Answers
Circle the first line.
His mistake was: He substituted y from 2nd equation in 1st equation incorrectly. There is a minus sign before y and it wasn't taken into the account.
The correct steps are:
2x - y = 18
2x - (4x + 2) = 18
2x - 4x - 2 = 18
-2x - 2 = 18
-2x = 20
x = -10
y = 4x + 2
y = 4(-10) + 2
y = -40 + 2
y = -38
Related Questions
Use technology, what is the solution to this system? 4x+8y=30
Answers
Answer:
y=-1/2x+15/4
Step-by-step explanation:
transfer the equation into slope intercept form. subtract 4x from each side getting 8y=-4x+30 then divide by 8.
1. The area of a rectangular carpet is X² + X - 2. HINT: Area = length X breadth
a). if X is a whole number, use factorization to find the length and the breadth of the carpet in terms of X.
b). if X = 2 m, find the actual dimensions of the carpet.
c). it costs R50 per square metre to make such this carpet. how much will it cost to manufacture 5 carpets?
Answers
Answer:
look above
Step-by-step explanation:
hopeit hepls
Which equation is represented by the graph below ?
Answers
The equation that represent the graph is y = (1/2)eˣ , Option B is the correct answer.
What is an Exponential Function ?An exponential function is what is denoted as y = eˣ
The graph has to be studied and the equation has to be determined.
To determine we will consider x = 0 for all the equation ,. which will give the y intercept , which is below 1 so Option C and D are stroked out.
Now we plot the graph for equation A and B
It can be easily understood from the graph that at x =0 , y = 0.5
Therefore , the equation that represent the graph is
y = (1/2)eˣ
Option B is the correct answer.
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Prove: ∠1 and ∠14 are supplementary angles.
Answers
Answer:
can you please send the images of figure of these angle
What is the distance between the following points?
Answers
Answer:
B
10
Step-by-step explanation:
go up 7 then over 3, add them together and you got 10
Identify the type of function represented by f(x) = 2(1/2)^x
A. Exponential growth
B. Linear
C. Exponential decay
OD. Quadratic
Answers
Answer:
C) Exponential Decay
Step-by-step explanation:
Because the base inside of the parentheses is less than 1, the function will only get exponentially smaller over time.
Select the correct answer.
Which equation is equivalent to the given equation?
- 4(x - 5) + 8x = 9x - 3
A.
-5x = -23
B.
5x = 17
C.
-5x = 2
D.
5x = -12
Answers
Answer:
A. -5x = -23
Step-by-step explanation:
First you have to simplify the equation - 4(x - 5) + 8x = 9x - 3
-4x + 20 + 8x = 9x -3
9x - 4x = 20 + 3
5x = 23
=> equivalent to answer A.
The equivalent expression is,
⇒ - 5x = - 23
We have to given that,
An expression is,
- 4 (x - 5) + 8x = 9x - 3
Now, We can simplify the expression for equivalent expression,
- 4 (x - 5) + 8x = 9x - 3
Apply distributive property, we get;
- 4x + 20 + 8x = 9x - 3
4x + 20 = 9x - 3
4x - 9x = - 20 - 3
- 5x = - 23
Therefore, The equivalent expression is,
⇒ - 5x = - 23
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Which polynomial is prime?
O x²+x+1
O x²-x-2
O x²-12x + 11
Ox²+2x-8
Answers
Answer:
The correct answer is x^2 + x + 1.
Step-by-step explanation:
A prime polynomial is one that cannot be factored. To solve this problem, we can use the process of elimination by eliminating all answer choices that can be factored.
x^2 - x - 2 = (x - 2)*(x + 1)
x^2 - 12x + 11 = (x - 11)*(x - 1)
x^2 + 2x - 8 = (x + 4)*(x - 2)
Since we cannot factor x^2 + x + 1, and we can factor all of the other answer choices, we know that x^2 + x + 1 is the answer.
Hope this helps!
Maria orders t-shirts for her volleyball camp. Adult-sized T-Shirts cost $6.25 each and youth-sized T-Shirts cost $4.50. Maria has $550 to purchase both adult-sized and youth-sized T-Shirts. If she purchases 45 youth-sized T-Shirts, determine algebraically the maximum number of adult-sized T-Shirts she can purchase.
Answers
Answer:
55
Step-by-step explanation:
45 * 4.50 = 202.5
550 - 202.5 = 347.5
347.5/6.25 = 55.6 (55 full t shirts)
Part 1 - Application
If the length of an arc of a circle of radius 7 is approximately 10.99 cm. What is the measure of the central
angle associated with the arc? Use 3.14 for It. Give your answer in degrees and radians (approximate to two
decimals and exact).
Answers
The measure of the central angle is 89.95 degree or 1.57 radians if the radius of the circle is 7 cm.
What is a circle?It is described as a set of points, where each point is at the same distance from a fixed point (called the centre of a circle)
We have a length of an arc of a circle of radius 7 is approximately 10.99 cm.
The radius r = 7 cm
The arc length l = 10.99 cm
We know,
l = rθ
θ is the central angle.
θ = l/r = 10.99/7 = 1.57 radians
To convert 1.57 radians into the degree multiply it by 180/π
θ = 89.95 degree
Thus, the measure of the central angle is 89.95 degree or 1.57 radians if the radius of the circle is 7 cm.
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Given: ΔABC (to the right)
AB=15
BD=9
AD⊥BC
m∠C=30°
Find Perimeter of ABC
Answers
Applying the Pythagorean theorem and the trigonometric ratios, the perimeter of triangle ABC is: 68.8 units.
What is the Perimeter of a Triangle?The perimeter of a triangle = sum of its 3 sides.
Given the following:
AB = 15 BD = 9m∠C=30°Use the Pythagorean theorem to find AD considering triangle ADB as a right triangle:
AD = √(15² - 9²)
AD = 12 units
Use the trigonometric ratios to find DC and AC:
sin 30 = AD/AC
sin 30 = 12/AC
AC = 12/sin 30
AC = 24 units
tan 30 = AD/DC
tan 30 = 12/DC
DC = 12/tan 30
DC ≈ 20.8 units
BC = BD + DC = 9 + 20.8
BC = 29.8 units.
Perimeter of triangle ABC = BC + AB + AC
Perimeter of triangle ABC = 29.8 + 15 + 24
Perimeter of triangle ABC = 68.8 units.
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1 Pound brown sugar is equivalent to _____ cups.
Answers
Answer:
3 1/2 or 3.5 cups is equal to 1 pound
Step-by-step explanation:
1 Pound brown sugar is equivalent to ___3 1/2 or 3.5__ cups.
Hope This Helped
Answer:
3½ cups
Step-by-step explanation:
What is the value of x in the diagram
Answers
Answer:
51°
Step-by-step explanation:
the given angle of 102° is the arc angle between the 2 segment end points on the circle arc.
and this arc angle is always a seen from the center of the circle.
by moving the reference point back (to the other side of the circle) to the circle arc that angle is cut in half.
you could move that point to anywhere on the arc of the circle outside of the 2 endpoints, and the angle stays always the same.
FYI - now, if you move that point into the top half-circle between the 2 end points, the perspective flips around, and that angle becomes half of the 360-102 = 258° arc angle.
Which image is a reflection of the orange letter K in Quadrant I?
I'll give you brainliest if you actually answer my question
Answers
The answer is the green K in quadrant IV
what is the Cartesian co-ordinate system?A Cartesian coordinate system in a plane is a coordinate system that specifies each point uniquely by a pair of numerical coordinates.
Given here: The K in the fourth quadrant is a reflection of K in the first quadrant because it first flips the K and but there is no change in the position of the x-axis quite clearly.
Hence, The answer is the green K in quadrant IV
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Find the Area (Need help ASAP)
Answers
Explanation:
Answer:
32
It wont always be easy, but always try to do what ' s right!
In a world of worriers, be the warrior!
When nothing goes right, go left.
How does human behavior explain why the demand line slopes downward?
Answers
The decreasing of the prices and increasing of buying are correlated with the human behavior.
What is a Demand Graph ?Demand graph is the curve in the study of economics which tells us about the number of units purchased or the demand of the product with respect to the price.
The demand line slopes downward means the price is decreasing and more people are buying it.
The increase in the buying of the goods on decreasing prices is affected by human behavior as when the price decrease , the middle class people have a tendency to buy more quantity and
even there is need to satisfy unsatisfied wants , If a product was costlier before and the prices have decrease then to satisfy the wants , the people buy it ,
Hence decreasing of the prices and increasing of buying are correlated with the human behavior.
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Consider the following cumulative probability distribution.
1 2 3
4
0.09 0.31 0.48 0.65 0.84
5
1
a. calculate a{xs 4). (round your answer to 2 decimal places.)
pox s 4)
p
b. calculate p{x= 3). (round your answer to 2 decimal places.)
p(x = 3)
#
+
e
10
19
34
m
c. calculate p(2 s x s 4). (round your answer to 2 decimal places.)
p(2 5 x 84)
Answers
The solution [tex]P(x \leq 4),p{x= 3), p(2 \leq * \leq 4)[/tex] is mathematically given as
[tex]P(2 \leq X \leq 4)=0.84[/tex]P(X=3)= 0.17[tex]P(2 < =X\leq 4)=0.53[/tex]What is the solution [tex]P(x \leq 4),p{x= 3), p(2 \leq * \leq 4)[/tex]?Generally, the equation for the Probability of P(X=3) is mathematically given as
b)
[tex]P(X=3) = P(X \leq 3)-P(X\leq 2)[/tex]
Therefore
[tex]P(X=3)= 0.65-0.48[/tex]
P(X=3)= 0.17
c)
[tex]P(2\leq X\leq 4) = P(X\leq 4)-P(X\leq 1)\\\\\\P(2\leq X\leq 4) = 0.84-0.31'[/tex]
[tex]P(2 < =X\leq 4)=0.53[/tex]
a)
[tex]P(2\leq X\leq 4)=0.84[/tex]
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In the figure below, which term best describes point X?
B
OA. Centroid
OB. Incenter
O C. Circumcenter
OD. Orthocenter
Answers
Answer:
Centroid
Step-by-step explanation:
It is a centroid because x is the center of the triangle
may I get brainliest?
Hope this helps :)
The term best describes point X is option A. Centroid.
What is the centroid of a triangle and its coordinates?The point of intersection of a triangle's medians is its centroid (the lines joining each vertex with the midpoint of the opposite side).
here, we have,
If the surface is plane triangle approximately and mass is uniformly distributed, then its center of mass will lie on the centroid of that triangle.
we have,
If the triangle has its vertices as (x1, y1) (x2,y2) (x3,y3)
then the coordinates of the centroid of that triangle is given by:
(x, y ) = (x1+x2+x3/3 , y1+y2+y3/3 )
Hence, The term best describes point X is option A. Centroid.
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Question 4.
The angle of elevation of the top of a tree from a point on the ground 22 m away is 24⁰°.
Calculate the height of the tree (in metres) correct to 2 decimal places.
22 m
tree
Answers
Answer:
9.80 m
Step-by-step explanation:
The mnemonic SOH CAH TOA is intended to remind you of the relationship between sides of a right triangle and its angles.
__
setupThe geometry of this problem can be modeled by a right triangle, so these relations apply. We are given an angle and adjacent side, and asked for the opposite side, so the relation of interest is ...
Tan = Opposite/Adjacent
Using the given values, we have ...
tan(24°) = AC/AB = (tree height)/(distance from tree)
tan(24°) = AC/(22 m)
solutionMultiplying by 22 m gives ...
tree height = AC = (22 m)·tan(24°) ≈ 9.79503 m
The height of the tree is about 9.80 meters.
ABC Car Share Inc. offers car sharing for a $199 yearly fee plus $14/hr for the
use of its car share. What is the total cost for a person who purchases a car
share and uses it for 72 hours total time?
OA. $1307
OB. $1107
C. $1207
OD.
$1407
SUBMIT
Answers
Answer:
C
Step-by-step explanation:
199+(14*72) = 1207
annual fee plus cost for each hour used
rearrange the equation 12n + 3px = 7px
Answers
From factoring, the given equation can be rearranged as [tex]x=\frac{3n}{p}[/tex].
Factoring
In math, factoring or factorization is used to write an algebraic expression in factors. There are some rules for factorization. One of them is a factor out a common term for example: x²-x= x(x-1), where x is a common term.
For solving this question, the given equation should be rewritten using the variables n and p in different sides. After that, you should factor out a common term.
[tex]12n + 3px = 7px\\ \\ 12n=7px-3px\\ \\ 12n=4px\\ \\ x=\frac{12n}{4p} =\frac{4*3n}{4p}=\frac{3n}{p}\\ \\ x=\frac{3n}{p}[/tex]
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If the triangle on the grid below is translated by using the rule (x, y) right-arrow (x + 5, y minus 2), what will be the coordinates of B prime?
On a coordinate plane, triangle A B C has points (negative 1, 0), (negative 5, 0), (negative 1, 2).
(–2, 0)
(0, –2)
(5, –7)
Answers
Using translation concepts, it is found that the coordinates of the image of point B is given by: (0, –2).
What is a translation?A translation is represented by a change in the function graph, according to operations such as multiplication or sum/subtraction in it's definition.
In this problem, the rule is given by:
(x,y) -> (x + 5, y - 2).
Hence, the image of point B, given by B', is:
(-5,0) -> (-5 + 5, 0 - 2) -> (0,-2).
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If f(x)=8-10x and g(x) =5x +4, what is the value of (fog)(-2)?
Answers
Answer:
68
Step-by-step explanation:
Any function is evaluated by putting the argument value where the variable is, then doing the arithmetic. When the argument is another function value, that function value is evaluated first.
__
f∘gThe "o" in (fog) is a stand-in for the "ring operator" (∘) which is the operator used to signify a composition. A composition is evaluated right-to-left. That means (f∘g)(x) ≡ f(g(x)). The value of g(x) is found first, and is operated on by the function f.
Writing the composition in the form f(g(x)) lets you identify the layers of parentheses. As with any expression evaluation, the Order of Operations applies. It tells you to evaluate the expression in the innermost parentheses and work your way out.
g(-2)To evaluate (f∘g)(-2) = f(g(-2)), we must first evaluate g(-2). That is ...
g(x) = 5x +4
g(-2) = 5(-2) +4 = -10 +4 = -6 . . . . . put -2 where x is, do the math
f(g(-2))Now that we know g(-2) = -6, we know this expression is ...
f(-6) = 8 -10(-6) = 8 +60 = 68 . . . . . substitute for x in 8-10x
Then the value we're looking for is ...
(f∘g)(-2) = 68
What are the coordinates of the point where the line y = -x +5 intersects the x-axis?
O (0, -3)
O (0,3)
O (-3,0)
0 (3,0)
Answers
The answer is (3,0)
Sure hope this helps you
Find the interest and the amount repaid.
Principal 500.00
Rate 12%
Time 18 months
what is the amount
Answers
Answer:
3844.98
Step-by-step explanation:
Use this formula: P(1+b)^x
500(1.12)^18 (put in calculator).
Hope this helps!
If not I am sorry.
Kenji is using walnuts to bake muffins and granola for his restaurant. each batch of muffins
1
pound of walnuts. he needs 2 pounds of walnuts to make granola. kenji can use up
2
to 8 pounds of walnuts and still have enough for baking tomorrow.
uses
let b represent the number of batches of muffins kenji makes.
write an inequality that represents the situation.
Answers
Answer:
Step-by-step explanation:
1/2b + 2 ≤ 8
b ≤ 12
Answer:
Step-by-step explanation:
Stock for the jones corporation starts with a value of $39.63 and gains $0.30 in value per month. stock for the overton company starts with a value of $24.45 and gains $0.80 in value per month. when are the two stocks nearly equal in value?
Answers
Using linear functions, it is found that the two stocks will be nearly equal in 30 months.
What is a linear function?A linear function is modeled by:
y = mx + b
In which:
m is the slope, which is the rate of change, that is, by how much y changes when x changes by 1.b is the y-intercept, which is the value of y when x = 0, and can also be interpreted as the initial value of the function.Each of the stocks can be modeled by these following functions:
S1(t) = 39.63 + 0.3t.S2(t) = 24.45 + 0.8t.They will be equal when:
S1(t) = S2(t).
Hence:
39.63 + 0.3t = 24.45 + 0.8t
0.5t = 15.18
t = 15.18/0.5
t = 30.36.
Rounding, approximately 30 months.
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While traveling to europe, phelan exchanged 250 us dollars for euros. he spent 150 euros on his trip. after returning to the united states he converts his money back to us dollars. how much of the original 250 us dollars does phelan now have? round to the nearest cent.while traveling to europe, phelan exchanged 250 us dollars for euros. he spent 150 euros on his trip. after returning to the united states he converts his money back to us dollars. how much of the original 250 us dollars does phelan now have? round to the nearest cent. 1 european euro = 1.3687 us dollars
Answers
Answer:
$44.69
Step-by-step explanation:
150 x 1.3687 = $205.305 = $205.31
250 - 205.31 = $44.69
(Hope this helps ^-^)
Answer
44.70 US dollars
Step-by-step explanation: Edg right? If thats what youre reffering too then this is correct
4 friends evenly divided up an n-slice pizza. One of the friends, Harris, ate 1 fewer slice than he received.
How many slices of pizza did Harris eat?
Answers
Help pls i will give 10 points
Answers
Answer:
1/4 for blue and 3/8 for green
Step-by-step explanation:
2 blue sections out of 8
2/8 simplified is 1/4
3 green sections out of 8
3/8 is the simplest form