Set up a proportion. take 3/6 = 20/x
Cross multiply 3 * x = 6 * 20
Simplify 3x = 120
Divide by 3 x = 40
So the denominator of the bottom fraction is 40
Step-by-step explanation:
area of a circle
A = pi x r^2
r=9
Answer:
Defining variable: x = per week
Equation: 37 + 6.5x = 9 + 8.25x
Answer: 16 weeks
Step-by-step explanation:
x = per week
Jack:
37 + 6.5x
Diane:
9 + 8.25x
Equation:
37 + 6.5x = 9 + 8.25x
-1.75x = -28
x = 16
Answer:
With monthly compounding, the bank will calculate interest on your account just once per month. It will not update your balance on a daily basis when it calculates how much interest it owes you. Assuming that the APR is the same, accounts with monthly compounding offer a lower APY than accounts with daily compounding.
Here is the equation:
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⇒
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You need to get "x" by itself so minus 3 from each side
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⇒

⇒
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Divide 8 by 2

÷

x=4
So each 4 is equivalent to 4
Lets check:

⇒
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⇒

So that means that Marcus practiced the piano for 4 hours and Donnel practiced for 7