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m ≥1187

Step-by-step explanation:

Flat fee plus cost per minute equals total cost

19 + .04m ≥ 66.48

Subtract 19 from each side

19 -19 + .04m ≥ 66.48-19

.04m ≥47.48

Divide by .04

.04m/.04 ≥47.48/.04

m ≥1187

the answer is c. 23/3

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