exam Maths Puzzle Numerical Ability

use the horizontal line test to determine which of the following are one to one functions

A) y=2x^2+5x-3 B) y= [x-2] C) y=x^-1/2

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exam Other Question

Tickets to the Superbowl were selling for $325. When it got closer to the big game ticket prices skyrocketed to $3055. What was the percent of increase Find the indicated function.
Let f={(-9,-2),(-8,-4),(-5,-1)} and g={(-9,1),(-7,-9),(-5,-2)}. Find f+g