Amotorboat heads upstream on a river that has a current of 3 miles per hour. the trip upstream takes 5 hours, and the return trip takes 2.5 hours. what is the speed of the motorboat? (assume that the motorboat maintains a constant speed relative to the water.)

Find the sum of the first 8 terms of the following sequence. round to the nearest hundredth if necessary.

Adriana sold 50 shares of a company’s stock through a broker. the price per share on that day was $22.98. the broker charged her a 0.75% commission. what was adriana’s real return after deducting the broker’s commission? a. $8.62 b. $229.80 c. $1,140.38 d. $1,149.00

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 : )