exam Maths Puzzle Numerical Ability

A sales commission on a $12,500 car is $625. what is his rate of commission?

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Hi could you help me with this question on rational expressions?

Simplify each rational expression. State any restrictions on the variable.
3x^2-12/x^2-x-6

Thanks for the help!
Determine which two equations represent parallel lines.
(a) y=3/7x+1
(b) y=-7/3x-4
(c) y=3x+8
(d) y=3x-1

A) (a) and (b)
B) (b) and (c)
C) (a) and (d)
D) (c) and (d)