Find the second derivative of xy + y^2 = 1.

The first derivative is - y (x + 2y) ^ (-1).

Three consecutive prime numbers that add up to 97

Find the function y1 of t which is the solution of 16y′′-81y=0 with initial conditions y1 (0) = 1, y′1 (0) = 0.

What is the mean for 34,56,78,98?

What is the joint relative frequency for 11th graders who want the break in the afternoon? Round to the nearest percent.

What is the axis of symmetry for. y = - 3x^2 + 18x - 31

Write an algebraic expression that represents the quotient of a number and 20

Approximate the value of 12-2pie

Jeff is buying apples and bananas from the farmer's market. He know that to find his total cost he will use the expression 1.25a + 0.50b, where a stands for the number of apples he bought and b stands for the number of bananas he bought.

A theater charges $5 for student tickets and $7 for adults tickets. They sold 75 tickets for a total of $425. Which set of equations can be used to determine x, the number of students tickets sold, and y, the number of adult tickets sold?

Give a real-world example of an experiment in which all of the outcomes are not equally likely. Can you make a prediction for this experiment, using theoretical probability?