Find the average of the numbers 323, 429, 2718, and 956. Write the solution as a mixed number or a fraction in lowest terms.

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

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

Solve this 364x-64x=300x and 12(x2–x–1)+13(x2–x–1)=25(x2–x–1)