What is the value of the ecpression 2x^2+3xy-4y^2when x=2 and y=-4?

Adam's father spent 1 hour and 50 minutes working on his truck. If it was 7:35 when he stopped working, what time was it when he originally started?

The mean lifetime of a certain tire is 30,000 miles and the standard deviation is 2500 miles. If we assume nothing about the shape of the distribution, approximately what percentage of all such tires will last between 25,000 and 37,500 miles?

What percent is $15.60 of $156.00?

Sara goes to Fredonia University. 900 in her savings account. She needs to buy a small laptop computer before the next semester. The laptop cost $600. Every 2 weeks she withdraws $60 from her savings account for food.

Consider the following algorithm ... for. i is in {1, 2, 3, 4} do. beep. for j is in {1, 2, 3} do. beep. for k is in {1, 2, 3, 4} do. for l is in {1, 2, 3, 4, 5} do. beep. for m is in {1, 2, 3, 4, 5, 6} do. beep.

Solve for x: a (x+b) - c=d

3x - 7y = 5 9y = 5x + 5

Elyse has earned scores of 87, 91, 90, and 85 on her first four math tests. If she wants to have a mean of 90, what must she earn on the fifth test?

How many balls each of radius 2cm can be made from a solid sphere of lead of radius 8cm

Delia spent 45 minutes working on her book report she finished at 6:10 p. m. at what time did delia start working on her paper