Using the protractor, find the angle measure.

( explain! )

(a) 60°

(b) 75°

(c) 85°

(d) 90°

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles. i'm desperate.

Tan198=asin164=? how to solve this? ?

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.