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kompoz [17]
3 years ago
8

3x + 2.5 = 6.1 What is x ?

Mathematics
2 answers:
vazorg [7]3 years ago
8 0

Answer:

1.2

Step-by-step explanation:

2.5 - 6.1 = 3.6

3.6 / 3 = 1.2

Natalija [7]3 years ago
6 0

Answer:x=1.2

Step-by-step explanation:

3x+2.5=6.1

3x=6.1-2.5

3x=3.6

x=1.2

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Arrange the parabolas represented by the equations in increasing order with respect to the y-values of their directrixes.
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(x-h)^2=4P(y-k), vertex is (h,k)
P is distance from vertex to directix
remember to subtract P from the y value of the vertex (p-k) and that y value is the directix, y=p-k

nut
ok so one way is to just graph them on a graphing utility
remember if the graph opens up, then the directix is below that
or we can convert to 4P(y-k)=(x-h)^2 form where P is distance from directix

I will only convert the 1st one fully, you should be able to do the rest

1. y=-x^2+3x+8
multiply both sides by -1 since we don't like the x^2 term negative
-y=x^2-3x-8
add8 to both sides
-y+8=x^2-3x
take 1/2 of linear coeficient and square it and add to both sides
-3/2=-1.5
 (-1.5)^2=2.25
-y+10.25=x^2-3x+2.25
factor perfect square
-y+10.25=(x-1.5)^2
force undistribute -1 in left side
(-1)(y-10.25)=something, we don't care anymore for now
factor out a 4 in -1
4(-1/4)(y-10.25)

k=10.25
p=-1/4=-0.25
directix=k-p=10.25-(-0.25)=10.5
directix is y=10.5

basically completee the square with x and find P by force factoring a 4 out

2.  directix: y=-1.75

3. directix: y=1.5

4. directix: y=17.25

5. d: -37.5

6. d: 9.25

7. d=2.625

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7 0
3 years ago
7 people are having dinner at a restaurant and decide to split the cheque evenly between them. If the check came to a total of $
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Answer:

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Step-by-step explanation:

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$381.50/7 = $54.5

7 0
3 years ago
Lisa wants to buy a computer, this computer costs $400, its on sale for 30% off, if you buy it before 9AM to get an additional 1
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Answer:

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3 years ago
A function is represented by the values in the table.
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Answer:

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Step-by-step explanation:

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6 0
2 years ago
Read 2 more answers
Joey has 5 collector stamps.He receives 3 more stamps each week that he completes community service hours.X=the number of weeks
kirza4 [7]

Answer:

Therefore the required equation is

Y=5+3X

Step-by-step explanation:

Given that , Joey has 5 collector stamps.

He gets 3 more stamps each week.

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3rd week he got (3+3+3)=3.3 stamps

Stamp that he got=( the number of week ×3)

Therefore at end of Xth week he got =(X × 3) =3X stamps

Total number of stamps that collected after x week

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Therefore the required equation is

Y=5+3X

6 0
3 years ago
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