4 - 3/5 (3a + 4) = 7

a. 7.4
b.-6
c. 3
d. -3

a = -3

Step-by-step explanation:

first, we remove the parentheses.

4 - 9/5a - 12/5 = 7

then, we calculate.

8/5 - 9/5a = 7

next, we multiply both sides.

8 - 9a = 35

then, we move the constant to the right.

-9a = 35 - 8

next, we calculate.

-9a = 27

finally, we divide both sides.

a = -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