The area of a square piece of cardboard is 81 square inches. what is the length of the cardboard?

a. 8 inches
b. 9 inches
c. 20.25 inches
d. 10 inches

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

Dexter read 11 science fiction books and 5 history books. lena read 9 science fiction books and 4 history books. compare the students’ ratios of science fiction books to history books. 1. determine the ratios’ form:    science fiction books to history books 2. write the ratios as fractions:    dexter: 115; lena: 94 3. rewrite with a common denominator. 4. compare. 5. answer the question. determine which shows the correct comparison of the ratios for this problem.

Alex measured the length of an item to be 3.7 cm. the actual length is 3.5 cm. what is alex’s percent error?