Her check register will have a surplus of 64 dollars compared to her actual balance.
example
100 +32 = 132 (incorrect)
100 -32 = 68 (correct)
132 -68 = 64 surplus
To find the mean you add up all the numbers then divide the answer by the amount of numbers there are
in this case we add 28+ 18+ 19+ 18+ 17 then divide by 5
THE MEAN IS 20!!!
-HAVE A NICE DAY!!!
I think you got to multiply the numbers hopefully I helped
X/5 - 11 = -13
x/5 - 11 (+11) = -13 (+11)
x/5 = -2
x/5 (5) = -2(5)
x = -10
-10 is your number
hope this helps
