Given that a = 7 cm and b = 4.2 cm, work out the perimeter of the triangle. Give your answer rounded to 1 DP.

What is the number 321,000,000 in scientific notation? also what is the number? ?

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?

Af jewelry box is in the shape of a rectangular prism with an area of 528 cube inches. the length of the box is 12 inches and the height is 5 1/2 inches. what is the width of the jewelry box