3cards one red and red one blue and blue one red and blue. what's the probability you will see red and blue

Ivan and jeff buy a package of 8 pens for $4.00. ivan wants 5 of the pens, and jeff wants 3.how much should each student pay?

Me asap on # : explain how factoring a trinomial, ax^2+ bx+ c, when a does not equal 1 different from factoring a trinomial when a = 1.

If f(x)=x+7 and g(x)=1/x what is (fog)(x)