Answer:
the question is incomplete, so I looked for a similar one:
After the release of radioactive material into the atmosphere from a nuclear power plant, the hay was contaminated by iodine 131 ( half-life, 8 days). If it is all right to feed the hay to cows when 10% of the iodine 131 remains, how long did the farmers need to wait to use this hay?
iodine's half life (we are given x, we need to find b):
0.5A₀ = A₀eᵇˣ
x = 8 days
we eliminate A₀ from both sides
0.5 = eᵇ⁸
ln 0.5 = ln eᵇ⁸
-0.69315 = b8
b = -0.69315 / 8 = -0.08664
since the farmers need to wait until only 10% of the iodine remains (we already calculated b, now we need to find x):
0.1A₀ = A₀eᵇˣ
0.1 = eᵇˣ
ln 0.1 = bx
where b = -0.08664
x = ln 0.1 / -0.08664 = -2.302585 / -0.08664 = 26.58 days
PLEASE HELP ME OUT I DONT UNDERSTAND
If u answer this correctly u get brainliest.
Answer: 4 and 5
Step-by-step explanation: supplementary is 2 angles that sum up to 180 degrees
Answer:
Angle 4 and angle 5
Step-by-step explanation:
Supplementary means that both angles add up to 180 degrees
what's the length of one leg of a right triangle if the length of the hypotenuse is 25 units and the length of the other leg is 15 units
A gardener is planting two types of trees: Type A is 10 feet tall and grows at a rate of 19 inches per year. Type B is 4 feet tall and grows at a rate of 25 inches per year. Algebraically determine exactly how many years it will take for these trees to be the same height.
Answer:
It'll take 12 years
Step-by-step explanation:
Given
Type A:
[tex]Initial\ Height = 10ft[/tex]
[tex]Growth = 19in[/tex]
Type B:
[tex]Initial\ Height = 4ft[/tex]
[tex]Growth = 25in[/tex]
Required
Determine the years they'll reach the same height
First, convert feet to inches in both measurements (this is done by multiplying measurement by 12):
Type A:
[tex]Initial\ Height = 10ft[/tex]
[tex]Initial\ Height = 10 * 12in[/tex]
[tex]Initial\ Height = 120in[/tex]
Type B:
[tex]Initial\ Height = 4ft[/tex]
[tex]Initial\ Height = 4 * 12in[/tex]
[tex]Initial\ Height = 48in[/tex]
The height at any year from both trees is calculated using
[tex]Height = Iniital\ Height + Growth * x[/tex]
Where x represents the year;
For Type A:
[tex]Height = 120+ 19 * x[/tex]
[tex]Height = 120+ 19x[/tex]
For Type B:
[tex]Height = 48+ 25 * x[/tex]
[tex]Height = 48+ 25x[/tex]
To get when their height will be equal, we simply equate both expressions:
[tex]48+ 25x = 120 + 19x[/tex]
Collect Like Terms
[tex]25x - 19x= 120 - 48[/tex]
[tex]6x= 72[/tex]
Solve for x
[tex]x = 72/6[/tex]
[tex]x = 12[/tex]
Hence, It'll take 12 years
Point-Slope Form: y - y = m (x - x)
Example: point (2,7) and slope = -4
a) Create the Equation
b) Graph the line
Answer:
a) y-7=-4(x-2)
B) I don't know how to put a graph on brainly :/
100 times 90 times 5 plus 5
Answer:100 times 90 times 5 plus 5 is
Step-by-step explanation:45005 plz give brainlyist i Need it
can someone help me
Answer:
its a right angle
Step-by-step explanation:
Right angles have a 90* angle, which is why they add that little square
A plane takes off from an airport and travels at a steady speed of 350 miles per hour. Which of these graphs best represe
the airport, y, after traveling for x hours?
FLIGHT OF AIRPLANE
Answer:
A
Step-by-step explanation:
I found the answer
2) Does the pair of ratios form a proportion? *
3 points
Yes
No
Answer:
e
Step-by-step explanation:
Maddie's office recycled a total of 12 kilograms of paper over 4 weeks. How many weeks will it take Maddie's office to recycle a total of 15 kilograms of paper? Assume the relationship is directly proportional.
What is Jamal weight in kilograms if he weighs 156 pounds? Round to the nearest 10th if necessary
Answer:
70.7604097 in kilograms rounded would be 70.8 kilograms
Step-by-step explanation
Jessica wants to spend less than $50.00 per month on her cell phone bill. Write an inequality that shows how many text messages Jessica must limit herself to in order to keep her monthly bill less than $50.00. Use the symbol for your inequality.
Missing part of question:
Jessica pays a flat rate of $20 for her cell phone and is charged $0.05 for every text she sends.
Answer:
20.00 + 0.05x < 50.00
Step-by-step explanation:
Given
Base Amount = $20
Rate = $0.05 per text
Budget = Less than $50.00
Required
Write an inequality that represents the scenario
Let x represents the number of texts
To solve this, the base amount when added to the amount paid for x text must be LESS THAN Jessica's budget.
Mathematically, we have:
Base Amount + Rate * x < Budget
Substitute values for Base Amount, Rate and Budget, this gives:.
20.00 + 0.05 * x < 50.00
20.00 + 0.05x < 50.00
Hence, the inequality that represents the scenario is 20.00 + 0.05x < 50.00
Solving further for x, we have:
20.00 + 0.05x < 50.00
Collect Like Terms
0.05x < 50.00 - 20.00
0.05x < 30.00
Solve for x
x < 30.00/0.05
x < 600
This means that she must send less than 600 text messages.
Find the geometric mean of 3 and 48.
A car travels 58.8 kilometers in 2.6 hours. What is the car's average speed?
Answer:
22.6 km/hr
Step-by-step explanation:
58.8/2.6=22.6
The car's average speed is 22.6 kilometers
The angle of elevation of top of a tower from a point on the ground, which is 30 m away from the foot of the tower is 30°. The length of the tower is a.√3 m b.2√3 m c.5√3m d.10√3 m
Answer: d
Step-by-step explanation:
Note that the distance to the tower and the height of the tower create a right triangle at the base of the tower. The equation to find the height of a right triangle is to multiply the length times the tangent of angle β.
Given:
b = a · tanβ
tan(30°) = √3/3
Step 1: Solve
b = (30/1) · (√3/3)
b = (30 · √3) / (1 · 3)
b = (30√3) / (3)
b = 10√3
The nth term of an AP is 12-4n. Find the first term and the common difference.
Answer:
first term is 8 and common difference d is -4
Step-by-step explanation:
nth term of an arithmetic sequence is: aₙ=12-4n
First term is putting n=1:
aₙ=12-4n
a₁=12-4(1)
a₁=12-4
a₁=8
So, first term a₁= 8
Now finding second term to find common difference
Second term is: n=2
aₙ=12-4n
a₂=12-4(2)
a₂=12-8
a₂=4
So, second term is: 4
The common difference is: a₂-a₁= 4-8 = -4
So, first term is 8 and common difference d is -4 if nth term is 12-4n
Some one help me pls
Answer:
27
Step-by-step explanation:
PEMDAS : PARENTHESIES, EXPONENTS, MULTIPLY, DIVISIOIN, ADD, SUBTRACT
14/2 + 20
7 +20=27
I NEED HELP ONCE AGAIN PLEASE AND THANK YOU IF CORRECT I WILL MARK BRAINLYEST
Answer:
(5,2)
Step-by-step explanation:
Use the change of base rule to find the logarithm to four decimal places. (2 points) log base nine of 0.877.
Given:
The value is [tex]\log_90.877[/tex].
To find:
The logarithm to four decimal places using the change of base rule.
Solution:
We have,
[tex]\log_90.877[/tex]
Using the change of base rule, we get
[tex]\log_90.877=\dfrac{\log_{10}0.877}{\log_{10}9}[/tex] [tex][\because \log_yx=\dfrac{\log_ax}{\log_ay}][/tex]
[tex]\log_90.877=\dfrac{-0.057000}{0.9542425}[/tex]
[tex]\log_90.877=-0.0597332439081[/tex]
Round the value to the four decimal places.
[tex]\log_90.877\approx -0.0597[/tex]
Therefore, the required value is -0.0597.
Help me plssssss ( Geometry) answer as much as u can in the photo it would be appreciated!!)
Answer:
for 7-12 plot the points on a graph. its the rise/run. from the point farthest to the left, go down or up until you are on the same horizontal line. however many units you moved is the first number. (_/?). then from that point, go to the right until to actually land on the point. however many units you used is your second number. The slope will be in a fraction, and sometimes you can turn it into a whole number.
Step-by-step explanation:
Which list shows all the factor pairs of 72?
A. 1 and 72, 2 and 36, 3 and 24, 4 and 13, 6 and 12, 8 and 9
B. 1 and 72, 2 and 36, 3 and 24, 4 and 18, 6 and 12, 7 and 9
C. 1 and 72, 2 and 36, 3 and 24, 4 and 18, 6 and 12, 8 and 9
D. 1 and 72, 2 and 36, 3 and 24, 6 and 12, 8 and 9
Answer:
The answer is C.
Step-by-step explanation:
The answer is C. because for A. 4 * 13 is 52 not 72. For B. 7 * 9 is not 72 its 63. and D. It does not have 4 and 18.
HELP URGENT I NEED THIS FAST!!!
Answer:
C. 10
Step-by-step explanation:
Answer:
C= 10
Step-by-step explanation:
Please answer fast!!! 45 Points!!!
Which of the following groups of side lengths could form a right triangle?
A. 20 cm, 99 cm, 101 cm
B. 4 cm, 5 cm, 6 cm
C. 25 cm, 50 cm, 75 cm
D. 30 cm, 60 cm, 90 cm
Answer:
D because a right degree angle needs to be 90 degrees
Step-by-step explanation:
Brainliest?
Answer:
it is d because none of the others have 90 degrees (hint a right angle is 90 degrees) hope this helps at all?!
Step-by-step explanation:
SOLVEDDDDDDDDDDDDDDDD!!!!
Answer:
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...........
what is the square root of 36
Answer:
its 6
Step-by-step explanation:
hope it helps......
Divers erected a cage in a shape of an upright cylinder on rhe ocean floor for protection. The diameter of the base measures 32 feet. How much space on the ocean floor does the cage have
Answer:
The cage will cover an area of 805 ft^2 on the Ocean floor
Step-by-step explanation:
To calculate the amount of space the cage has on the Ocean floor, we calculate the area of the base of the cylinder
Mathematically, that will be pi * d^2/4
= 22/7 * (32 * 32)/4
= 22/7 * 256 = 804.5714285714286
The cage will cover an area of 805 ft^2 on the ocean floor
find the power of questions
Answer:
To the 4th power
Step-by-step explanation:
in the formula c=prn, p stands for?
Answer:
Price per item
Step-by-step explanation:
Answer:
Price Per Item
Step-by-step explanation:
Solve for w.
5w/8 = 15
solve step by step with a good explanation.
if you get this correct and solve step by step then i will mark you brainliest!
Answer:
w = 24
Step-by-step explanation:
[tex]\frac{5w}{8}[/tex] = 15
Multiply both sides by 8.
5w = 15 × 8
= 120
Find w.
w = 120 ÷ 5
w = 24
State the slope and y-intercept of y=-2x-5
Answer:
the slope is 2, the y intercept is -5
Step-by-step explanation:
Answer:
the slope is -2
and the y-intercept is -5
Step-by-step explanation:
hope this helps :3
if it did pls mark brainliest