Could someone help me out with this math question

43lbs of tomatos cost $387. how much would 41lbs cost

Explain how you can use the associative property to evaluate (7x50)x4.

Talia grouped the terms and factored out the gcf of the groups of the polynomial 15x2 – 3x – 20x + 4. her work is shown below. (15x2 – 3x) + (–20x + 4) 3x(5x – 1) + 4(–5x + 1) talia noticed that she does not have a common factor. what should she do?