How can you determine if a piece-wise relation is a function?

An average adult body contains 5 quarts of blood. If an adult body donates 1 pint of blood, how many pints are left?

A basketball team has 12 players. In how many different ways can the coach select 2 players to be the captains for tonight's game?

Which is greater, 0.9 or 1.4

Some kids went on a bike ride. The ride was six hours long and the kids traveled 54 mi. For part of the ride they biked at a speed of 7 mph and for part of the ride they biked at a speed of 11 mph.

What is 142/1000 as a decimal?

Find all values of x such that sin 2x = sin x and 0 ≤ x ≤ 2π. (enter your answers as a comma-separated list.)

Which rectangular equation is equivalent to the polar equation r cos theta = - 2

How do I find the answer to 0.008 is 1/10 of

Write the following proportions using colons 7 is to 21 as 3 is to 9

With a tail wind, a plane traveled 840 miles in 3hrs. With the same wind as a head wind, the return trip took 30 minutes longer. Find the plane's airspeed (in still air) and the wind speed ... So lost smh