Alimited edition poster increases in value each year with an initial value of $18. after 1 year and an increase of 15% per
year, the poster is worth $20.70. which equation can be used to find the value, y, after x years? (round money values to
the nearest penny)

Step-by-step explanation:

we know that

The equation of a exponential growth function is equal to

where

y ---> the value of the poster

x ---> the number of years

r ---> is the growth rate of change

a ---> is the initial value

In this problem we have

substitute

therefore

Examples

For x=5 years

For x=8 years

For x=10 years

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls