Answer:
This is an inverse variation, and the constant of variation is k = 2.
Step-by-step explanation:
Direct variation is something like:
y = k*x
Where k is the constant of variation.
So as x increases also increases y.
Inverse variation is something like:
y = k/x
k is the constant of variation.
In this case, if x increases, y decreases.
Now let's look at the equation:
-10 + 15*x*y = 20
Let's isolate y in one side of the equation:
15*x*y = 20 + 10 = 30
15*x*y = 30
y = 30/(15*x) = (30/15)/x = 2/x
y = 2/x
Then we can conclude that this is an inverse variation, with a constant of variation equal to 2.
Answer:
20925
Step-by-step explanation:
multiply 675 by 11 to get 7425. Add 7425 to 13500 to get 20925. To check minus 20925 by 7425. I got 13500. So this answer is reasonable.
If there is no expression, it surely is equal to 0.
Answer/Step-by-step explanation:
Exercise 5:
a. 180 pages was read in 5 days
Unit rate = pages per day = 180 pages ÷ 5 = 36 pages per day.
b. Number of pages of the book = 765 pages
Unit rate = 36 pages per day
Number of days to read the book = 765/36 = 21.25
It will take Kirk about 22 days to finish reading the book.
