420=2 (r+10) what is the total value of r

Araceli had 61 pennies and then lost 12. Now she wants to buy a treat that costs 4 sevenths of the pennies she has left. How many pennies does the treat cost?

Joe work 21 hours on his class project. He worked 3 times as long is Marie did. How long did Marie work on a project? Translate and solve the equation

The length of a rectangular garden is 55 m greater than the width. the area is 104104 msquared2. find the dimensions of the garden.

How many different ways could eight students sit in a semicircle to watch an experiment? 40,320 5,040 8

Solve 3x + 4y = 8 2x+5y = 10

A dance academy charges $28 per class and a registration fee of $20. A student paid a total of $1000 to the dance academy. Construct and solve an equation to find the number of classes the student took.

It costs $100 to join a fitness center plus a monthly fee. you spent $700 last year at the fitness center. how much was the monthly fee? write and solve an equation to determine the monthly fee.

A circle has a diameter of 8 m. What is the circumference of the circle? (Express your answer using π.) A. B. C. D.

How many shapes are in the world

In the solution to the equation shown, what property allows you to transform from one step to the next? 4/5x=1 5/4•4/5x=1•5/4 A. Addition Property of Equality B. Subtraction Property of Equality C. Multiplicative Inverse Property D.