With explanation Answer for brainliest
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Step-by-step explanation:

1.) ans is 68 inches squared

the working is : l×w×2=6×1×2=12

l×h×2=6×4×2=48]-add =68 inches squared. w×h×2=1×4×2=8

3). ans is 220 millimeters squared

the working is: l×w×2=10×4×2=80

l×h×2=10×5×2=100]-add = 220 millimeters squared.

w×h×2=4×5×2=40

5). ans is 37ft squared

working: l×w×2=7×2×2=28

l×h×2=7×2×1/2=7]add=37ft squared

w ×h×2=2×1/2×2=2

7). ans is 48 metres squared

working: l×w×2=2×2×2=8

l×h×2=2×5×2=20 add them =48 metres squared.

w×h×2=2×5×2=20

829 feet per second is your answer. You do this by doing 9,944in/s x ft./12in. Cancel out the in., and multiply to get 9,944ft in 12 seconds. Divide 9,944 by 12 to get around 828.6 ft., and then then round it up to get 829 ft. per second.