True or false ? in the body of an indirect, proof you must show that the assumption leads to a contradiction

Asquare is dilated by a scale factor of 1.25 to create a new square. how does the area of the new square compare with the area of the original square? a)the area of the new square is 1.25 times the area of the original square. b)the area of the new square is 2.50 times the area of the original square. c)the area of the new square is 1.252 times the area of the original square. d)the area of the new square is 1.253 times the area of the original square.

Find the multiplicative inverse of 8-12i

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.