How many solutions does the system of equations have?
y=4x-9 y-4x=6

What is the number 321,000,000 in scientific notation? also what is the number? ?

The chs baseball team was on the field and the batter popped the ball up. the equation b(t)=80t-16•16+3.5 represents the height of the ball above the ground in feet as a function of time in seconds. how long will the catcher have to get in position to catch the ball before it hits the ground? round to the nearest second

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?