What is the diameter of a normal kids heart

Lena bought a total of 20 postcards. She bought 6 more large postcards than small. Write a system of equations that represents the postcards Lena purchased. Solve the system by substitution. Interpret the solution.

Factor the expression. 9b^2-25

The areas of the sides of a rectangular box are 10 in. 2, 14 in. 2, and 35 in. 2 What is the volume of the box?

The mass, m, of an object varies directly with its kinetic energy, K, and inversely with the square of its velocity, v. The mass of an object stays the same, but the velocity of the object is halved.

The area of a rectangle is 64 square centimeters. The rectangle is 4 centimeters wide. How long is the rectangle.

On a 100-question math exam, Traci needs to get at least 75 correct answers to pass. If Traci id certain of her 50 answers, how many correct answers does she need to get in order to pass the exam?

On Fridays, Harry's school serves a choice of hamburgers or pizza for lunch. 60% of the sixth grade class ate pizza this Friday. If 36 sixth grade students ate pizza, how many students are in the sixth grade?

How do you evaluate the integral of absolute value of (x - 5) from 0 to 10 by finding area?

Given the function: f (x) = 2x^ 3 - 3 2 x, find f ( - 4)). es

Triangle MRN is created when an equilateral triangle is folded in half.