When i was 2 years old my sister was half in my age now i am 100 years old then how old is my sister?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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.

Write and solve a real word problem that involves determining distance on a coordinate plane