Solve using elimination

10x - 5y = - 20

-5x + 5y = - 15

Solve 2 (L) + 3 (4L) = 990.50

How do you convert 9 quarts of tea into gallons

Using the expansions of cos (3x - x) and cos (3x + x), prove that 1/2 (cos 2x - cos 4x) ≡ sin 3x sin x.

If X=3 what is X cubed times X

Y+2=-5 (x-3) slope and Y intercept

3:2.52 what the answer I'm struggling

Solve the equation x^3+2x^2-5x-6=0

A ball is thrown from 4 feet off the ground with a vertical velocity of 30 feet per second. Write an equation to model the height of the ball: h = - 16t 2 + a0 t + a1 Complete the table.

Which conjecture explains the relationship between the angles in the construction below? A) Angle AOC is congruent to angle AOB. B) Angle AOB is half as big as angle COB. C) Angle AOC is twice the size of angle COB.

A parallelogram has a base of 7 and a height of 6. What is the area? units