We are given the sides of an equilateral triangle of 10 inches length of the sides and 7 inches as the height of the triangle. The area of the triangle is 0.5*b*h equal to 35 square inches. The answer is 35 square inches in this problem.
5(2x+3) by adding them you get this equation.
Ok so you do 3x7= 21 which you already know. So then you do 1x7=7. Last, you just add 21+7=28 pens in total
