If Amy can swim 20 laps in 30 minutes what’s the rate per minute

With alll of except for the 2 that i did already

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

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.