19. Mr. Johnson owns a restaurant. On Monday morning, his restaurant has 80 steaks in the walk-in cooler. Each day 7 customers o
2 answers:
Answer:
C. Friday 52, Saturday 45
Step-by-step explanation:
Mr. Johnson owns a restaurant. On Monday morning, his restaurant has 80 steaks in the walk-in cooler.
Each day 7 customers order a steak dinner.
So, from Monday to Thursday, that is 4 days ; steaks were used.
So, when the restaurant opened on Friday, it had steaks.
And 7 were used on Friday also so remaining were =
Hence, on Saturday there were 45 steaks.
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Answer:
Verified
Step-by-step explanation:
Let the diagonal matrix D with size 2x2 be in the form of
Then the determinant of matrix D would be
det(D) = a*d - 0*0 = ad
This is the product of the matrix's diagonal numbers
So the theorem is true for 2x2 matrices
Yes, the inverse of a symmetric matrix is also symmetric.
Take the symmetric matrix A, we have:
and
This gives:
Using the properties:
and 
We get:
Since
, we can perform the substitution to get:
Multiplying by
on both sides:
Proving that the inverse of a symmetric matrix is also symmetric.
Take the symmetric matrix A, we have:
and
This gives:
Using the properties:
We get:
Since
Multiplying by
Proving that the inverse of a symmetric matrix is also symmetric.