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

Answer:

$\ 30$

Step-by-step 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

$(2)\ 15=\ 30$