Need asap don’t need working outs just the answer

see explanation

Step-by-step explanation:

pqr = - 1 × 5 × - 4 = - 5 × - 4 = 20

-5(a - b) = - 5(4 - (- 6)) = -5(4 + 6) = - 5 × 10 = - 50

5s² + st = 5 × (- 3)² + (- 3 × - 7) = (5 × 9) + 21 = 45 + 21 = 66

5c - de = (5 ×- 4) - (5 × - 3) = - 20 - (- 15) = - 20 + 15 = - 5

p² + 3q² = (- 10)² + (3 × (- 2)²) = 100 + (3 × 4) = 100 + 12 = 112

= = = 160

= = = = - 48

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

what