Simplify -2(x + 4)^2 – 3 + 5x

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

According to the data set, where should the upper quartile line of the box plot be placed?

Find the percent error of the measurement 4 cm