1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
AlekseyPX
3 years ago
15

Please solve! I will mark brainliest if correct!

Mathematics
2 answers:
a_sh-v [17]3 years ago
8 0
Hello,

So we can first assign HD videos and classic videos to specific variables, x is HD videos and y is classic videos.

Fiona bought 5 HD videos, and 2 classic videos for 31 dollars.
5x + 2y = 31

Iliana bought 3 HD videos and 5 classic videos for 30 dollars.
3x + 5y = 30

Therefore, the final answer is choice D, 5x + 2y = 31 and 3x + 5y = 30. 
Dovator [93]3 years ago
6 0
If you use the system of equations, then the answer would be d because the equations relate exactly to the amounts of cds each person bought
You might be interested in
Match the parabolas represented by the equations with their foci.
Elenna [48]

Function 1 f(x)=- x^{2} +4x+8


First step: Finding when f(x) is minimum/maximum
The function has a negative value x^{2} hence the f(x) has a maximum value which happens when x=- \frac{b}{2a}=- \frac{4}{(2)(1)}=2. The foci of this parabola lies on x=2.

Second step: Find the value of y-coordinate by substituting x=2 into f(x) which give y=- (2)^{2} +4(2)+8=12

Third step: Find the distance of the foci from the y-coordinate
y=- x^{2} +4x+8 - Multiply all term by -1 to get a positive x^{2}
-y= x^{2} -4x-8 - then manipulate the constant of y to get a multiply of 4
4(- \frac{1}{4})y= x^{2} -4x-8
So the distance of focus is 0.25 to the south of y-coordinates of the maximum, which is 12- \frac{1}{4}=11.75

Hence the coordinate of the foci is (2, 11.75)

Function 2: f(x)= 2x^{2}+16x+18

The function has a positive x^{2} so it has a minimum

First step - x=- \frac{b}{2a}=- \frac{16}{(2)(2)}=-4
Second step - y=2(-4)^{2}+16(-4)+18=-14
Third step - Manipulating f(x) to leave x^{2} with constant of 1
y=2 x^{2} +16x+18 - Divide all terms by 2
\frac{1}{2}y= x^{2} +8x+9 - Manipulate the constant of y to get a multiply of 4
4( \frac{1}{8}y= x^{2} +8x+9

So the distance of focus from y-coordinate is \frac{1}{8} to the north of y=-14
Hence the coordinate of foci is (-4, -14+0.125) = (-4, -13.875)

Function 3: f(x)=-2 x^{2} +5x+14

First step: the function's maximum value happens when x=- \frac{b}{2a}=- \frac{5}{(-2)(2)}= \frac{5}{4}=1.25
Second step: y=-2(1.25)^{2}+5(1.25)+14=17.125
Third step: Manipulating f(x)
y=-2 x^{2} +5x+14 - Divide all terms by -2
-2y= x^{2} -2.5x-7 - Manipulate coefficient of y to get a multiply of 4
4(- \frac{1}{8})y= x^{2} -2.5x-7
So the distance of the foci from the y-coordinate is -\frac{1}{8} south to y-coordinate

Hence the coordinate of foci is (1.25, 17)

Function 4: following the steps above, the maximum value is when x=8.5 and y=79.25. The distance from y-coordinate is 0.25 to the south of y-coordinate, hence the coordinate of foci is (8.5, 79.25-0.25)=(8.5,79)

Function 5: the minimum value of the function is when x=-2.75 and y=-10.125. Manipulating coefficient of y, the distance of foci from y-coordinate is \frac{1}{8} to the north. Hence the coordinate of the foci is (-2.75, -10.125+0.125)=(-2.75, -10)

Function 6: The maximum value happens when x=1.5 and y=9.5. The distance of the foci from the y-coordinate is \frac{1}{8} to the south. Hence the coordinate of foci is (1.5, 9.5-0.125)=(1.5, 9.375)

8 0
2 years ago
Help please ASAP. Correct answer will get brainly
djverab [1.8K]

Answer:

I think it's 3,6.....................

4 0
2 years ago
Read 2 more answers
The following data points represent the number of puppies in each litter at Port's Pup Rescue.
NikAS [45]
2,2,6,7,9,11,14

And the Median is 7
3 0
3 years ago
Garrick's science class recycles old batteries at the TRECA recycling center. The center pays a fixed amount for each ounce of m
Mars2501 [29]
T = na

because, total equals to ounces of the material times the amount payed.
8 0
3 years ago
Read 2 more answers
Ricky is filling an 8 inch by 4 inch by 4 1/2 inch rectangular box with packing peanuts. The peanuts are cubes that come in two
RideAnS [48]
First find the volume of the box: 8•4•4.5=144 cubic inches.
8 of the 1/8 inch=1 of the 1 cubic inch
He could do 144 and 0
143 and 8
142 or 16
Or just keep following the pattern... Hope that helped
8 0
2 years ago
Other questions:
  • Can someone answer this for me
    13·1 answer
  • What is the area of a sheet of binder paper? (Binder paper is 8 1/2 inches by 11 inches.) 88 inches 88 1/2 in2 93 1/2 in2 94 in2
    13·1 answer
  • Match each sequence to its appropriate recursively defined function
    12·1 answer
  • What is 27 over 50 as a decimal and a percentage?
    7·2 answers
  • Help me!!!!!pleaseeeee
    5·2 answers
  • Need help can someone explain this problem<br>please.​
    5·1 answer
  • I don’t know where to start with this problem
    15·1 answer
  • PLZ HELP ME WITH THIS!!! I WOULD MARK YOU BRAINLIEST!!!
    9·2 answers
  • 10×5+4 2 +(5+30÷10) Order Of Operations
    13·1 answer
  • g Let X and Y be two independent standard normal random variables, i.e., each follows the distribution N (0, 1). Now, define two
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!