Quantitative Methods Answers

Hello ,
Do you solve discrete Math ( mathematics for computing )
?? Like proofs containing p and q
?

Do the following sums by hand in IEEE double precision computer arithmetic, using the rounding to nearest rule: a) (1+(2^-51+2^-52+2^-54))-1, b) (1+(2^-51+2^-52+2^-60))-1

I have cryptography homework that I need help with. various problem such as:To prove that a symmetric encryption scheme (KG, E, D) satisfies a security notion, etc.