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vivado [14]
3 years ago
13

Mary Sue bought two dolls priced at 7.40 each. The tax was 0.98.She paid the clerk with a 20.00 bill. How much change should she

get back
Mathematics
1 answer:
never [62]3 years ago
7 0
7.40 x 2 + .98= 15.78 if she pays with $20 than her change will be $4.22
Hope this helps :]
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The equation for a parabola has the form y = ax^2 + bz + c, where a, b, and c are constants and aメ0. Find an equation for the pa
vova2212 [387]

Answer:

a = 2, b = -9, c = 3

Step-by-step explanation:

Replacing x, y values of the points in the equation y = a*x^2 + b*x +c give the following:  

(-1,14)

14 = a*(-1)^2 + b*(-1) + c  

(2,-7)

-7 = a*2^2 + b*2 + c  

(5, 8)  

8 = a*5^2 + b*5 + c  

Rearranging:

a - b + c = 14  

4*a + 2*b + c = -7

25*a + 5*b + c = 8

This is a linear system of equations with 3 equations and 3 unknows. In matrix notation the system is A*x = b whith:

A =

1    -1  1

4    2  1

25  5  1

x =

a  

b

c

b =

14

-7

8

Solving A*x = b gives x = Inv(A)*b, where Inv(A) is the inverse matrix of A. From calculation software (I used Excel) you get:

inv(A) =  

0.055555556 -0.111111111   0.055555556

-0.388888889 0.444444444   -0.055555556

0.555555556 0.555555556 -0.111111111

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3

So, a = 2, b = -9, c = 3

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3 years ago
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TiliK225 [7]

The answer to this question is 116.54

4 0
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Danny earned $20,000 last year This year he earned $12,000. What is the percentage difference?
Karolina [17]

Answer:

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nadezda [96]

Answer:

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Step-by-step explanation:

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Group like terms

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7 0
2 years ago
Read 2 more answers
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You have to simplify the 1/5 first.
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3 years ago
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