My question is a complex numbers question: square root -6 times square root -24 the answer is -12, but I don't know how to solve it

Let r = 3. what is the value of r + 58?

What situation is an example of an observational study

Scott harris can invest $7,000 in a 1-year cd that earns interest at an annual rate of 4 percent compounded monthly. the amount per $1.00 is 1.040742. he can also invest $7,000 in a 1-year cd at annual rate of 4 percent compounded quarterly. the amount per $1.00 is 1.040604. what is the difference in the amount of interest earned for each investment? a) $0.96 b) $0.81 c) $0.87 d) $0.88