Why is mental addition and subtraction important when you learn more difficult concept

Match the equivalent expressions. 7x - 8y 7x + y 5 (x + y) + 6 (x - y) (5x - 3y) - x + 3x - 5y 4 (x + y) - 3 (x + y) x - 4x + 6y + (14x - 5y) 11x + y 3x + 3y + 2 (2x - y) 11x - y

An aquarium tank is 1/6 full of water. When 2 gallons of water are added, the tank becomes 1/4 full. What is the total capacity of the aquarium tank, in gallons?

Find the rate of change for the situation. you run in 7 miles in one hour and 14 miles in two hours.

We would like to use the relation V (t) = I (t) RV (t) = I (t) R to find the voltage and current in the circuit as functions of time. To do so, we use the fact that current can be expressed in terms of the voltage.

What is the value of the expression? (5/2) ^2 + 3/4 ^3

What is 17=3x+2y in slope intercept form

Mia is taking art and calculus courses on Mondays. She is late for the art class with probability 0.5 and late for the calculus class with probability 0.4. Suppose the two events are independent.

Fill in the blank 9,15,24,39,63,102,165,_,432,699,1131

Fill in the other coordinate for line 2x-5y=11: (2)

H - 8 = 32 what is H?