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love history [14]
3 years ago
14

Miri counted her money and found that her 25 coins which were nickels, dimes, and quarters were worth $3.20. the number of dimes

exceeded the number of nickels by 4. how many coins of each kind did she have?
Mathematics
1 answer:
Natasha_Volkova [10]3 years ago
4 0
Nickels = x

dimes = x + 4

quarters = x

Value of coins:

nickel = 5 cents

dime = 10 cents

quarter = 25 cents

5x + 10(x + 4) + 25x = 3.20

5x + 10x + 40 + 25x = 320

40x = 320 - 40

40x = 280

x = 280/40

x = 7

There are 7 quarters, 7 nickels and 11 dimes.



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C. Assume someone has an average balance account with a bank that costs $35 a month but earns
Elodia [21]

Answer:

<em>The total interest earned after subtracting the monthly $35 </em>

<em>service fee = $975 - $35 = $940</em>

Step-by-step explanation:

Bank fee cost per month = $35

Interest rate per month = 1%

The total amount in the account until the 15th = $100,000

The total amount in the account from the 15th to the 30th = $95,000

Interest Earned?

<em>Interest earned for first 15 days:</em>

                               = $100,000 times 1%/2

                               = $100,000 times 0.001/2

                               = $500

<em>Interest earned from 15th to the 30th:</em>

<em>                                  </em>= $95,000 times 1%/2

                                 = $95,000 times 0.001/2

                                 = $475

Interest earned for <em>first 15 days + Interest earned from 15th </em>

<em>to the 30th =  </em>$500 + $475 = $975

So, the total interest earned after subtracting the monthly $35

service fee = $975 - $35 = $940

<em>Keywords: interest, interest rate</em>

<em>Learn more about interest calculation from brainly.com/question/3256069</em>

<em>#learnwithBrainly</em>

8 0
3 years ago
Can someone please help me with question 1, I will mark you as a brainest and I'll thank you
Leya [2.2K]
I believe it is 86.4
8 0
3 years ago
In each of the following ,make y the subject and hence find the value of y when a=2, b=3 ,and c=4.
zvonat [6]

Part i


\dfrac{2a-7}{6y} = \dfrac{3b-5}{2c}


y = \dfrac{ 2c(2a-7)}{6(3b-5)} = \dfrac{c(2a-7)}{9b-15}


Substituting,

y = \dfrac{4(2(2)-7)}{9(3)-15} = \dfrac{ -12}{12} = -1


Answer: -1


Part ii


I'm not sure that one's typed in correctly but I'll solve it as written.


3-34y + 2a = \dfrac{3b-5}{2c + 1}


34y  = 3+2a-\dfrac{3b-5}{2c + 1}


y = \frac 1 {34}\left(3+2a-\dfrac{3b-5}{2c + 1} \right)


We're not asked to simplify it so I wont. Substituting,


y = \frac 1 {34}\left(3+2(2)-\dfrac{3(3)-5}{2(4) + 1} \right) = \frac 1 {34}(7-4/9) = \dfrac{59}{306}


Answer: 59/306



3 0
3 years ago
Find the product of (x-7)^2 and explain how it demonstrates the closure property of multiplication
iogann1982 [59]

A. x²-14x+49; is a polynomial

Step-by-step explanation:

(x-7)² can be written as (x-7)(x-7)

Expanding the expression

x(x-7)-7(x-7)

x²-7x-7x+49

x²-14x+49 ⇒⇒A quadratic function, which is a polynomial of degree 2

This function demonstrates the closer property of multiplication in that the change in order of multiplication does not change the product. This is called commutative property.

(x-7)(x-7)

-7(x-7)+x(x-7)

-7x+49+x²-7x

x²-14x+49

Learn More

Polynomials :brainly.com/question/9601478

Keywords : product, closure property of multiplication,

#LearnwithBrainly

4 0
3 years ago
25/10 as a mixed number
Anvisha [2.4K]
A mixed number is an integer and a fraction that is less than one (remember that x/x = 1.) 
To simplify 25/10, calculate how many times 10 goes into 25 by dividing 25 by 10. The answer is 2 with a remainder of 5 (10 x 2 = 20, 25-20 = 5).
The mixed number is 2 and 5/10, which simplifies to 2 1/2.
6 0
3 years ago
Read 2 more answers
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