7(c + 5) − f 4 ; c = −1, f = 3
Can someone explain how to solve this?

16

Step-by-step explanation:

you replace the letter with the number given to replace them. So, in the equation you replace the letter C with -1, as it tell you on the side. You do the same with F, but with 3. your equation should look like: 7(-1 + 5) - 3 × 4. you then solve from there and should get 16. I hope this is right, if not my bad

B. 1/18

Step-by-step explanation:

We know that in the case of pencils, there are 6 in total, and since there is one of each, the probability of each would be:

1/6

In the pen, it is similar, since there is also one of each and in total there are 3, therefore the probability is:

1/3

Which means that the final probability is:

1/6 * 1/3 = 1/18

Which means that the answer is B. 1/18