What multiplies to be -100 and adds up to be -21

Y=4x^2+x-1 solve using quadratic formula

1: 4 if the wew 35 surfboards at the beach how many were short boards?

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders