a limited-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.)
which option?
y = 18(1.15)x
y = 18(0.15)x
y = 20.7(1.15)x
y = 20.7(0.15)x

Equation used to find the value, y, after x years is y = 18(1.15)^x, Option A is correct.

Step-by-step explanation:

Initial value of poster = $ 18

After 1 year amount of increase = $ 20.70

Rate = 15% = 0.15

Which equation can be used to find the value, y, after x years?

Future Value = y

Years = x

y = 18(1.15)^x

is the correct answer.

After 1 year the price is $20.7

Checking by putting in equation

y = 18(1.15)^1

y = 20.7

Equation used to find the value, y, after x years is y = 18(1.15)^x

So, Option A is correct.

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: