My sister is 11 years old. My brother says that his age minus seventeen is equal to my sister’s age. How old is my brother?

The weight of an object in a particular scale is 175.2 lbs. the measured weight may vary from the actual weight by at most 0.1 lbs. what is the range of actual weights of the object

Factor this polynomial completely x^2-64

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left