A gas station attendant is making 1000 gallons of antifreeze that is 48% alcohol. He has some antifreeze that is 40% alcohol and some that is 60% alcohol. How much of each type of antifreeze should he use? (x = amount of 40% alcohol antifreeze and y = amount of 60% alcohol antifreeze)

He uses
gallons of 40% and
gallons of 60% to make 1000 gallons of 48% alcohol antifreeze.
PLEASE ANSWER QUICK

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

Andy has $310 in his account. each week, w, he withdraws $30 for his expenses. which expression could be used if he wanted to find out how much money he had left after 8 weeks?

Use a calculator to verify that σ(x) = 62, σ(x2) = 1034, σ(y) = 644, σ(y2) = 93,438, and σ(x y) = 9,622. compute r. (enter a number. round your answer to three decimal places.) as x increases from 3 to 22 months, does the value of r imply that y should tend to increase or decrease? explain your answer. given our value of r, y should tend to increase as x increases. given our value of r, we can not draw any conclusions for the behavior of y as x increases. given our value of r, y should tend to remain constant as x increases. given our value of r, y should tend to decrease as x increases.