Answer:
- B. $5 for each vinyl, $4 for each CD, and $1 for each electronic download
Step-by-step explanation:
Let the prices be
- Vinyl - x
- CD - y
- Electronic download - z
<u>Set the following equations based on the number of purchased items</u>
Sarah
Jamie
Frank
- 6x + 6z = 36 (<em>note: it can't be 30, corrected in the process of solution</em>)
Solve by substitution, simplify the third equation first
Substitute the value of x into the first two equations
3(6 - z) + 4y + z = 32
⇒ 18 - 3z + 4y + z = 32
⇒ 4y - 2z = 14
⇒ 2y - z = 7
⇒ z = 2y - 7
2(6 - z) + 5y + 7z = 37
⇒ 12 - 2z + 5y + 7z = 37
⇒ 5y + 5z = 25
⇒ y + z = 5
Solve by substitution again to get
- y + 2y - 7 = 5
- 3y = 12
- y = 4
Find z
Find x
The solution is
Correct choice is B
Answer: Point P is at (3, 7)
Step-by-step explanation: the distance from point a to point B is 10.8. 10.8 divided by 3 is 3.6, so you have to find a point that 3.6 from point a. Using a graph, I found the answer to be (3,7)
Answer:
c
Step-by-step explanation:
Answer:
No correlation
Step-by-step explanation:
There is not a positive line of dots
There is not a negative line of dots
so that means there is no correlation
Exponential Decay because it’s decaying by .5 which is smaller than 1
