2 multiple choice questions?! math :(( 10 POINTS!!!! URGENT?

[匿名]

2016-02-12 3:14 pm

1. A new video game is expected to sell 130 copies the first hour at a local game store. After that, the sales will follow the function s(x) = 9(x − 1) where x is the number of hours. What is the function that shows total sales, including the first hour?

A) s(x) = 130 + 9(x − 1)
B) s(x) = 9(x − 1) − 130
C) s(x) = 130x − 9
D) s(x) = 130 − 9(x − 1)

2. A heated piece of metal cools according to the function c(x) = (.5)x − 7, where x is measured in hours. A device is added that aids in cooling according to the function h(x) = −x − 2. What will be the temperature of the metal after 2 hours?

−4° Celsius
28° Celsius
32° Celsius
38° Celsius

Thank u 10 points!

回答 (1)

Randy P

2016-02-12 3:16 pm

1. s(x) is the sales after the first hour.
130 is the sales in the first hour.
"Total" means "add"

2. I interpret that as adding the functions c(x) and h(x) and plugging in 2 for x.

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