Let a = 3
2 5
b = −2 7
3 −4
c = −5 3
2 −1
= 0
0 0
and = 0
0 1
evaluate the following.
a. a + b
b. b + a
c. a + (b + c)
d. (a + b) + c
e. a +
f. a +
g. a ⋅
h. ⋅ a
i. ⋅ a
j. a ⋅ b
k. b ⋅ a
l. a ⋅ c
m. c ⋅ a
n. a ⋅ b + a ⋅ c
o. a ⋅ (b + c)
p. a ⋅ b ⋅ c
q. c ⋅ b ⋅ a
r. a ⋅ c ⋅ b
s. det(a)
t. det(b)
u. det(c)
v.
w.
x. det(a ⋅ b ⋅ c)
y. det(c ⋅ b ⋅ a)

i'm assuming it's looking for the missing length, which should be 4cm

hope this !

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 is because 4×10=40

and 98×4= is 392

40,392