I like to reduce everything by half if I don't already know the answer.

It just so happens that is the reduced fraction.
All I did was halve 18, which is 9, and halve 34, which is 17.
Answer:
Add 5 for the first one
The 2nd one is 25 and k or 25 thousand.
Step-by-step explanation:
add 5 for the first one because 5 + 5 = 10
9 + 5 = 14 . and 13 + 5 = 18.
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For the 2nd one: 25k means 25 thousand or the Product of 25 and k.
Answer:
C
Step-by-step explanation:
In the attached file
Answer:
A
Step-by-step explanation:
Using the cosine ratio in the right triangle
cosA =
=
=
, thus
A =
(
) ≈ 48° → A