I will mark brainliest to first person who figures out this riddle - What comes once in a minute, twice in a moment, but never in a thousand years?

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Atorch and a battery cost 2.50 altogether.the torch costs 1.50 more than the battery.what fraction of the total price is the torch? give your answer in its simplest form.

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.