R+12 = 3r + 4

What's the value of r?

What is 5{10[6+2 (17-8) + 12]} and how do u work it out. Also what is 2{5[7+4 (17-9) - 22]} and 3{2[6+4 (7+3) - 2]}

James is 19 years old. He is three years older than twice his sister's age. How old is James' sister?

Which of the following equations has the given solution set

What is the radius and diameter of 7

A triangle has an area of 30 cm². The base and height are scaled by a factor of 3. What is the area of the resulting triangle?

A company estimates its total profit (profit = total revenue minus total cost) as P (x) = 2x5 - 3x4 - 5x2 - 2, where P is in thousands of dollars and x is the number of years elapsed since the company was founded.

On a number line, the surface of a river is marked at - 225 feet and the top of a building is marked at + 18 feet, where 0 represents sea level.

The length of a rectangle is 3 inches more than its width, and its perimeter is 22 inches. Find the width of the rectangle. 4 in. 5 in. 7 in.

In 2017, the world's population was 7.451 billion people. Tge world growth rate is 1.13% annually, (a) what the projected world's population in 2035? (b) how long will it take for world's population to double?

What multiplies to 105 and adds to 16