Mr. carter drove 638 miles the first weekend. he drove 243 miles the second weekend.

about how much further did mr. carter drive the first weekend than the second weekend?
(give your answer to the nearest 100 miles.)

What is the slope of the line that contains the points (4,8) and (9,8)? what type of line is it?

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

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?