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Hi Jamie,
1. Both fractions are fairly close to 1, so the the problem becomes, approximately, 1 + 1 = 2
2. The first fraction is just under 1 and the second fraction is just under 1/2, so the problem becomes, approximately, 1 - 1/2 which is 1/2.
3...

7 - 4 = 3
There are 3/7 of the bananas left.
Hope this helps, Ashley.
Mary Ann

Perimeter = 2L + 2W
x = Width
x + 10 = length
100 = 2(x) + 2(x + 10)
Simplify.
100 = 2x + 2x + 20
100 = 4x + 20
Subtract 20
80 = 4x
4x = 80
Divide by 4
x = 20 = Width
x + 10 = 30 = Length
Hope it helps,...