William had $78.12 in his savings account. after making a deposit which equation is true ? a. 78.12-d=$114.08 b.$114+d=$78.12 c.78.12+114.08=d d.114.08-d=$78.12

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.

If the diameter is 8 than the radius is 4 because 2r or 2*radius equals the diameter. 4*2=8. 8/2=4.