Your sister has a child, how much do you need to invest now, so that the child has $20,000 by age18, ifthe Certificate of deposit pays 4.5% compounded every moth?

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

Can some one me with these questions

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z