The area of the following equilateral triangle is 62.4 square feet? what is its height? all the sides are 12 ft. a) 10.4 ft b) 12 ft c) 5.2 ft d) 2.6 ft

What does x = in this equation x+3+2x=x+5

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.