**Answer:**

c) 2/15

**Step-by-step explanation:**

The total number of marbles

5+6+4 = 15 marbles

First we find the probability of a blue marble. There are 6 blue marbles

P(blue) = blue/total = 6/15 = 2/5

We put the marble back so there are still 15 marbles in the bag

Then we find the probability of a red marble. There are 5 red marbles

P(red) = red/total = 5/15 = 1/3

Since we put the marble back, they are independent events, and we can multiply the probabilities.

P(blue, then red) = 2/5*1/3 = 2/15

You can decide by seeing which one measures object better. you want to avoid using the incorrect unit because it can meaure it wrong or it won't be as accurate as the right unit

**Answer:**

b)

**Step-by-step explanation:**

n²+n-42=0

Using mid-term break

n²+7n-6n-42=0

n(n+7)-6(n+7)=0

(n-6)(n+7)=0

Either,

n-6=0 **OR **n+7=0

n=6 **OR **n= -7

The correct answer is C all integers are whole numbers