If there are 16 ounces in a pound, and 8 ounces costs $8, The best answer would be D. $16 per pound
F(-1) = 12 - 5(-1)
f(-1) = 12 + 5
Solution: f(-1) = 17
Answer: look at the screenshot
Step-by-step explanation:
it has everything you need
The first is a. you can rewrite it

the second is d. the only common factor between 20 and 40 that can be taken out is the 4 which becomes a 2, but inside the square roots there is still a 5 and 10, which cannot be combined
the third is c.

the fourth is d.
add 3 to both sides

then square both sides

then divide both sides by 2, x=50