Atotal of $21,000 is invested in two bonds that pay 4% and 7.5% simple interest. the bond with 7.5 % interest rate earned 6 times as much interest. as the bond with a 4 % interest. rate. how much is invested in each bond? what was the total interest earned?

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

What is the circumference of a circle with an area of 50.24 cm²?

Which strategy is used by public health to reduce the incidence of food poisoning?