Question

324=1409-1400cos(x) What’s x equal ?

Answer 1

Answer:

x ≈ 39.2°

Step-by-step explanation:

Given

324 = 1409 - 1400 cos x ( subtract 1409 from both sides )

-1085 = - 1400 cos x ( divide both sides by - 1400 )

0.775  = cos x, thus

x = $cos^{-1}$ (0.775) ≈ 39.2° ( to 1 dec. place )