Please answer soon: Simplify these expressions. Then, evaluate them for the given value of the variable. 3x+7x−28+31−8x for x=2043

The simplified expression would be

The value is

Atriangle has an area of 72 square inches. if the base of the triangle has a length of 18 inches, what is the height of the triangle? use the formula for the area of a triangle: area = (base)(height) type a numerical answer in the space provided. do not include the units or spaces in your answer.

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

Which one is true about the hexagons ?