Find the product of 27x60 then explain how you would use mental math to find the product of 27x600

Z4=289 there should be 4 answers total 2 whole numbers and either 2square root or imaginary number answers

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.

How many and of which kind of roots does the equation f(x)=2x^4−9x^3+17x^2−16x+6 have?