Afather and son are digging a garden that is 7 feet long and 5 feet wide. the father, working alone, can dig the garden in 3 hours. the son can do the job in 4 hours. if they both work together, how long would the two need to complete the task? (round your answer to the nearest tenth.)

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

The measure of an angle is 117°. what is the measure of a supplementary angle?

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )