Prove algebraically that a straight line with equation x=2t+5 is a tangent to the circle with equation x^2+y^2=5

Aefg - almn. find the ratio of aefg to almn. a)1: 4 b)1: 2 c)2.1 d)4: 1

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.

What is the product? a-3/15a × 5/a-3