Question 12: There are only red, black and green pens in a box. There are three times as many red pens as green pens.
There are four as many black pens than red pens.
Work out the probability of a black pen being selected

working pls !! :D

You're doing something i dont know how to do but search up on google slope calculator maybe that will get you there

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.