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zloy xaker [14]
3 years ago
9

Fill in the missing number? ?(3+5) = 6 + 10

Mathematics
1 answer:
gizmo_the_mogwai [7]3 years ago
6 0

Answer:

?=2 (ik i answered but i kinda want the points)

Step-by-step explanation:

first look at the problems ? x (3+5) = 6 +10

so ? x 8 = 16 so dvide 16 by 8 and you'll end up with a solid 2

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a) You are told the function is quadratic, so you can write cost (c) in terms of speed (s) as

... c = k·s² + m·s + n

Filling in the given values gives three equations in k, m, and n.

28 = k\cdot 10^2+m\cdot 10+n\\21=k\cdot 20^2+m\cdot 20+n\\16=k\cdot 30^2+m\cdot 30+n

Subtracting each equation from the one after gives

-7=300k+10m\\-5=500k+10m

Subtracting the first of these equations from the second gives

2=200k\\\\k=\dfrac{2}{200}=0.01

Using the next previous equation, we can find m.

-5=500\cdot 0.01+10m\\\\m=\dfrac{-10}{10}=-1

Then from the first equation

[tex]28=100\cdot 0.01+10\cdot (-1)+n\\\\n=37[tex]

There are a variety of other ways the equation can be found or the system of equations solved. Any way you do it, you should end with

... c = 0.01s² - s + 37

b) At 150 kph, the cost is predicted to be

... c = 0.01·150² -150 +37 = 112 . . . cents/km

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d) The graph has a minimum at 12 cents per km. This model predicts it is not possible to spend only 10 cents per km.

4 0
3 years ago
Determine the unit rate. Use mental math when you can. 6 golf balls for $15
Lena [83]

Answer:

1 golf ball : $2.50

Step-by-step explanation:

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  2. Then, you divide 5 by 2, which is 2.5
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Sav [38]

Answer:

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Step-by-step explanation:

3 0
3 years ago
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saveliy_v [14]

Answer:

z=-(51p+84)/(d+p)

Step-by-step explanation:

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