Help I don't understand this, Can someone explain this to me?

The second answer is correct (5 x 1,000,000,000)

Step-by-step explanation:

Just count the number of zeros. Multiplying a number liket his by five doesn't change the number of zeros

5×1,000,000,000

Step-by-step explanation:

You multiply all of them and whichever gives you the the same number as 5,000,000,000 is the right one which so happens to be 5×1,000,000,000

mean, 40.6

step-by-step explanation:

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)