The cost c(x) (in $1000) for a city to remove x% of the waste from a polluted river is given by
a. determine the cost to remove 20%, 40%, and 90% of the waste. round to the nearest thousand dollars.
b. if the city has $320,000 budgeted for river cleanup, what percentage of the waste can be removed?

Avegetable garden and a surrounding path are shaped like a square together are 12 ft wide. the path is 1 feet wide. if one bag of gravel covers 8 square feet, how manu bags are needed to cover the path? round your answers to the nearest tenth.

1foot = 12 inches; 1 yard = 3 feet

Kayla and alberto are selling fruit for a school fundraiser. customers can buy small boxes of grapefruit and large boxes of grapefruit. kayla sold 3 small boxes of grapefruit and 1 large box of grapefruit for a total of $65. alberto sold 1 small box of grapefruit and 1 large box of grapefruit for a total of $55. what is the cost each of one small box of grapefruit and one large box of grapefruit?