How to determine if a function is one to one algebraically?

Lance, Rachael, and Jamie are playing catch. Lance throws the ball to Rachael, Rachael to Jamie, and Jamie back to Lance. The angle formed at Rachael's position measures 90°.

In a set of 9 balls, 5 are blue. the balls are placed into a bag. mark is trying to get a ball that is not blue. he picks one ball, puts it back, and then picks another ball. what is the probability he picked a blue ball both times

Adds to be - 12 multiplies to be 63

True or False? 9.00 = 9 = 9.0

Which number is the outlier in this data set?9,12,32,8, or 11?

How do I simplify 9/243

How far does Gerry live from school

Percent sales tax: 7% price before tax: $250 price with tax:

Can you show the work to 156 divide by 11

Which expression is equivalent to a + (c + 7) ? 7 a c a minus (c + 7) (c + 7) minus a (a + c) + 7