Question

Shawna and her best friend Keisha go shopping. The function p(t) = 3x +2x-4x2+ 21 represents how much money each girl spent based on the number of hours they were shopping. If Shawna and Keisha each go shopping for 2 hours, how much money did they spend together?

Answer 1

`\$30`

Explanation:

we have

`p(t)=3x+2x-4x^(2)+21`

Find the amount of money that each girl spent

For t= 2 hours

`p(2)=3(2)+2(2)-4(2)^(2)+21`

`p(2)=10-16+21`

`p(2)=\$15`

Find the amount of money that they spend together

Multiply by 2 the amount of money that each girl spent

`(2)\$15=\$30`