Aman travels for 6 hours at a rate of 50 miles per hour. his return trip takes him 7 1/2 hours. what is his average speed for the whole trip?

Multiply 6 hours times the rate of 50 miles per hour to get the total miles he traveled there. Which it was 300 miles to get there. It must have taken 300 miles to get back also. So divide distance (300) by time (7.5) to get 40 mph was the speed coming back. Now find the average of the two speeds ( 50+40=90 divded by 2) THE ANSWER IS 45 MPH FOR THE AVERAGE SPEED! (:

The best answer, assuming d is the deposit,  is    d.114.08-d=$78.12the deposit is always a positive amount because deposit means you're adding into the account. we're assuming that $114.08 is the final amount of the account.choice d makes the most sense:     (d)  114.08-d=$78.12subtracting the deposit by the final amount leads to the initial amount.it also makes the most sense if we rearrange it by adding d to both sides. this cancels the "d" on the left side of the equation to give    114.08 = 78.12 + dwhich we can see is adding a deposit, d, to the initial amount in the account.we can rule out choice a which says      (a) 78.12-d=$114.08this equation makes no sense. because deposit is a positive number, subtracting the initial balance  by the deposit should not lead to an increase in the account.we can rule out choice b, which says    (b) $114+d=$78.12if we subtract d from both sides, we end up with      $114 = $78.12 - dwhich is the same contradiction from before.we can rule out choice c which says    (c) 78.12+114.08=dthe current amount plus something else does not equal deposit.