Find

∫^[infinity]_-[infinity] x / (1+x^2) ^2 dx.

The sum of the two-digit number is 11. Twice the tens digit plus 2 equals ten times the ones digit. What is the number?

What is the value of x + y + z when 6x + 5y - 2z = - 4 and 4x + 5y + 12z = 54?

Determine the quadrants in which each angle lies

A fountain shoots water into the air. The graph shows a water droplet's height y in feet x seconds after it is shot from the fountain. What does the x-intercept of 6 represent? A. It takes 6 s for a water droplet to rise and fall back to the ground.

What fraction would represent the number 3.45

In a large apartment building, 35 of the apartments have a balcony and 55 do not. An apartment is randomly selected as part of a survey. What is the probability it has a balcony? Enter your answer to the nearest percent in the box.

What would the sum of 137,638 plus 52,091 be? After the two numbers are estimated? Three different people here ... three different answers.

The probability of an event happening is (11/30), what is the probability of the event not happening?

4 pounds of kitty litter cost $1.92. What is the price per ounce?

48 is what part of 60