The first problem Levi solves is incorrect, because 5/4 is not equal to 20.
The second problem Levi solves is correct, because 1.5 x 10 is 15, which subtracting 8 is equal to 7.
The third problem Levi solves is correct, because 4 x 13 is 52 and plus 6 it is 58.
I hope this helps!
Step-by-step explanation:
The number n is - 5
Because the sum = 8 + (-5) = 3
After multiply by - 4 = 3 x - 4 = - 12
Option A is the correct answer
It is TRUE that a corollary is a statement that can be easily proved using a theorem.
Answer:
-96 + 672\,i
Step-by-step explanation:
This is a product of complex numbers, so we have in mind not only the general rules for multiplying binomials, but also the properties associated with the powers of the imaginary unit "i", in particular 
We start by making the first product indicated which is that of a pure imaginary number (-6i) times the complex number (8-6i). We use distributive property and obtain the new complex number that results from this product:

Now we make the second multiplication indicated (using distributive property as one does with the product of binomials), and combine like terms at the end:
