Someone help me answer these two questions.

What is the measure of angle z in this figure? enter your answer in the box. z = ° two intersection lines. all four angles formed by the intersecting lines are labeled. clockwise, the angles are labeled 43 degrees, x degrees, y degrees, and z degrees.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

If f(x) = 6x – 4, what is f(x) when x = 8? a2 b16 c44 d52