What is 21 as a decimal and prevent

How do I derive the area of a trapezoid?

The sum of the digits of the number 2016 is 9. What is the least number greater than 2016 whose sum of the digits is 9

What is the area of a regular octagon with apothem 2.5 centimeters? This is for geometry.

Andrea wanted to calculate 5% of 300, so she multiplied 300 by 0.5 (300 x 0.5). Explain why this equation will not produce the correct answer and what Andrea should have done to get the correct answer.

Justin wants to use 376ft of fencing to fence off the greatest possible rectangular area for a garden. What dimensions should he use? What will be the area of the garden?

Given the functions, f (x) = 3x^2-7 and g (x) = x^3+1 evaluate f (g (2))

Amra can run 20 kilometers in 3 hours. How long will it take her to run 5 kilometers?

The Square root of 20 lies between what two numbers

One winter day, the temperature ranged from a high of 20 degree Fahrenheit to a low - 25 Fahrenheit By how many degrees did the temperature change?

Solve the inequality 4-y > 5 for y. Show and justify your steps.