Find (2b^2+3b--4b-9)
answers
7b-14
4b^2+4
7b+4
4b^2-b-14

Aheated 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 two hours?

What kind of bond pays interest which is exempt from tax?

Anyone know? is appreciated! will mark brainliest if correct!