Writing Functions Review

 $b\left(x\right)\cdot a\left(x\right)$  

•  $7x^2-7$  

•  $7x-7$  

•  $-60x^2+35x$  

•  $-60x+35$  

 $c\left(2x\right)-4d\left(x\right)$  

•  $4x^2+40x-24$  

•  $4x^2-16x+8$  

•  $-16x^2+40x-12$  

•  $-16x^2-16x-12$  

 $-4e\left(x\right)-d\left(x\right)$  

•  $-7x^2+7x+8$  

•  $-9x^2-7x-16$  

•  $7x^2-7x-16$  

•  $9x^2+7x+8$  

 $-2c\left(x\right)-e\left(-3x\right)$  

•  $36x^2-12x-19$  

•  $18x^2-12x-13$  

•  $-36x^2-12x+13$  

•  $-18x^2-12x+19$  

A company manufactures headphones. The headphone are sold for $125 each. The company's revenue can be modeled by function:

 $r\left(x\right)=125x$ . The cost to manufacture the headphones can be modeled by the function:  $c\left(x\right)=35x+500$ .

Write a function p(x) that represents the company's profit.

•  $p\left(x\right)=160x+500$  

•  $p\left(x\right)=160x-500$  

•  $p\left(x\right)=90x+500$  

•  $p\left(x\right)=90x-500$  

For questions 6 & 7:

Kelsey sells phones at Verizon Wireless. She earns a fixed wage of $780 per week plus a 8% commission on her total weekly sales, s.

Write a function that can be used to find Kelsey's total weekly earnings, w(s).

• $w\left(s\right)=780+0.08s$

• $w\left(s\right)=780+0.8s$

• $w\left(s\right)=780s+0.8$

• $w\left(s\right)=780s+0.08$

For questions 6 & 7:

Kelsey sells phones at Verizon Wireless. She earns a fixed wage of $780 per week plus a 8% commission on her total weekly sales, s.

How much money would Kelsey earn if she sold $5762?

• $5389.60

• $5824.40

• $1240.96

• $1178.56

Write a explicit formula for the following function.

• $f\left(t\right)=-3x-4$

• $f\left(t\right)=-4x-3$

• $f\left(t\right)=4x-7$

• $f\left(t\right)=-7x+4$

Write a explicit formula for the following function.

• $f\left(t\right)=24x-5$

• $f\left(t\right)=-5x+24$

• $f\left(t\right)=19x+5$

• $f\left(t\right)=5x+19$

Write a explicit formula for the following function.

•  $f\left(t\right)=8\left(\frac{2}{3}\right)^t$ 

•  $f\left(t\right)=8\left(\frac{3}{2}\right)^t$ 

•  $f\left(t\right)=\frac{3}{2}\left(8\right)^t$ 

•  $f\left(t\right)=\frac{2}{3}\left(8\right)^t$