Would appreciate help on this.

What are correct trigonometric ratios that could be used to determine the length of ln

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 8 = -6x a. –7.12, 1.12 b. 7.12, –1.12 c. 7.12, 1.12 d. –7.12, –1.12