Algebra
posted by mysterychicken on .
Need help with these please
2. A long distance phone company has a monthly fee of $7.95 and charges a rate of $0.05 per minute. Another long distance company has a monthly fee of $9.95 and charges a rate of $0.03 per minute. At how many minutes would the two companies have equal charges?
15. A boat travels 30 miles upstream in 4 hours. The trip downstream takes 2.5 hours. Find the rate of the boat in still water.
20. Solve: 5x^2  10x = 0
50. (x1)(x^3 + x^2 + x) =?
Thanks
MC

2. Let x = minutes
7.95 + .05x = 9.95 + .03x
Solve for x.
15. Can't help here.
20. 5x(x2) = 0
x = 0 or 2
50. Do you want to factor or multiply?