PLEASE HELP ME

Given an isosceles triangle with legs measuring 10 inches and base measuring 18 inches, what is the cosine of one of the base angles?

A.0.900
B.0.555
C.0.316
D.0.100
E.1.800

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

If you double the input of a function and it results in half the output, and if you triple the input and it results in a third of the output, what can be guessed about the function? check all that apply.

The base of a solid right pyramid is a square with an edge length of n units. the height of the pyramid is n - 1 units. sia (n-1 n