It takes Sara 5 1/2 hours to drive to her aunt's house. She has already driven 3 1/2 hours.
Which of the following equations can be
used to find the amount of time she has left
to drive, x?
a) x - 3 1/2= 5 1/2
b) x + 3 1/2 = 5 1/2
c) X - 5 1/2= 3 1/2
d) x + 5 1/2 = 3 1/2

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)