How to add and subtract rational expressions with unlike denominators?

A principal orders t-shirts and wants to check some of them to make sure they were printed properly. She randomly selects 2 of the 10 boxes of shirts and checks every shirt in those 2 boxes. What type of sample is this? A. Simple random sample B.

Lashonda drove 225 miles using 10 gallons of gas. At this rate, how many gallons of gas would she to drive 441 miles?

Alexander was paid 56$ for 7 hours of work. how much money does Alexander's job pay per hour?

Joey has a collection of baseball cards that he has separated into two different value categories. His common cards are worth $0.75 each and his premium cards are worth $2.00 each.

A cubic inch of water weighs 0.036 pound. Which of the following rational numbers is equal to the weight of a cubic inch of water? A: 1/360 B: 1/36 C: 36/1,000 D: 36/100

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