A tutor works with a group of students. The tutor charges $40 plus $30 for each student in the group. Today the tutor has s students and charges a total of $220. Write an equation to represent this situation.

3 students.

Step-by-step explanation: 30 + 40= 70

220/70=30

so 3 students are in a group

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

i think the answer is b.

step-by-step explanation:

not 100% sure though.