Use the elimination method to solve the ststem of equations. choose the correct ordered pair 10x+2y=22 3x-4y=-21

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

15 point ! ~ see if you know the answer to both you!

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 3, 4+2i, 1+(sqrt)7 the answer is supposed to be: f(x)=x(^5)-13x(^4)+60x(^3)-82x(^2)-144x+360 what am i doing wrong?