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Rus_ich [418]
3 years ago
13

dennis mowed his next door neighbors lawn for a handful of dimes and nickels, 80 coins in all. upon completing the job he counte

d out the coins and it came to 6.60. how many of each coin did he earn?
Mathematics
1 answer:
Serggg [28]3 years ago
7 0

Answer:

52 dimes and 28 nickels

Step-by-step explanation:

n = number of nickels

d = number of dimes

n+d = 80   the number of coins he got

Multiply the number of nickels times .05 plus the number of dimes times .10 to equal the amount of money he got

.05n + .10d = 6.60

Divide this equation by .05

.05n/.05  + .10/.05 = 6.60/.05

n + 2d = 132

n+d = 80

Multiply by -1

-n-d=-80

Add this to n+2d = 132

n+2d=132

-n-d=-80

-------------------

d = 52

Now we need to solve for n

n+d = 80

n+52 = 80

Subtract 52 from each side

n+52-52= 80-52

n = 28


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Mariana [72]

<u>Answer</u>

D


<u>Explanation</u>

9⁽¹/²⁾² =  (9⁽¹/²⁾)²

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The correct simplification is D.

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4 years ago
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Answer:

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Step-by-step explanation:

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3 years ago
The graph shows the quadratic function f(x) . What is the average rate of change for the quadratic function from x = 6 to x = 8?
vodomira [7]
The rate of change is -1
7 0
3 years ago
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Suppose two $20 bills, three $10 bills, one $5 bill, and seven $1 bills are placed in a bag. If you were to pull a bill at rando
Korolek [52]

Answer:

Assuming that the $1 bill was pulled at random, then the expected value of the amount chosen is \frac{7}{13}.

Step-by-step explanation:

From the given question, the bag contains;

$1 bill = 7

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$10 bill = 3

$20 bill = 2

Total number of bills in the bag = 13

Pulling a bill at random, the bills would have an expected value as follows:

For $1 bill, the expected value = \frac{7}{13}

For $5 bill, expected value = \frac{1}{13}

For $10 bill, expected value = \frac{3}{13}

For $20 bill, the expected value = \frac{2}{13}

Assuming that the $1 bill was pulled at random, then the expected value of the amount chosen is \frac{7}{13}.

6 0
3 years ago
The area of the rhombus is 20 square inches. What is x?
maw [93]

1/3 ft. = 4 inches
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The answer is 5 inches.

Hope this helps.
3 0
3 years ago
Read 2 more answers
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