You found 6.60 on the ground at school, alpl in nickels, dimes, and quarters. you have twice as many quarters as dimes and 42 coins in all. how many of each type of coin do you have?

Answers

Answer 1
Let the number of nickel coins be n, the number of quarter coins be q and the number of dimes be d.

We know that 1 nickel= $0.05, 1 dime= $0.1 and 1 quarter= $0.25,


We found $6.60 means that : i) 0.05n+0.1d+0.25q=6.60

we have 42 coins in all mean: ii) n+d+q=42

we have twice as many quarters as dimes mean that iii) q=2d


using the last relation we can reduce the number of unknowns by writing all
q's in terms of d's as follows:

i) 0.05n+0.1d+0.25q=6.60
ii) n+d+q=42

substitute q with 2d:

i) 0.05n+0.1d+0.25(2d)=6.60
ii) n+d+(2d)=42

i) 0.05n+0.1d+0.5d=6.60
ii) n+d+2d=42


i) 0.05n+0.6d=6.60
ii) n+3d=42

multiply the second equation by -0.2, to eliminate the d's:

i) 0.05n+0.6d=6.60
ii) -0.2n-0.6d=-8.4
---------------------------

i+ii)  

-0.2n+0.05n=6.60-8.4
-0.15n=-1.8
n=-1.8/(-0.15)=12

substitute in i):

0.05n+0.6d=6.60
0.05*12+0.6d=6.60
0.6+0.6d=6.60
0.6d=6.0
d=10


finally, from equation n+d+q=42:

12+10+q=42
22+q=42
q=42-22=20


Answer: # 
nickels=12, # dimes=10, # quarters=20

Related Questions

Suppose a population of 250 crickets doubles in size every 3 months. How many crickets will there be after 2 years?

Answers

12 * 2 / 3

24 / 3

8

2^8 = 256

256 × 250 = 64000
64,000 if you multiply it by every 3 months and there is 12 months and another 12 months so u would do 250*2*2*2*2. *2*2*2*2 which would equal to 64000

Jose Rodriguez's checking account had a starting balance of $1,234.56. He wrote a check for $115.12 for plumbing supplies and a check for $225.00 for a loan payment. Yesterday he deposited $96.75 in his checking account. What is Jose's current balance? A. $1,441.19 B. $1,477.93 C. $894.44 D. $991.19

Answers

First subtract the amount-withdrawals from the opening balance to get
1,234.56−(115.12+225)=894.44

After that add the amount deposited to get
894.44+96.75=991.19

So it's D

Hope it helps!

Answer:

D. $991.19

Step-by-step explanation:

He starts with $1,234.56 in his account. He has to pay for plumbing supplies, so he writes a check for $115.12 and we have to subtract that amount from his account.

Now he has $1,234.56 - $115.12 = $1,119.44

After that, he has to pay a loan so he writes a check for $225.00.

Now he has $1,119.44 - $225.00 = $894.44

Finally, he deposits $96.75 in his account, so we have to add that amount to the amount he had before.

That's $894.44 + $96.75 = $991.19

A diver needs to descend to a depth of 100 feet. She wants to do it in 5 equal descendants. How far should she travel in each descent?

Answers

She should travel 100/5  = 20 feet in each descent.

divide total distance by the number od descents they want to do it in

100 / 5 = 20

 so each one should be 20 feet

A rectangle is no more than six inches wide, and its perimeter measures 28 inches. At least how long is the rectangle?

Answers

Hello,

Assume w the wide and l the length of the rectangle.

w<6 (1)
2l+2w=28==>l+w=14==>w=14-l

(1)==> 14-l<6
==>14-6<l
==>l>8

A video game system and several games are sold for $ 576 The cost of the games is 3 times as much as the cost of the system. Find the cost of the system and the cost of the games.

Answers

The cost of the video game system is $144 and the cost of the games is $432.

Determining the costs of the video game system and the games:

Let the cost of the video game system be x, and the cost of the games be 3x since the games cost 3 times as much as the system.

The total cost is $576, so we can set up the following equation:

x + 3x = 576

Combining like terms:

4x = 576

Solving for x:

x = 576/4

x = 144

Now, we find the cost of the games:

The cost of the system is x = 144 dollars.

The cost of the games is 3x = 3 × 144 = 432 dollars.

EASY QUESTION PLEASE HELP ME!!!!!!!!



A home run hit in a professional baseball game was measured to have traveled a distance of 8.5×10^−2 miles.

Which unit of measurement is most appropriate to measure this distance?

kilometers
centimeters
inches
feet

Answers

Answer:- D is the right answer. 'Feet' is most appropriate unit to measure this distance.


Explanation:-

Given distance =.

[tex]=8.5\times10^{-2}\text{ miles}=\frac{8.5}{100}\text{ miles}=0.085\text{ miles}[/tex]

We know that the units of length near to the mile is kilometers and feetsuch that 1 mile = 1.6093 km

1 mile = 5280 feet

Thus 'feet' is most appropriate unit to measure this distance.

Then the given distance[tex]=0.085\text{miles}=0.085\times5280\text{ feet}=448.8\text{ feet}[/tex]



What are the intercepts of 7x+2y-14z=56

Answers

The intercept of this would be (10,0), and (0,35).

A class has 12 boys and 18 girls. the class as a whole has a gpa (grade point average) of 2.88, and the boys have a gpa of 2.52. what is the gpa of the girls?

Answers

3.12 First, write an equation to express what you know. g = number of girls b = number of boys b * 2.52 + g * x = 2.88(b+g) Solve for x, first substitute known values for g and b 12 * 2.52 + 18 * x = 2.88(12+18) Add and multiply what you already know 30.24 + 18x = 86.4 Subtract 30.24 from both sides 18x = 56.16 Divide both sides by 18 x = 3.12 Therefore the GPA of the girls is 3.12

Write the equation of the line that is parallel to 2x=1-3y and passes through (9,4).

Answers

 2x=1-3y 
3y = -2x + 1
y = -2/3x + 1/3
so slope = -2/3

parallel  lines, same slope so slope is also equal -2/3
passes through (9,4)
y = mx + b
b = y - mx
b = 4 - (-2/3)(9)
b = 4 +6
b = 10

equation
y = -2/3(x) + 10

The relationship between parallel lines is that they have the same slope. The equation of the line that is parallel to [tex]2x = 1 - 3y[/tex] and passes through (9,4) is [tex]y=\frac 23x -2[/tex]

Given that:

[tex]2x = 1 - 3y[/tex]

First, we make y the subject

[tex]2x - 1 = 3y[/tex]

Divide both sides by 3

[tex]y = \frac 23x - \frac 13[/tex]

A linear equation is represented as:

[tex]y = mx + b[/tex]

Where:

[tex]m \to slope[/tex]

So, by comparison:

[tex]m = \frac 23[/tex]

Parallel lines have the same slope.

So the slope of the line that passes through (9,4) is [tex]m = \frac 23[/tex]

The equation is then calculated as:

[tex]y = m(x - x_1) + y_1[/tex]

Where:

[tex]m = \frac 23[/tex]

[tex](x_1,y_1) = (9,4)[/tex]

So, the equation becomes:

[tex]y = m(x - x_1) + y_1[/tex]

[tex]y = \frac 23(x - 9) + 4[/tex]

Expand

[tex]y = \frac 23x - 2 \times 3+ 4[/tex]

[tex]y=\frac 23x - 6 + 4[/tex]

[tex]y=\frac 23x -2[/tex]

Hence, the equation of the line that is parallel to [tex]2x = 1 - 3y[/tex] and passes through (9,4) is [tex]y=\frac 23x -2[/tex]

Read more about equation of parallel lines at:

https://brainly.com/question/402319

Becky bought seven more packages of dried apples than dried apricots. If she bought fifteen of these two fruits all together, how many of each did she buy.

Answers

she bought 15 bags of dried apples and 8 bags of dried apricots

Becky bought 6 dried apples and 4 dried apricots if Becky bought seven more packages of dried apples than dried apricots. If she bought fifteen of these two fruits altogether.

What is a linear equation?

It is defined as the relation between two variables, if we plot the graph of the linear equation we will get a straight line.

If in the linear equation, one variable is present, then the equation is known as the linear equation in one variable.

It is given that:

Becky bought seven more packages of dried apples than dried apricots.

Let x be the number of dried apples

Let y be the number of dried apricots

x = y + 7

She bought fifteen of these two fruits all together

x + y = 15

The above two equation represents the linear equation in two variables, solving the linear equation in two variables by the substitution method:

y + 7 + y = 15

2y = 15 - 7

2y = 8

y = 8/2

y = 4

x = 4 + 2 = 6

Thus, Becky bought 6 dried apples and 4 dried apricots if Becky bought seven more packages of dried apples than dried apricots. If she bought fifteen of these two fruits altogether.

Learn more about the linear equation here:

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Kyle works at a nature observatory where they are tracking a bird's speed. He enters the distance the bird flies into cell A1 and the time it took into cell A2. Which formula should Kyle use? =A1*A2 =A1/A2 =A1*(A2+ A1) =A1+A2

Answers

a1*a2 hope this helps you :)))

Answer:

[tex]\frac{A1}{A2}[/tex]

Step-by-step explanation:

We are give that the distance travelled by the bird is A1.

And the time taken to fly this distance is A2.

Now we will find the speed with the formula mentioned below:

[tex]Speed=\frac{Distance}{time}[/tex]

Replacing Distance as A1 and Time as A2. We get speed of the bird as

[tex]\frac{A1}{A2}[/tex]

Evaluate 6j+23+k  when j=3, k=7, and l=33.
                 ______
                     l−3, 
SOLVED IT IT"S 19!

Answers

hello : 
 j=3, k=7, and l=33
 (6j+23+k)/ (l−3) = (6(3)+23+7)/(33-3) = 48/30 =8/5

Its 19 bro.

Hope this helps

~Onyx~

Jenny had $17 more than susan, and together they had enough money to buy a game for $93 and to have a pizza for $6. how much money did susan have? answer

Answers

The total amount of money that Jenny and Susan spent is the sum of the money spent for the games and pizza. That is,
                T = $93 + $6 = $99

We let x be the amount that Susan has. With this representation, the amount of money that Jenny has is x + 17. The equation that would represent this situation is,
                     x + 17 + x = 99
The value of x from the equation is 42.

ANSWER: $42. 
             

Solve the equation. (find only the real solutions. enter your answers as a comma-separated list.) x4 − 7x2 6

Answers

Can you phrase the question correctly? Do you mean x^4 - 7x^2 + 6?

For a triangle. Find the measure of angle 1 when the other 2 angles are 117 and 33.

A. 30°

B. 33°

C. 57°

D. 63°

Answers

Answer:

It is 30 exactly um. yes or no

What is m∠PTS? ??????????

Answers

The answer that I got was 15.

You start by setting the angles equal to each other, because they are verticle angles. You then distribute 11 to get 11y + 110 = 4y - 5.

You then just have to simplify, which I got -105 = -7y. 

You can multiply each side by -1 to make them positive and divide 7 by 105 to get 15.
That most be your answer : 15

Find the mean of the data set. if necessary, round to the nearest tenth 18.1, 17.9, 16.8, 18.7, 15.1

Answers

you are supposed to add all of those numbers and then divide by how many ever numbers there are.

A watermelon seed is 0.4cm long. How far would a line of 124 watermelon seeds stretch? Write your answer in meters.

Answers

distance stretched  = 0.4 *  124  =  49.6 cms

converting to meters we divide by 100:-

Answer is 0.496 meters

Point (w, z) is transformed by the rule ​(w+5, z)​. What type of transformation occurred?

a) a translation of 5 units to the left
b) a translation of 5 units down
c) a translation of 5 units to the right
d) a translation of 5 units up

Answers

I wanna say it is C, a translation of five units to the right.

Put 1/2 1.1 5/3 20 0.4 -2 and 5/8 in order

Answers

The least to greatest order is as follows:
-2, 0.4, 1/2, 5/8, 1.1, 5/3, 20
If you want greatest to least, just reverse it.

Hope this helps! :>
-2, 0.4, 1/2, 5/8, 1.1, 5/3, 20

A car rents for ​$35 per day plus 21 cents¢ per mile. if x represents the number of miles jorge drives per​ day, 35 plus+0.21x represents the cost of the rental. if jorge has ​$98 to spend for the daily car​ rental, what is the maximum number of miles he can travel per​ day

Answers

first thing you do is subtract 35 from 98 that will give you 63 then divide 63 by .21 which then gives you 300 miles

Final answer:

With a daily budget of $98 for car rental, where the rental costs $35 per day plus 21 cents per mile, Jorge can drive a maximum of 300 miles per day.

Explanation:

If Jorge has $98 to spend for the daily car rental, where the cost comprises a fixed charge of $35 and 21 cents per mile, we use the equation 35 + 0.21x = 98 to find the maximum number of miles he can travel per day, with x representing the number of miles. Subtracting 35 from both sides of the equation gives us 0.21x = 63. Dividing both sides by 0.21 yields x = 300. Therefore, Jorge can drive a maximum of 300 miles per day within his budget.

In the diagram which of the following segments is congruent to segment AB

Answers

Final answer:

To identify a segment congruent to segment AB based on the scenarios provided, one should look for shared lengths or properties of geometric figures that indicate congruence such as equal markings or vector properties.

Explanation:

The question appears to be discussing congruent segments within geometrical diagrams, likely in the context of triangles or vectors. In geometric terms, congruent segments are segments that have the same length. From the information provided, several scenarios involving congruent segments are described. For example, when two triangles within different mediums share a segment, such as AB', or when judgment is required to determine congruence, as in Asch's conformity study.

In order to determine which segment is congruent to segment AB without the accompanying diagram, one would need to look for indications of shared lengths, parallel lines, or properties of similar triangles or figures. Typically, one would look for notation such as 'equals' marks on the segments or use the properties of the specific geometric shapes given (like the properties of triangles or the rules pertaining to vectors) to identify congruent segments.

Final answer:

In the diagram, segment AB is congruent to the segment on the surface AB' which is shared by both the triangle ABB' and AA'B'.

Explanation:

In the given diagram, segment AB is congruent to the segment on the surface AB', which is shared by both the triangle ABB' inside medium 1 and the triangle AA'B' inside medium 2. This is because the angles

Gabriela works at a nearby electronics store. She makes a commission of 14\%14%14, percent on everything she sells. If she sells a camera for \$589.00$589.00dollar sign, 589, point, 00, how much money does Gabriela make in commission?

Answers

Given that Gabriela makes a commission of 14% on everything that she sells.

If she sells a camera for $589.00, her commission will be 14% of $589.00 = 0.14 x $589 = $82.46

Therefore, Gabriela will make $82.46 in commission.

The difference of a number x and 1/2

Answers

Work:
Difference (-)
Of x and 1/2
Answer: x-1/2

The required equation is x - 1/2 .

It is required to find the equation.

What is algebra?

A part of mathematics in which letters and other general symbols are used to represent numbers and quantities in formulae and equations.

Given:

According to given question we have,

The difference of a number x and 1/2 is

x - 1/2

Therefore, the required equation is x - 1/2 .

Learn more details about algebra here:

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Why is it not reasonable to say that 4.23 is less Than 4.135 because 4.23 Has fewer Digits After The decimal Point Than 41.35?

Answers

No because 4.23 is more than 4.135
It’s not reasonable to say that 4.23 is less than 4.135 because if you would round 4.135 to the nearest 10th it would be 4.14 and 4.23 is larger than 4.14. Example- 4.135< 4.23

Which of these is the distance from the head of the piston not including any dishes or domes to the deck surface of the engine block?

Answers

Uh, you have to include an image if it involves one, in order for this to be answered properly.

Subtract.

(5x^2−3x−2)−(−2x^2−x+10)



Express the answer in standard form.

Answers

5x²-(-2x²) = 7x²
(-3x)-(-x) = (-3x+x)=-2x
(-2)-(10)=-12
7x²-2x-12

Final answer:

To subtract two polynomials, change the sign of the second polynomial and combine like terms. The result of subtracting (5x^2-3x-2) and (-2x^2-x+10) is 7x^2 - 2x - 12.

Explanation:

To subtract the given polynomials, (5x^2−3x−2) and (−2x^2−x+10), we need to change the sign of each term in the second polynomial and then combine like terms with the first polynomial. This is similar to subtracting negative numbers, where subtraction turns into addition when the number being subtracted is negative.

The subtraction process step-by-step is as follows:

Change the signs of the second polynomial: +2x^2 + x - 10

Add the results to the corresponding terms in the first polynomial:

5x^2 + 2x^2 = 7x^2

−3x + 1x = −2x

−2 − 10 = −12

So the answer to the subtraction in standard form is 7x^2 − 2x − 12.

What is the value of the dependent variable if the value of the independent variable is –1?
f(x) = 8x^5+2x

A. –10
B. 6
C. –6
D. 10

Answers

X=-1
F(x) =8(-1)^5+2(-1)
=-8-2=-10

How to find the domain and range of a function

Answers

The domain are the x-values and the range are the y-values

You put $150 in a bank account that offers a 1% interest rate, compounded annually. How much will you have after 10 years?

Answers

[tex]\bf \qquad \textit{Compound Interest Earned Amount} \\\\ A=P\left(1+\frac{r}{n}\right)^{nt} \quad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{original amount deposited}\to &\$150\\ r=rate\to 1\%\to \frac{1}{100}\to &0.01\\ n= \begin{array}{llll} \textit{times it compounds per year}\\ \textit{annually, thus once} \end{array}\to &1\\ t=years\to &10 \end{cases} \\\\\\ A=150\left(1+\frac{0.01}{1}\right)^{1\cdot 10}[/tex]
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