3. A. Mr. Sullivan is organizing teams for the middle school’s annual field day. There are eight classes at the school and 21 students in each class. What is the total number of students at the school?

3.B. Mr. Sullivan wants to have 12 students on each team. How many teams will there be?

PLEASE NEED HELP AND THE STEPS

Step-by-step explanation:

A)Total number of students at the school= Number of classes * number of students in each class

= 8 *  21

= 168 students.

B) Number of teams=Total students÷ Number of students in each team

= 168/12

= 14

There will be 14 teams

3: 2

step-by-step explanation:

shorter piece is 2: 3, so just reverse it, and you get 3: 2

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional