Picking two numbers from 1 through 10 and getting a multiple of 3 both times

Solve the triangle. a = 21°, c = 105°, c = 5

What is the perimeter of an equilateral triangle if each side is (x+3)?

A)a square brown tarp has a square green patch green in the corner the side length of the tarp is (x + 8) and the side length of the patch is x what is the area of the brown part of the tarpb)a square red placemat has a gold square in the corner the side length of the gold square is (x - 2) inches with the width of the red region is 4 in what is the area of the red part of the placemat