HELP PLEASE ITS A TEST

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

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

Which values of p and q result in an equation with exactly one solution? px-43=-42x+q choose all answers that apply: a) p=-43 and q=-43 b) p=42 and q=43 c) p=43 and q=−42 d) p=42 and q=42