Question

Multiple choice help please.

I think 10. is B but I'm not sure about 11 and 12.

Answer 1

10 is not B

Answer 2

It's not? Where did I go wrong?

Answer 3

for #11 just simplify both sides of the = sign. if you end up with a statement that is always true, then that's an identity.

Answer 4

for #10:
\(\large -9=\frac{5}{17}n \)
\(\large -9 \cdot \frac{17}{5}=\frac{5}{17}n \cdot \frac{17}{5} \) isolate the n....
= ????