Amotorboat covers the distance from one pier to the other pier in 4 hours and the way back in 5 hours. what is the speed of the boat in still water, if it covers 70 km with the current in 3.5 hours? plz show work and do not estimate

Most animals give birth during a general time of year. this is because animals naturally breed so that their young will be born at the time of year when there will be adequate food supply. the bar graph shows the number of live births of a jackrabbit native to california over the course of year x. based on the data, which of the following would be an appropriate conclusion? a) in general, rabbits give birth during the spring months b) in general, rabbits give birth during the summer months c) in general, m california jackrabbits give birth during the spring months d) in general, california jackrabbits give birth during the summer months

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Given the expression (7 ? 4i) ? (2 + 6i), perform the indicated operation and write the answer in the form a + bi.