An engineer invested $10,000 in a six-month savings certificate that paid a simple annual interest rate of 12%. After six months, she invested the total value of her investment in another six-month certificate. After six more months, the investment was worth $11,130. If the annual interest rate of the second certificate is r%, then what is r?

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

Explain how you can use the associative property to evaluate (7x50)x4.

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.