Simplify.

–abc + 7abc – 3bc – 8abc

abc −

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years