7) Calculate which is the best deal? Fill in the blanks below for your final answer. Round your answers to the nearest penny.
2 answers:
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Answer:
y = 1.5
Step-by-step explanation:
Given x is inversely proportional to , then the equation relating them is
y = ← k is the constant of proportion
To find k use the condition when x = 8, y = 2
2 = =
=
( multiply both sides by 3 )
6 = k
y = ← equation of proportion
When x = 15 , then
y = =
=
=
= 1.5
The vertex is
Explanation:
The equation is
To find the vertex, we need the equation in the form of
Dividing each term by 2 in the equation
Now, completing the square by adding and subtracting 1, we get,
The first three terms can be written as ,
Multiplying 2 into the bracket, we get,
This equation is of the form
Now, we shall find the vertex
Thus, and
Thus, the vertex is