Which of the following gives all of the sets that contain square root 9

In the pendulum formula t=2pi. read the problem on the picture ! ; $; $; ! ; ! ; ! ; )$; ! ; ! ; ! ; $; $; $! ; ! ; ); $; $$

Carley bought a jacket that was discounted 10% off the original price. the expression below represents the discounted price in dollars, based on x, the original price of the jacket.

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab