Which pair of angle measures satisfy the condition sin j = cos k?

What is the value of the expression below? (81^2)^1/8

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0