Answer:
Let the number of books she can purchase = b
The cost of each book is $5.5 with an extra shipping of $7.5
So, the total cost of the books she can purchase = 
Since, she had $65 to spend on the books.
The required inequality is 
.
So, according to the inequality above, we get,
The correct options are,
B. The inequality symbol is incorrect because she can spend up to and including $65.
C. The expression is correct because $5.50 per book is 
and that is added to the shipping fee of $7.50 to determine the total purchase price.
The slope-intercept form:
m - slope
b - y-intercept
We have the slope m = -3 and the y-intercept b = 1. Substitute:
It is a linear function. We need only two points to plot the graph.
Select two values of x. Put them in the line equation and calculate the values of y.
for x = 0:
for x = 1:
V = `1/3 * πr² * h
The half of a diameter is the radius. So, r = d/2. Substituting the values
V = 1/3 * (3.14)(5/2)² * 7
V = 45.79 or 46 cm³
The answer is letter B.
