Algebra ! show steps. no decimal answers, except on three. (note; ^ is symbol for exponent)

simplify;
(-2x^3y^4)(5x^9y^-2)

simplify. write answer in scientific notation.
8(32 x 10^11)

multiply.
(3x – 1)(5x + 4)

factor.
8x^2 + 2x - 3

Iam so stuck. what is the worked out answer for this question?

On a piece of paper graft y+2> -3x-3 then determine which answer matches the graph you drew

Suppose you are an avid reader and are looking to save money on the cost of books instead of paying about $20 for each book, you decide to look into purchasing a kindle for $120 you can purchase e-books for about $5 each 1. find the slope-intercept equation for the cost of the hard copy of books using x to represent the number of books 2. find the slope-intercept equation for the cost of the kindle with cost of e-books using x to represent the number of books