Choose 2 answers:
A. 3.8⋅tan(40°)
B. 3.8⋅tan(50°)
C. 3.8/tan(40°)
D. 3.8/tan(50°)

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 is the number 321,000,000 in scientific notation? also what is the number? ?

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?