21 is 12% of what number?

What is the average of 9,4 and 5

The function h is defined by h (x) = 2x^2 + 3. Find h (2x)

In 25 words or fewer, write x² + 2x - 1 = 0 in English words.

A rectangle has vertices A (2,6), b (2,9), c (7,9), d (7,6). what is the perimeter of the rectangle?

How do you find the mean, median and range

How does the volume of a prism change if each dimension of the present is doubled

In 2010, Car A was the highest mileage car available in a country. It's estimated highway mileage was 4 miles per gallon more than car B. if the two cars could travel a total of 90 miles on a gallon of gasoline, find the mileage of each car.

Person A buys 12 granola bars and 7 cups of yogurt for $15.50. Person B buys 6 granola bars and 11 cups of yogurt for $11.50. Find the cost of each item

What does it equal?

a plumber charges $64 per hour for labor and x dollars for replacement parts. the total bill is $284 and includes 3 hours of labor. How much does the plumber charge for the replacement parts. write an equation