Which equation represent a relationship where y is a nonlinear function of x? Select all that apply

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

What is the explicit formula for this sequence? -7, -4, -1, 2, a.) an = 8 + (b - 1)3 b.) an = -7 + (n - 1)3 c.) an = 3 + (n -1) (-7) d.) an = -7 + (n - )