At a skateboard shop: The store buys a helmet for $19.00 and sells it for $31.50. What percentage was the markup? A. 63.4%
B. 64.8%
C. 65.8%
D. 66.8%

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Ten members of balin's soccer team ran warm ups for practice. each member ran the same distance. their combined distance was 5/6 of a mile. to find the distance that each member ran, balin wrote the expression below.