A triangle has sides 3x + 7, 4x -9, and 5x + 6. Find the polynomial that represents its perimeter. A. 8x + 4 B. 12x + 13 C. 8x –5 D. 12x + 42.

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

answer: 48

just remember to use pemdas:

parentheses

expressions

multiplication

division

addition

subtraction

i think 5 miles per hour

step-by-step explanation: