What is the measure of ∠C?

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction

Nellie is analyzing a quadratic function f(x) and a linear function g(x). will they intersect? f(x) g(x) graph of the function f of x equals one half times x squared, plus 2 x g(x) 1 5 2 10 3 15

Answer asap! urgent! will give brainliest!