book Maths Puzzle Numerical Ability

Can you help me factor this polynomial?
18c^4 - 9c^2 + 7c

Read Solution (Total 0)

book Other Question

For number 48 I got all the way to the end i just dont know if it is right

x3 +2x+15x+10 A train left Shawnee traveling due west at 90 miles per hour. A car left Shawnee at the same time traveling due east at 60 miles per hour. How long will it take before the train and car are 405 miles apart? Put in nearest tenth of an hour.

thanx