Answer:
The first two is x=60
Step-by-step explanation:
1.5/90 = 1/x
1.5x = 90 x 1
1.5x/1.5 = 90/1.5
x = 60
3 different pairs are...
0+1=1
-1+2=1
-2+3=1
Answer:
distribute,
Step-by-step explanation:
8+12+1 3/5x=-12
20+1 3/5x=-12
1 3/5x=8
x=5
By the law of cosines, the angle

satisfies

which reduces to

which converts to approximately 77 degrees (this can be done my multiplying by 180 and dividing by pi).