15 grams of a radioactive substance decayed 11% over the course of 3 weeks. How many grams of the substance were left after the 3 weeks?

Y = 3x+7 y = - 2x-3 What would be the x and y for that solution

Tim, Kara, and Ann Are working together to write a 4-page report. Each student is going to do an equal amount of writing. What fraction of the entire report does each student need to write?

Consider the line y = - 5/4x+4. What is the slope of a line parallel to this line? What is the slope of a line perpendicular to this line?

A crate is 3/4 yard long and 2/3 yard wide. The crate is also 2 feet tall. What is the area of the top of the crate?

Add the following polynomials: 3a3 + 8a - 6 and 4a2 - 9a + 11

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