Answer:
40
Step-by-step explanation:
Use the geometric mean for right triangles here. Like this

. Cross multiply to get

, and

. That simplifies down to

. Pull out the 9 as a perfect square of 3 and you're left with

, first choice above.
The correct answer is letter C
Answer:
C. -4x - 1
Step-by-step explanation:

Distribute the term outside of the parenthesis, Multiply each term in the parenthesis by the term outside (do not forget to include the negative sign when multiplying);

Simplify,

5,000
is 300 closer to 100 or 1000?
or
is 3 closer to 1 or 10?