When a mathematician writes QED at the end of a proof, what does this mean?

The Davidson family wanted to expand its rectangular patio, which currently measures 15 ft by 12 ft. They want to extend the length and width the same amount to increase the total area of the patio by 160 ft^2.

Is the simplified form of 2square root of 3 • square root of 12 rational?. Yes. No

A cat consumes 2 cups of milk every day. How much milk does that cat drink on an average in a week?

If 30% of a number is 18, what is the number?

Write a polynomial for the volume of a cube with side lengths of x - 1 inches

Two different ways for 59

Subtract 4 from 10. Then, multiply by z

On a number line, M is at 0 and N is at 9. What is the coordinate of P, which is 2/3 of the way from M to N

The ratio of people who walk home from school to people who ride the bus home is 2:7 The number of bus riders is how many times the number of walkers

Y=-2x-1 slope intercept graph