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uysha [10]
3 years ago
15

A dozen donuts cost $4.20. How much will 1 donut cost?

Mathematics
2 answers:
CaHeK987 [17]3 years ago
5 0
$0.35 is the answer yea brainly forcing me to make it at least 20 characters.
melisa1 [442]3 years ago
3 0
You divide $4.20 by a dozen (12).
This gives you $0.35 per donut

For the next one, you divide $7 by 4 to get the individual price. This gives you $1.75 per cookie, but you still need to multiply it by 9 to get the total price of 9 cookies.
When you multiply 9 by 1.75, your final answer for the second one is $15.75.
Hope this helps :)
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X + ky = 1
Marina CMI [18]
X + k y = 1
k x + y = 1  / * ( - k )
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      x + k y = 1
- k² x - k y = - k
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x - k² x = 1 - k
x ( 1 - k² ) = 1 - k
x = ( 1 - k ) / ( 1 - k² ) = ( 1 - k ) / ( 1 - k ) ( 1 + k )
y = 1 - k( 1 - k )/( 1 - k² )
y = ( 1 - k ) / ( 1 - k² ) = ( 1 - k ) / ( 1 - k ) ( 1 + k )
a ) For  k = - 1 this system has no solution.
b ) For k ≠ - 1 and k ≠ 1, the system has unique solution:
( x , y ) = ( 1/ (1 + k) ,  1/( 1 + k ) ).
c ) For k = 1, there are infinitely many solutions.

3 0
2 years ago
A similarity transformation maps polygon ABCD to polygon PQRS. If the length of is 6 and the length of the corresponding side, ,
grigory [225]
For this case, what we must do is find the scale factor.
 We have then that the scale factor is given by:
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 Where,
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 L2: side length of polygon PQRS
 Note: both sides belong to the same side of each polygon
 Substituting the values we have:
 k = \frac{6}{12}
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The scale factor of dilation is given by:
 
k = \frac{1}{2}
3 0
3 years ago
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B
denis23 [38]

Answer:

C. 5units

Step-by-step explanation:

7 0
2 years ago
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8 0
3 years ago
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Misha Larkins [42]
                  Amanda           Billy
1st week       10                   5
2nd week      20                  10 
3rd week       30                  20
4th week       40                  40
<span>
A) Amanda's method is linear because the number of minutes increased by an equal number every week.</span>
common difference is 10.
1st week      0 + 10 = 10
2nd week   10 + 10 = 20
3rd week    20 + 10 = 30
4th week    30 + 10 = 40

Billy's method is exponential:
5(2)^x

1st week   5(2⁰) = 5(1) = 5
2nd week  5(2¹) = 5(2) = 10
3rd week   5(2²) = 5(4) = 20
4th week   5(2³) = 5(8) = 40
8 0
3 years ago
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