Answer:
G. 4/7
Step-by-step explanation:
They both equal to -4 using that value
a)
Cos60=1/2=0.5
b)
cos60=4/x
0.5=4/x
0.5x=4
0.5x/0.5=4/0.5
x=8
the answer is 49
2+4n, 3-7n, 9-12n is your answer
Hope this helps!