Ok with a) reverse 4 x 10^-180 into positive.

b) whats 376 plus 236= 612 and then you just add the powers.

c) if you can find the sqrt of 4 x 10^112 then you have your answer.

d) (5/2) also means: 5 means to the power of and the 2 means sqrt of. so add the power of 5 and sqrt the answer same as c).

Hope that helps.