Answer:
A
Step-by-step explanation:
Using the cosine ratio in the right triangle
cosA =
=
=
, thus
A =
(
) ≈ 48° → A
Answer:
14
Step-by-step explanation:
f(-2) = 3(-2)² + 1 = 3(4) + 1 = 12 + 1 = 13
Answer:
1.48
Step-by-step explanation:
my calculator said sqrt(2.2)=1.48
Answer: 0, 1.7
Step-by-step explanation:
You made a mistake in your second line.
You put

in brackets, dividing the

by 3, but you didn't divide the 18x by 3.
So you ended up with 3 times 18x in the end.
You should divide the 18x by 3 too, so you end up with