Im so confused can someone btw the top is

This one is for #5

Simplifying

x2 = 225

Solving

x2 = 225

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Simplifying

x2 = 225

Take the square root of each side:

x = {-15, 15}

This one is for #6

22x2 -  49  = 0

Factoring:  4x2-49

(2x + 7) • (2x - 7)  = 0

Solve  :    2x+7 = 0

Subtract  7  from both sides of the equation :

                     2x = -7

Divide both sides of the equation by 2:

                    x = -7/2 = -3.500

Solve  :    2x-7 = 0

Add  7  to both sides of the equation :

                     2x = 7

Divide both sides of the equation by 2:

                    x = 7/2 = 3.500

x = 7/2 = 3.500

x = -7/2 = -3.500

70,000 + 6,000 + 800 + 30

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