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lorasvet [3.4K]
3 years ago
6

Deangelo has $7 worth of dimes and quarters in a jar. He has 7 more quarters than dimes. How many of each coin does he have?

Mathematics
2 answers:
julia-pushkina [17]3 years ago
6 0
There are 22 quarters and 15 dimes
Tems11 [23]3 years ago
4 0
The kid's right it is 15 dimes and 22 quarters
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What is the maximum height of the apple equation which formula is -16x^2+56x+40
inn [45]

40; base it off of the y-intercept [C]. What is the unit of measurement?

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3 years ago
The perimeter of the triangle
Illusion [34]
Area=228 feet sqa.
Length=12 ft.
Breadth=(228/12) ft.
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8 0
3 years ago
The set of the consecutive odd numbers 1, 3, 5, 7, ... , N has a sum of 400. How many numbers are in the set?
Amanda [17]

Well, we could try adding up odd numbers, and look to see when we reach 400. But I'm hoping to find an easier way.

First of all ... I'm not sure this will help, but let's stop and notice it anyway ...
An odd number of odd numbers (like 1, 3, 5) add up to an odd number, but
an even number of odd numbers (like 1,3,5,7) add up to an even number.
So if the sum is going to be exactly 400, then there will have to be an even
number of items in the set.

Now, let's put down an even number of odd numbers to work with,and see
what we can notice about them:

         1, 3, 5, 7, 9, 11, 13, 15 .

Number of items in the set . . . 8
Sum of all the items in the set . . . 64

Hmmm.  That's interesting.  64 happens to be the square of 8 . 
Do you think that might be all there is to it ?

Let's check it out:

Even-numbered lists of odd numbers:

1, 3                                   Items = 2, Sum = 4
1, 3, 5, 7                           Items = 4, Sum = 16
1, 3, 5, 7, 9, 11                 Items = 6, Sum = 36
1, 3, 5, 7, 9, 11, 13, 15 . . Items = 8, Sum = 64 .

Amazing !  The sum is always the square of the number of items in the set !

For a sum of 400 ... which just happens to be the square of 20,
we just need the <em><u>first 20 consecutive odd numbers</u></em>.

I slogged through it on my calculator, and it's true.

I never knew this before.  It seems to be something valuable
to keep in my tool-box (and cherish always).


3 0
3 years ago
HELP THIS IS DUE IN 15 MINUTES I DONT KNOW HOW TO SOLVE IT!!!
NARA [144]

Answer:

(x,y)=(-10, -30)

Step-by-step explanation:

x/4 -y/12 = 0

--> x/4 = y/12

substitute into the first eq.

x/4 + y/12 = -5

y/12 + y/12 = -5

2y/12 = -5

y= (-5) * 12/2 = -30

solve for x, x/4 = (-30)/12

x=4* (-30)/12 = -10

8 0
3 years ago
A rental company charges $15 plus $4 per hour to rent a bicycle. if margie does not want to spend more than $27 for her rental,
Romashka-Z-Leto [24]
19 per hour
27 dollars max

1 hour and 42 minutes she can rent it.
7 0
3 years ago
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