Z=82 vertical or opposite angle theorem
15x-7 + 82=180 supplementary angles theorem
so 15x +75 =180
15x=180-75
x=105/15
x=7
The answer is D because you can multiply the second equation by -4
X(.07 )+x = 14.70
x = 13.73831775
Use the sequence formula and the answer will be 981,090.