3x 10, then 5 x 10, then 7 x 10, then tell if it is going positive or negative

3 x 10 = 30

5 x 10 = 50

7 x 10 =70

30 is positive, 50 is positive, 70 is positive

Step-by-step explanation:

When multiplying 3 by 10, imagine 10 being adding by 10 three times.

10 + 10 + 10

Then add

30

If you know even numbers they go:

2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,etc.

These steps also work for 5 x 10 and 7 x 10.

Imagine 10 being added by 10 five times.

10 + 10 + 10 + 10 + 10 = 50.

Imagine 10 being added by 10 seven times.

10 + 10 + 10 + 10 + 10 + 10 + 10 = 70.

The answers is (D). to determine the number of students who would be interested in a school trip to New York City.

Step-by-step explanation:  We are given four options out of which we are to select which sample fairly represents the population.

We can clearly see the options other than the last will not represent the population, because they are not related to the number of individuals.

Only the last option is related to the number of individuals, which will be our required sample.

Thus, the correct option is (D). to determine the number of students who would be interested in a school trip to New York City.