12% gratuity on a bill that was $25.
A conceptual model is a representation of a system to help people understand a subject the model represents.
In this case, the scenario that could be accurately modeled using this diagram is that Juan Victor gave a 25% gratuity of $12 on a bill that was $48.
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Find the surface area of the square pyramid. Enter your answer in the box.
A square pyramid. The side length of the base is 11 centimeters. The height of each of the 4 triangular faces is 10 centimeters.
cm2
Answers
Answer:
341 cm²
Step-by-step explanation:
Formula :
Surface area = Area of 4 triangle faces + Area of square base
===============================================================
Solving :
⇒ Surface area = 4 × 1/2 × 11 × 10 + 11²
⇒ Surface area = 2 × 110 + 121
⇒ Surface area = 220 + 121
⇒ Surface area = 341 cm²
The surface area of the square pyramid is 341 square centimeter.
What is Three dimensional shape?a three dimensional shape can be defined as a solid figure or an object or shape that has three dimensions—length, width, and height.
The surface area of a square pyramid is calculated by the equation S = B + 1/2 × P × S
where B is the area of the base,
P is the perimeter of the base, and
S is the slant height of the pyramid.
the area of the base =11×11
B=121 square centimeter
The perimeter of the base = 2(11+11)
P= 44 cm
Slant height (S) is 10 cm.
Surface Area = 121 + 1/2 (44×10)
=121+220
=341 square centimeter
Hence, the surface area of the square pyramid is 341 square centimeter.
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What is the slope of the line that is parallel to the line whose equation is 4x + y2 = 0?
Answers
We know the slope formula
m=-a/bm=-4/2m=-2Parallel lines have equal slope so it has m=-2
A) on monday, you have a single request: order a for 15,000 units. it must be fulfilled by a single factory. to which factory do you send the order? explain your decision. support your argument with numbers.
Answers
Based on the above, it can be inferred that the best option to produce the 15,000 units is the factory with the lowest cost per unit.
What is the cost per unit?Unit cost is a term to refer to the value per unit of a product that a factory charges to produce it.
In this case, the best alternative to produce 15,000 products is the factory with the lowest cost per unit, since this will reduce the cost of the order.
How to find the cost per unit?To find the cost per unit we divide the total cost of the order by the number of units. For example:
If the factory tells me that it charges me 10,000 to make 15,000 units, while another one charges me 8,000 to make 15,000 units. Which one has less value per unit?To know which one is more convenient, I must divide the total value by the number of units
10,000 ÷ 15,000 = 0.668,000 ÷ 15,000 = 0.53According to the above, the second option would be the cheaper.
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Answer:
.53 facory B
Step-by-step explanation:
10000/15000 =.66
8000
Which step is the same when constructing an inscribed regular hexagon and an inscribed equilateral triangle?.
Answers
Step is the same when constructing an inscribed regular hexagon and an inscribed equilateral triangle is shown below:
What is construction?Geometric construction is the process of drawing a geometrical figure using two geometrical instruments, a compass, and a ruler.
Construction of an inscribed regular hexagon
1) Set compass width to the radius of the circle
2) Make an arc on the circle with the set radius.
3) From the previous arc draw another arc with the same radius.
4) Continue this process for the other vertex.
5) Connect all the vertices.
Construction of an inscribed equilateral triangle
1) Set compass width to the radius of the circle
2) Make an arc on the circle with the set radius.
3)From the previous arc draw another arc with the same radius.
4)Continue this process for the other vertex.
5) Connect the every other vertices point by drawing a line between every other adjacent vertex point to form an inscribed equilateral triangle.
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Please help me with this one.
Answers
Answer:
V = 16W = 48Step-by-step explanation:
The triangles are congruent when corresponding sides are congruent.
__
ΔFGH ≅ ΔABC means corresponding sides are ...
(GH, BC) = (V, 16)
(HF, CA) = (48, W)
Corresponding sides being congruent means ...
V = 16
W = 48
Can you guys pls help me with this math question
Answers
Answer:
Dimensions: 150 m x 150 m
Area: 22,500m²
Step-by-step explanation:
Given information:
Rectangular fieldTotal amount of fencing = 600mAll 4 sides of the field need to be fencedLet [tex]x[/tex] = width of the field
Let [tex]y[/tex] = length of the field
Create two equations from the given information:
Area of field: [tex]A= xy[/tex]
Perimeter of fence: [tex]2(x + y) = 600[/tex]
Rearrange the equation for the perimeter of the fence to make y the subject:
[tex]\begin{aligned} \implies 2(x + y) & = 600\\ x+y & = 300\\y & = 300-x\end{aligned}[/tex]
Substitute this into the equation for Area:
[tex]\begin{aligned}\implies A & = xy\\& = x(300-x)\\& = 300x-x^2 \end{aligned}[/tex]
To find the value of x that will make the area a maximum, differentiate A with respect to x:
[tex]\begin{aligned}A & =300x-x^2\\\implies \dfrac{dA}{dx}& =300-2x\end{aligned}[/tex]
Set it to zero and solve for x:
[tex]\begin{aligned}\dfrac{dA}{dx} & =0\\ \implies 300-2x & =0 \\ x & = 150 \end{aligned}[/tex]
Substitute the found value of x into the original equation for the perimeter and solve for y:
[tex]\begin{aligned}2(x + y) & = 600\\\implies 2(150)+2y & = 600\\2y & = 300\\y & = 150\end{aligned}[/tex]
Therefore, the dimensions that will give Tanya the maximum area are:
150 m x 150 m
The maximum area is:
[tex]\begin{aligned}\implies \sf Area_{max} & = xy\\& = 150 \cdot 150\\& = 22500\: \sf m^2 \end{aligned}[/tex]
Helpppp asap : two non-vertical lines are parallel if they have the same slope and different y-intercepts.
true
false
Answers
What is the area of triangle ABC?
Answers
Answer: The area of a triangle is the region enclosed between the sides of the triangle. Area of ΔABC = 1/2 × Base × Height
Step-by-step explanation:
Area of ΔABC= 1/2 × Base × Height = 1/2 × h × BC
If ABC is an equilateral triangle, Area of ΔABC = (√3/4)a2 where a is the length of a side of the equilateral triangle.
Thus, we have seen the formula and definition of the area of triangle ABC.
A stack of 30 science flashcards includes a review card for each of the following: 10 insects, 8 trees, 8 flowers, and 4 birds.
What is the probability of randomly selecting a bird?
express the probability as a reduced fraction
Answers
15 and 12 are the two longest side lengths of a right triangle. What should the shortest side length
be in order to form a Pythagorean Triple?
Answers
Answer:
9 units
Step-by-step explanation:
Using Pythagorean Theorem
12^2 + x^2 = 15^2
144 +x^2 = 225
x^2 = 81
x = 9
help me please i still struggle
Answers
Answer:
59 degrees
Step-by-step explanation:
Angles on a straight line add up to 180 degrees
Angles in a triangle add up to 280 degrees
180 minus 149 is 31
31 add 90 is 121
180 minus 121 is 59
f(7) if f(x) = x + 10.
Answers
Answer:
17
Step-by-step explanation:
at f(7) means x is 7
7+10 is 17
The water in a fish tank is treated by using 5 millilitres of AquaGuard for every 10 litres of
water in the tank.
Write down the ratio of the volume of AquaGuard used to the volume of water in the tank.
Give your answer in the form 1 : n
Answers
Liam has 4 ½ cups of sugar. He uses 2 ½ cups to bake bread, then borrows another 1 cup from his neighbor. He wants to bake cookies, which take 2 ½ cups of sugar. Does he have enough? How much will he have left over,or how much more does he need?
Answers
Answer:
1/2
Step-by-step explanation:
1. 4 1/2- 2 1/2= 2
2. 2+1=3
3. 3-2 1/2= 1/2
He has enough
What is the slope of a line perpendicular to the line whose equation is 5x - y = -7.
Fully simplify your answer.
Answers
keeping in mind that perpendicular lines have negative reciprocal slopes, let's check for the slope of the equation above
[tex]5x-y=-7\implies 5x-y+7=0 \\\\\\ \stackrel{\stackrel{m}{\downarrow }}{5} x+7=y\qquad \impliedby \begin{array}{|c|ll} \cline{1-1} slope-intercept~form\\ \cline{1-1} \\ y=\underset{y-intercept}{\stackrel{slope\qquad }{\stackrel{\downarrow }{m}x+\underset{\uparrow }{b}}} \\\\ \cline{1-1} \end{array}[/tex]
so a line perpendicular to that one above will have a slope of
[tex]\stackrel{~\hspace{5em}\textit{perpendicular lines have \underline{negative reciprocal} slopes}~\hspace{5em}} {\stackrel{slope}{5\implies \cfrac{5}{1}} ~\hfill \stackrel{reciprocal}{\cfrac{1}{5}} ~\hfill \stackrel{negative~reciprocal}{-\cfrac{1}{5}}}[/tex]
This set of points is on the graph of a function.
{(-3, 9), (-1, 1), (0, 0), (2, 4)}
Which points are on the graph of the inverse?
Select each correct answer.
(-9, 3)
(1, − 1)
(4,2)
(0, 0)
Answers
Answer:
Points on the inverse are [tex](1,-1), (4,2), \text{and } (0,0)[/tex]
Step-by-step explanation:
When writing the inverse function of a set of points, you simply switch the coordinates:
[tex]\text{Function}: (x,y)\\\text{Inverse}: (y,x)[/tex]
We are given the points
[tex](-3,9), (-1,1), (0,0), \text{and } (2,4)[/tex]
Using our rule for function, our new points will be
[tex](9,-3), (1,-1), (0,0), \text{and } (4,2)[/tex]
From the list, the points we have for the graph of the inverse are
[tex](1,-1), (4,2), \text{and } (0,0).[/tex]
What can you conclude about the population density from the table provided? Population Area (km²) Region A 20,178 521 Region B 1,200 451 Region C 13,475 395 Region D 6,980 426
Answers
Answer:
A got it right
Step-by-step explanation:
got it right
Which of the following shapes have faces? Select two options.
cube
rectangle
hexagon
octagon
pyramid
circle
Answers
Answer:
Objects mostly have one or more geometrical shapes like the following. These types of shapes are called three dimensional (3-D) shaped solids. All these geometrical shapes have faces. We have learned about faces like triangular faces, rectangular face, square face and circular face.
The population in the United States was roughly 161,000,000 in 1950. By 2000, it had grown to roughly 291,000,000. Assume that the population in the United States grew linearly during that period. Find a linear equation which models the population in the United States during the period 1950 to 2000
Answers
to get the equation of any straight line, we simply need two points off of it, so let's use the ones provided in the table above.
[tex]\begin{array}{|cc|ll} \cline{1-2} \stackrel{millions}{population}&year\\ \cline{1-2} 161&1950\\ 291&2000\\ \cline{1-2} \end{array}\hspace{5em} (\stackrel{x_1}{161}~,~\stackrel{y_1}{1950})\qquad (\stackrel{x_2}{291}~,~\stackrel{y_2}{2000}) \\\\\\ \stackrel{slope}{m}\implies \cfrac{\stackrel{rise} {\stackrel{y_2}{2000}-\stackrel{y1}{1950}}}{\underset{run} {\underset{x_2}{291}-\underset{x_1}{161}}} \implies \cfrac{ 50 }{ 130 }\implies \cfrac{5}{13}[/tex]
[tex]\begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-\stackrel{y_1}{1950}=\stackrel{m}{\cfrac{5}{13}}(x-\stackrel{x_1}{161}) \\\\\\ y-1950=\cfrac{5}{13}x-\cfrac{805}{13}\implies y=\cfrac{5}{13}x-\cfrac{805}{13}+1950\implies y=\cfrac{5}{13}x+\cfrac{24545}{13}[/tex]
Element X is a radioactive isotope such that every 26 years, its mass decreases by half. Given that the initial mass of a sample of Element X is 680 grams, how much of the element would remain after 19 years, to the nearest whole number?
Answers
Answer:
410 g
Step-by-step explanation:
Radioactive decay can be modeled by an exponential equation. The amount remaining (y) after a time period (t) can be expressed in terms of the initial amount (a) and the half-life (h).
y = a(1/2)^(t/h)
__
We can use this equation with the given values to find the amount remaining.
y = (680 g)(1/2)^((19 yrs)/(26 yrs)) ≈ (680 g)(0.602583)
y ≈ 410 g
About 410 grams of element X will remain after 19 years.
A random sample of 81 items is taken,producing a sample of 47.the population standard deviation is 5.89.construct a 90% confidence interval to estimate the populations mean.
Answers
The confidence interval (CI) is a range of values that, with a particular level of confidence, is likely to include a population value. The confidence interval for the given sample is 48.07656, 45.9234.
What is a confidence interval?The confidence interval (CI) is a range of values that, with a particular level of confidence, is likely to include a population value. The percentage is used to represent the location of a population mean between an upper and lower interval.
Given the random sample is 81, while the sample means is 47, the standard deviation is 5.89. Therefore, the confidence interval for 90% of the population mean is,
[tex]CI = \bar{x} \pm z \dfrac{s}{\sqrt{n}}\\\\CI = 47 \pm 1.645 \dfrac{5.89}{\sqrt{81}}\\\\CI= 47 \pm 1.07656\\\\CI = 48.07656, 45.9234[/tex]
Hence, the confidence interval for the given sample is 48.07656, 45.9234.
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Show problem set up for full credit.
Answers
Answer:
∠ QPR = 125°
Step-by-step explanation:
the angles subtended by 2 congruent arcs are congruent , that is
5x = 4x + 25 ( subtract 4x from both sides )
x = 25
Then
∠ QPR = 4x + 25 = 4(25) + 25 = 100 + 25 = 125°
What is the y-intercept of f(x) = 3x 2? a. (9,0) b. (0,9) c. (0,-9) d. (9,-9)
Answers
Answer:
f(x) = 3x + 9: y - intercept is option c. (0,-9)
f(x) = 3x - 9: y - intercept is option b. (0, 9)
Step-by-step explanation:
option a and d cant be correct since y = 0 in those answer when the y - intercept is when x = 0
If the function f(x) = 3x + 9
than x = 0
f(x) = 3(0) + 9
f(x) = 0 + 9
f(x) = 9
x = 0 and y = 9 (0, 9)
If the function f(x) = 3x - 9
than x = 0
f(x) = 3(0) - 9
f(x) = 0 - 9
f(x) = -9
x = 0 and y = -9 (0, -9)
F(X)=3x-9: y intercept is option B
4x - 1 < 11
solve the inequality
Answers
Answer:
12
Step-by-step explanation:
127491733816383827i 9273
Its The Wolf
Its like part A and needs to be answer like that
Answers
The probability that the next elk that will be caught will be unmarked is 5400/ 5625, 0.96 and 96%
The probability that the next wolf that will be caught will be unmarked is 696 / 928, 0.75 and 75%.
What are the probabilities?Probability determines the odds that a random event would happen. The probability the event occurs is 1 and the probability that the event does not occur is 0.
The probability that the next elk that will be caught will be unmarked = number of unmarked elks / total number of elks
number of unmarked elks = 5625 - 225 = 5400
5400/ 5625 = 0.96 = 96%
The probability that the next wolf that will be caught will be unmarked = number of unmarked wolfs / total number of wolfs
number of unmarked wolfs = 928 - 232 = 696
696 / 928 = 0.75 = 75%.
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It takes a bird 6 minutes to fly with a 10 mph tailwind from its nest to a bird
feeder. It takes 30 minutes for the bird to get back to its nest. What is the bird's
speed in still conditions? How far away is the bird feeder?
Answers
Answer:
The bird's speed is 50mph.
The bird's feeder is 25 miles away.
Step-by-step explanation:
10/6=x/30
6*x=30 is 6/30=x
x=5
6*5=30 so 10*5=50
x=50
mph/time=distance per hour
50/(1/2)=25 miles
Vector w has its initial point at (2, 5) and its terminal point at (-4, -2). Write the vector in component form and find its magnitude.
Answers
Answer: -6, -7
Magnitude = 9.22
Step-by-step explanation:
Answer:
Step-by-step explanation:
A triangle has sides with lengths of 12 meters, 19 meters, and 20 meters. Is it a right triangle?
Answers
======================================================
Work Shown:
[tex]a = 12\\\\b = 19\\\\c = 20\\\\a^2+b^2 = 12^2+19^2 = 505\\\\c^2 = 20^2 = 400\\\\[/tex]
The values of [tex]a^2+b^2[/tex] and [tex]c^2[/tex] are not the same number
Therefore, there's no way that [tex]a^2+b^2 = c^2[/tex] is possible, which means we do not have a right triangle.
Put another way: since [tex]a^2+b^2 \ne c^2[/tex], this means we don't have a right triangle.
Refer to the converse of the pythagorean theorem for more information.
Side note: because of that same theorem, and because [tex]a^2+b^2 > c^2[/tex] is the case, this means we have an acute triangle based on what is shown below.