Solve the systems of equations by substituting y=-5 5x+4y=-20

One number is four more than a second number. Three times the first is 12 less than 2 times the second. Find the numbers

A ball is thrown in the air from a ledge. Its height in feet is represented by f (x) = - 16 (x2 - 6x - 7), where x is the number of seconds since the ball has been thrown. The height of the ball is 0 feet when it hits the ground.

What's the square root of 245

What is the answer to this equation 3x+10=1

How much does Smarto the Baby Elephant weigh?

Find the indicated partial derivatives. w = x y + 7z

Identify the terms and like terms in the expression - x - 9x*2 + 12x*2 + 7

Write these decimals as words 25. 134 100.01 HALP

Four friends bought 10 lbs of nuts and shared them equally. How many pounds if nuts did each friend get

Ten friends went to a local restaurant and all had the buffet at $6.75 each. Seven friends added ice cream for dessert for $1.99 each. Since it is a large group, a tip of $15.00 for the waitress was added. The following is the restaurant bill.