Answer:

Step-by-step explanation:
First, subtract by 7 both sides of equation.

Solve.


Then, divide by 12 both sides of equation.

Solve to find the answer.

, which is our answer.
The answer is x=3
if you divide each by -7 to isolate x, it’s equal to positive three because 2 negatives make a positive
Answer:
Step-by-step explanation:
B
Answer:
28 m
Step-by-step explanation:
The longer side can be found using the Law of Cosines. The semi-diagonals are of length 12 and 20 m, and the angle between them facing the long side is 180° -60° = 120°.
c^2 = a^2 +b^2 -2ab·cos(C)
c^2 = 12^2 +20^2 -2·12·20·cos(120°) = 144 +400 +240 = 784
c = √784 = 28
The longer side is 28 meters.