Rory sees that he needs 7 or more hours of sleep per night. He can use the data from his activity tracker to see if he is getting that amount of sleep on average. Write the hypotheses he would test if he claims that he is sleeping enough.

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

Which of the following circles have their centers on the x-axis? check all that apply.