Which equation is the inverse of 5y+4 = (x+3)^2 + 1/2?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Isuck at math ; ^; m a student solved this problem and said the answer is 3 feet. chase had a roll of ribbon that contained 7 7/8  feet of ribbon. he cut off one piece that was 3 5/8  feet long and another piece that was 1 1/4  feet from the roll. how much ribbon was left on the roll? is the student's answer reasonable? yes, the answer is reasonable. no, the answer is not reasonable. it should be about 2 feet. no, the answer is not reasonable. it should be about 13 feet. no, the answer is not reasonable. it should be about 4 feet.

Can someone me with the property questions for 12 13 and 14 plz