janelle can get a 24 pack of bottled water for $6.80 how much would janelle have to pay for a 12 pack of bottled water f the ratios are proportional?

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?

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

Use sigma notation to represent the following series for 9 terms.