Aheated piece of metal cools according to the function c(x) = (.5)^x − 11, where x is measured in hours. a device is added that aids in cooling according to the function h(x) = −x − 3. what will be the temperature of the metal after five hours?

a. -8 degrees celsius
b. 26 degrees celsius
c. 32 degrees celsius
d. 56 degrees celsius

How do you do this geometry problem

The tuition costs, c, for a local community college are modeled by c(h) = 250 + 200h, where h represents the number of credit hours taken. the local state university has tuition costs, s, modeled by the function s(h) = 300 + 180h. how many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?