Mathematics Middle School

4. A stamp collector has some 15¢ stamps and some 20¢ stamps. The number of 15¢ stamps is eight less than three times the number of 20¢ stamps. The total value is $4. Find the number of each type of stamp in the collection. PLEASE SHOW WORK

Answers

Answer 1

Answer:

Step-by-step explanation: Let variable x represent the 15¢ stamps, and variable y represent 20¢ stamps.

x= 3y-8

0.15x+0.20y = 4

Replace x in the second equation by (3y-8)

0.15(3y-8) + 0.20y = 4

0.45y - 1.2 +0.20y = 4

Collect like terms;

0.45y+0.20y = 4+1.2

0.65y = 5.2

Divide both sides by 0.65 to solve for y;

y= 5.2/0.65

y = 8

Replace in equation " x=3y-8 " to solve for x;

x = (3*8) -8

x=24 - 8

x = 16

Therefore, the 15¢ stamps are 16 in number, and the 20¢ stamps are 8 in number.

Related Questions

Can yall help me with this i forgot how to do this!

Answers

Ok so cut the circles into the bottom number! Then which ever is more filled out put a < to it!! Hope this helps tell me if you need more!

Answer:

which ever is more filled out put a < to it!

Step-by-step explanation:

alergater eats the bigest one

A school has 158 computers. They want each of the 6 grades to have the same number of computers. How many computers should each grade receive? Explain.

Answers

Each grade level should have 26 computers because 158/6= 26.3333 but you cant give a third of a computer so the answer is 26

Answer:

158/6=26.3333333333333333333333333333333333333334

Step-by-step explanation:

so u just divide how many computers they have whith how many grade levels that they have. and round up the numbers.  

Which expression results in a sum or difference of six and thirteen fifty fifths?

three and one fifth plus three and two elevenths
four and one fifths plus two and four elevenths
eight and ten elevenths minus two and three fifths
seven and seven elevenths minus one and two fifths

Answers

Answer: lesson 21

Step-by-step explanation:

What are the five characteristics a substance must have to be classified as a mineral?

Answers

Answer:

solid, inorganic, naturally occurring, definite chemical composition and definite crystalline structure

Step-by-step explanation:

can anyone help me with the top two (24 and 25) please?

Answers

I remember learning this but I can’t remember if the dots are colored in or not cause of the closed lines. You could probably honestly just look it up and it’ll tell you exactly how to do it

Sal is mailing 5 identical packages. Each package has a mass of 6 kilograms. What is the total mass of all 5 packages?

Answers

Answer:

30kg

Step-by-step explanation:

5 x 6=30

What is the length of the hypotenuse in the triangle below?
Write your answer in standard form and scientific notation.

Answers

for the people who keep putting random answers, please stop. this app is for us to help each other. put random letters isn’t going to help. so , before you think about putting random answers just to get points don’t do it. and , I don’t know the answers , I just had to put this out here.

Question 1 (1 point)
The following trendline equation predicts the retail cost, y, of a particular smartphone, x months after its initial release.

y = -30x + 1500

What is the predicted retail cost, to the nearest dollar, 5 months after the initial release?



Question 1 options:

$1,320


None of these


$50


$1,350

Question 2 (1 point)
The following trendline equation predicts the retail cost, y, of a particular smartphone, x months after its initial release.

y = -30x + 1500

When is this particular phone predicted to have a retail cost of $1200?

Question 2 options:

10 months after initial release


50 months after initial release


90 months after initial release


Never

Answers

Answer:

Where is the questio?

Step-by-step explanation:

Question 1 - $1350
Question 2 - 10 months after initial release

I need the answers to number 2 and 3

Answers

For 2 it is slope 3 and y intercept (0,5)
For 3 it is slope y=-4x-5
2) slope 3 & y intercept (5.00000)
3) slope y=-4x-5

A coat was originally priced at $60. It went on sale for $30. What was the percent that the coat was discounted?

Answers

50%. 60/2=30 or 60*.5=30. Dividing by two or multiplying by .5 are the same as taking 50%, meaning that there was a 50% discount
50 percent. Hope that helps.

plz help and could u plz explain how you did it and how to do it thanks :) (will mark as brain thingy if do)

Answers

Answer:

3

Step-by-step explanation:

Use the distributive property to rewrite the expression as a multiple of a sum of two numbers with no common factor.
24 + 12

Answers

The answer is 36 hope that helped
The answer is 36. Hoped this helped

Help please, I don’t understand, thanks! Ill give brainliest! :))

Answers

What he said hehe sorry for this

Plz help meee...
I BEG FOR HELP!!!

Answers

yeah it’s what they said ^^

HELPPPP
this is due today
WITH THE EQUATION

Answers

60% more than regular size. 230.4.

Which of the sss-values satisfy the following inequality?
7-\dfrac s2\gt 3

Answers

Answer:

A

Step-by-step explanation:

Substitute 6 into place and solving the answer gives you 4 which is indeed bigger than 3. All the other numbers will give you an answer of something lower than 3 which is not what we're looking for in this case.

A is the answer I’m pretty sure

pls answer i need good grades so i can play soccer

Answers

Answer:

2 Cups of peanut butter chip

Step-by-step explanation:

If she used 4 cups in her first batch with the 2:2 ratio then she would need to split in half because of the new 3:1 ratio.

Answer:

2 cups of peanut butter chips

Step-by-step explanation:

Hope this helps!!

There are 32 rabbits at the petting zoo. The ratio of pigs to rabbits is 3 : 8.

How many pigs are at the petting zoo?
Help meh

Answers

Answer:

85.3333

Step-by-step explanation:

How I got my answer:

1. 32 divided by 3 = 10.6666

2. 8 x 10.6666 = 85.3333

Hope it helps!!!

85.3333 is what i got ^

pls solve this equation pls help
[tex]\frac{5}{6}-\frac{1}{2}-\frac{1}{6}[/tex]

Answers

1/6
Because 5/6-3/6 is 2/6 and then -1/6 is 1/6
The correct answer is 1/6

10 points each question :)
Please help, I don't really understand these :-(

Answers

answer is b
you welcom and i hope this helps
I think it’s b. I’m not to sure. I hope it helps

Two identical square tables are combined to create a rectangular table, as shown. A third identical square table will be added to create a longer rectangular table. Which expression reveals the number of chairs along each side of the longer rectangular table

Answers

Answer:

456 chairs

Step-by-step explanation:

If there are 6 round tables with 7 chairs each you would multiply 7, 6 times (7 x 6) = 42

If there are 23 rectangular tables with 18 chairs each you would multiply 18, 23 times. ( 18 x 23) = 414

Then you add up all the chairs, 456 chairs total.

If I'm wrong I'm so sorry

if I'm right Thank you (brainliest plz)

456 chairs the guy above me has explanation

I’ll give brainliest to the right answer HELP!!

Answers

Answer:

2

Step-by-step explanation:

Slope is your rate of change.

answer: 2

explanation: 2x is the slope, and the slope is your rate of change!

pls brain:)

Please help! I'm really confused and this is due in 30 minutes!

SIMPLIFY the expressions.
1: 6(x+4)+1 =
2: 7(8+4k)+12 =
3: 7y+6−1+12y =
4: 4d+9−d−8 =
5: 2v+8v−5v =
6: 2.7(w−5.2) =

Answers

Answer:

1. 6x + 25

2. 60 + 28k

3. 5 + 19y

4. 3d + 1

5. 5v

6. w - 14.04

Step-by-step explanation:

These are what I got. I'm very sorry if I'm wrong.

The Smiths spend 8% of their budget on entertainment. Their total budget this year is $2,000 more than last year, and this year they plan to spend $3,360 on entertainment. What was their total budget last year?

Answers

Answer:

46000

Step-by-step explanation:

cuz I did the math

3360/0.08= 42000
42000+2000= 42000-2000=40000
Their total budget last year was $40000

A ferris wheel can accommodate 45 people every 20 minutes. How many people would the ferris wheel accommodate in 2 hours?

Answers

it can accommodate 270 people!

It is 270 people

Hope I helped

these are shout outs to Michael baker and Kylie and Skyah baker

Answers

Answer:

Michael baker and Kylie and Skyah baker

Step-by-step explanation:

Answer:

ok...

Step-by-step explanation:

louis saved 25% of his monthly paychecks last week, his paycheck was $1,000. how much money did louis save

Answers

Answer:250%

Step-by-step explanation:

25 is a quarter of 100, there for adding a zero gives u the answer

250%
hope this helps!

Eviana is 4 feet 7 inches. Ms. Maher is 5 feet 11 inches. How many INCHES
taller is Ms. Maher than Eviana?!?!?

Answers

16 inches taller. extra characters annchsjsj

Answer:

71 - 55 = 16

Step-by-step explanation:

You take the feet and turn them into inches then subtract the smaller equation from the larger equation.

Last Answer

Need help on this! If you help that'd be great!

Answers

D is the correct answer!
a is the correct answer becaus for every 5 right answers there is 1 wrong

A map of a park has a scale of 1 inch to 1,000 feet. Another map of the same park has a scale of 1 inch to 500 feet. Which map is larger? Explain or show your reasoning

Answers

The first map of 1 inch to 1000 ft is larger because it is scaled 2 times more than the second map of 1 inch to 500 ft

Answer:

1 inch to 1000 ft is larger because it is scaled 2 times more than the second map of 1 inch to 500 ft

Step-by-step explanation:

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