Question

MEDAL WILL BE REWARD!! PLEASE HELP!
1) write the area of trapezoid in terms a and b /Users/chloeschonig/Desktop/4fc5ac84e4b022f1e12d44c1-jessamazzing-1338354834685-7.png
A) (1/2)(a+b)^2
B) (a+b)/2+ab
C) (1/2)(a-b)(a+b)
D) (a^2+b^2)/2

2)You can now set the area of the trapezoid equal to the sum of the areas of the three triangles. Which of the following are steps that occur in simplifying the equality?
A) a^2+2ab+b^2=2ab+c^2
a^2+b^2=c^2

B) a^2+b^2=2ab+c^2
a^2+b^2-2ab=c^2

C) a^2-2ab+b^2=c^2
a^2-b^2=c^2+2ab

D) (a+b)(a-b)=2ab+c^2
a^2-b^2=c^2