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Answer:
B. 14 m sq.
Step-by-step explanation:
Area for a triangle
A = W times H times 1/2
4 times 7 = 28
28/2 = 14
Total number of sheets are 12.
Total number of white sheets= 9
Total number of red sheets = 3
Probability = Number of favorable outcomes/ total number of outcomes.
Hence
When Calvin throws the sheets in the air, the probability that he gets a white sheet is

which equals to 
that becomes 0.75
Answer is B
area for a trapezoid is [( Base 1 + Base 2 ) * height] /2
which in this case would be [( 7 + 10 ) * 7]/2
(17)7/2
59.5
Answer: B
If you multiply equation 1 by -5 you get: -10x-y=3.
If you multiply equation 2 by 2 you get: 10x+4y=14
Add the systems together to eliminate x.