What is that value cosine of angle x to the neared hundredths

Need on this one asap im almost done with this subject

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

What sums are equal to 6/12? choose all answers that are correct a.6/12+6/12+6/12+6/12+6/12+6/12 b.2/12+1/12+1/12+2/12 c.5/12+1/12 d.1/12+1/12+1/12+3/12 plz : )