plz help me out with my alegbra... Rational Expressions...?

1. 3x-3 / 3x+18

x-1 / 3x+18
x-1 / x+6
x+6 / x-1
3(x+1 / x-6)

2. 2x^4 / x^4 - 3x^5

3. x^2+4x-12 / x^2+x-30

4. The rate of discount, R, can be determined using the formula R = 1- P-D / P where P is the regular price of an item and D is the discount, or amount saved off the regular price. Find the rate of discount on a sweater with a regular price of $31 that is on sale for $29. If necessary, round to the nearest hundredth.


anyhelp would be great :)
 
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