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
Serga [27]
3 years ago
10

phillip bought 12 used cds and dvds.cds cost $2 each,and dvds cost $3 each.he spent $31,not including tax.how many dvds did phil

lip buy?
Mathematics
1 answer:
inessss [21]3 years ago
8 0
Let c and d be the number of cds and dvds respectively.

c+d=12

c=12-d

The we are told that:

2c+3d=31, using c found above in this equation gives you:

2(12-d)+3d=31

24-2d+3d=31  

24+d=31

d=7

So Phillip bought 7 dvds.

check...

3*7+2(12-7)=31

21+2(5)=31

21+10=31

31=31
You might be interested in
Please hurry i need help and im stuck!!! helpsosososos
sammy [17]

Answer:

2

Step-by-step explanation:

the x and y are being multiplied by 2 e.g. 1 × 2 is 2 and 2 × 2 is 4 so the constant is 2

7 0
3 years ago
Read 2 more answers
The area of a circle is 100 square miles. What is the diameter?
adell [148]

Answer:

The diameter of a circle with an area of 100 square miles is 20/√π miles.

Step-by-step explanation:

Area =100 = πr^2.

diameter = d = 2r.

100 = πr^2.

100/π = r^2.

√(100/π) = r.

10/√π = r.

d = 2r.

d = 2 * 10/√π.

d = 20/√π

5 0
3 years ago
5x + 7x + 2x + 8 -2 please helppp
Murljashka [212]

Answer:

= 14X + 6

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
If the total profit per month is Rs 200,000 and the revenue per month can be obtained twice the cost per month minus 50,000, fin
motikmotik

Step-by-step explanation:

200,000 X 50,000 = 100000000

7 0
2 years ago
How long should the wooden frame be (use 3.14 for pi)
scoundrel [369]
C=2πr
The  C stands for circumference 
the π is Pi (3.14) 
and r is the radius (length of half a circle)

Since the sides are 10 ft you multiply that by 2 to get the length of both sides which gives you 20 feet. 

Then to find the circle, since both are half circles. You can just do the normal circumference equation and you will end up with the same answer.

For example in this problem: this problem gives you the diameter but you need the radius of the circle. C=2(π)(1.5)

C=9.42 < this is the circumference of the circle. 

Then you add the sides of the table which are 20 feet. 

So the final answer is 29.42 feet. 
6 0
3 years ago
Other questions:
  • John is 1 8 meter shorter than Paul, and Paul is 0.25 meter taller than Andrew. If John’s height is 1 3 4 meters, what is Andrew
    13·2 answers
  • 4. How fast was a driver going if the car left skid marks that were 32 feet long on dry concrete? (The coefficient of friction i
    8·1 answer
  • On a coordinate plane the vertices of a rectangle are (2,4), (2-1),(-5,-1),and (-5,4).what is the perimeter of the rectangle?
    10·1 answer
  • Write 197 m as a fraction of 2.7 km
    15·1 answer
  • Destiny is making a gelatin dessert for a party. She plans
    6·1 answer
  • Please help.. I’ve done two of these and have been doing work since 5:30 a.m. I’m so tired right now
    10·1 answer
  • Factor to write an equivalent expression.(What is the Greatest Common Factor?).<br><br> −9x+15y
    9·1 answer
  • PLSS HELP ASP Nick bought raffle tickets to try to win a prize. He paid $3.00 for $12 tickets.
    8·2 answers
  • Please help a girl out I'm so confused
    15·1 answer
  • Gabriel purchases a rug priced at $475. With sales tax, the total comes out to $513. What is the sales tax percentage?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!