K+12>20, if k=15 true or false

Acircle has a circumference of 7.850 units. what is its radius?

The price of a dozen eggs was $1.63. suppose the price increases m dollars per dozen and then the price decreases $0.12 per dozen. which expression represents the current price of eggs after the two price changes?

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.