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Kipish [7]
3 years ago
12

Nancy is 5 years younger than her brother Stan. Last year she was twice as young as he was. How old is each of them now?

Mathematics
2 answers:
otez555 [7]3 years ago
4 0
Nancy: 5 Stan: 10

5 is 5 years
younger then Stan
And 5 is twice as
young as 10
Svetllana [295]3 years ago
4 0

Answer:

Nancy is 6 years old and Stan is 11 years old now.

Step-by-step explanation:

Let the present age of Stan be x.

Then age of Nancy = y

x - y = 5

Last year she was twice as young as he was

Age of Nancy last year = y-1

Age of Stan last year = x-1

2 × (y-1)= x-1

2y -2 = 5 + y -1

y = 6

x = y + 5 = 6 + 5 = 11

Nancy is 6 years old and Stan is 11 years old now.

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Considering the definition of exponential function, the value of the car is 11,287.25 dollars.

<h3>What is exponential function</h3>

An exponential function is one in which the independent variable x appears in the exponent and has a constant a as its base. Its expression is:

f(x)= aˣ

Being a a positive real, a > 0, and different from 1, a ≠ 1.

When 0 < a < 1, then the exponential function is a decreasing function and when a > 1, it is an increasing function.

<h3>What is the price of the car</h3>

In this case, the value of that car depreciates based on the function f(t)=12,000×0.96^{t} where t is measured in years after purchase.

After 3/2 years, the value of the car is calculated as:

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Solving:

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Finally, the value of the car is 11,287.25 dollars.

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