Find the missing value. cos(x) =7/14

Which shows one way to determine the factors of  x3  +  5x2  –  6x  –  30 by grouping? x(x2  –  5)  +  6(x2  –  5)x(x2  +  5)  –  6(x2  +  5)x2(x  –  5)  +  6(x  –  5)x2(x  +  5)  –  6(x  +  5)

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

Aline passes through 3,7 and 6,9 what equation represents the line