Simplify the following rational expression. Show your steps please!!

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.