On the calculator is says 15.52 and that’s the answer i need but when i did my work it said 16.52

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

The sum of two numbers is 12 and their difference is 18 what are the two numbers

If f(x) = 4x – 3 and g(x) = 8x + 2, find each function value a.f[g(3)] b.g[f(5)] c.g{f[g(-4)]}