3 years ago

Is the function y = 3(2)x is an example of exponential growth or decay?

1 answer:

7 0

Answer: exponential growth

Explanation: Your original formula is a(b)^x.
If b < 0 that’s exponential decay.
If b > 0 that’s exponential growth.

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John’s father is 5 times older than John and John is twice as old as his sister Alice. In two years time, the sum of their ages

oksano4ka [1.4K]

Answer:

John’s age is 8 years

Step-by-step explanation:

Let

x -----> John’s father's age

y -----> John’s age

z -----> John’s sister's age

we know that

$x=5y$ -----> equation A

$y=2z$

$z=y/2$ -----> equation B

$(x+2)+(y+2)+(z+2)=58$

$x+y+z+6=58$

$x+y+z=52$ -----> equation C

Substitute equation A and equation B in equation C and solve for y

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Multiply by 2 both sides to remove the fraction

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$y=8$

Find the value of x

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Find the value of z

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therefore

John’s father's age is 40 years

John’s age is 8 years

John’s sister's age is 4 years

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