A heated piece of metal cools according to the function c(x) = (.5)x − 9, 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 five hours?

Question

ikram002p · Answer

well temperature = ffunction of cools + added device of cooling
temperature =g(x) +h(x)

anonymous · Answer

Oh, ok. So the way to solve this question would be [(.5)x-9] + [-x-2]?

ikram002p · Answer

we dnt solve it , just see the tempreture when x=5

anonymous · Answer

By doing that I got the answer of $$-\frac{ 1 }{ 2 }x-11$$

Though my answer choices are:
-7 Celsius
6 Celsius
9 Celsius
or 16 Celsius

I've been trying to figure out how to solve this question for an hour now but I'm truly not sure what to do.

anonymous · Answer

Oh ok, by putting x=5 into the equation, I got -13.5.

ikram002p · Answer

[(.5)x-9] + [-x-2] 
 [(.5)5-9] + [-5-2]=-13.5
correct

anonymous · Answer

Okay. What should I do next now that I have -13.5?

ikram002p · Answer

nothing its the answer :D

anonymous · Answer

AH! I wrote the question in wrong! In reality, the equation would be [(.5)^x-9]+[-x-2]. By putting in x=5, I end up getting 9, which is one of my answers. Thank you very much for your help and sorry for the confusion!

ikram002p · Answer

no its ok :D
good luck