Is this correct, my teacher graded it and i think it is correct

i think it is c hope that

the answer to this is a. a^2 + b^2 = c^2

emily solved for a part when she should have solved for the whole. 875,000 should be the numerator of the equivalent ratio. 70 x 12,500 is 875,000. so the answer is 100 x 12,500 which is 1,250,000.