Solving equations is our happy place

-20 = -4x

A local pound only has dogs & cats, in the ratio of 4:3. How many cats for 28 animals total?

Write the following in standard form: -18 +5y = -2x

A mathematical sentence that shows that two expressions are equal.

A symbol (usually a letter) that represents an unknown quantity.

- 1= 6p + 3p -10

8n + 7 = 31

Operations that undo each other; addition, subtraction, and multiplication.

Solve: x:5 = 21:15

Rearrange for "h" in V = πr²h

1500 mL of blood is donated every 2 people. How many mL will be donated if we have 85 donors?

12 =-4(a+5)