Anyone know . please tell me

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two