What property in math does 20-20=0 go on? This is my sisters homework question ...

robin is making bows to sell at her mother's yard sale. she will use 3/4 foot of red ribbon and 2/3 foot of blue ribbon to make each bow. what is the ratio of length of red ribbon to blue ribbon written as a unit rate

Rewrite the expression 6i - (-9i + 3)

In two years, Marquise will be 1/3 of her mother's age. What is his mother's age?

You work for a rental car company. If customers return a car with under half a tank of gas, they are charged $8 per gallon of gas to fill up the tank. Otherwise, it costs $4 per gallon of gas to fill up the tank.

A rectangle is 18 inches long and 12 inches wide. What is the perimeter of this rectangle? 30 in. 36 in. 50 in. 60 in.

Write an algebraic to model the phrase. the base price of a car plus 7.5% tax represents the total cost of the car.

Ursula has 1/2 cup of butter. She uses 1/4 cup of butter to make a batch of brownies. How many batches of brownies can Ursula make with 1/2 cup of butter?

When this polynomial is simplified, what is the coefficient of x: 10x^2+8x-6x^3+4x^2+12x^3-x+20 ... ?

A club is making posters to raise money. the printer charges a base fee of $270 and $2 per poster for supplies. a person sells each poster for $5. how many posters must he sell to make profit of $300?

Write ratio in simplest form 6:3/5