Pls pls help im super confused
and pls show work not just answer

Step-by-step explanation:

multiply .20 by each of the students in the grade levels.

310x.20=62

358x.20=71.6

402x.20=80.4

you would do this because 20%=.20

he wants to survey 20% of students in each grade level so he would multiply .20 by each number of students in the grade level.

(does that make sense?)

7

step-by-step explanation:

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b