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slava [35]
3 years ago
15

It take 10 people 46 minutes to paint 3 walls. how long will it take 4 peoplr to paint 6 walls

Mathematics
1 answer:
Anettt [7]3 years ago
6 0
10 people : 46 mins : 3 walls
 x2                               x2

20 people : 46 mins  : 6 walls
÷5                 x5
4 people   : 230mins : 6 walls.

So it takes 230 mins for 4 people to paint 6 walls.

230 mins = 3 hours and 50 mins

--------------------------------------------------------------------------------------
Answer: It takes 3 h 50 min for 4 people to paint 6 walls.
--------------------------------------------------------------------------------------
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Derive the equation of the parabola with a focus at (_5, 5) and a directrix of y = -1.
mars1129 [50]

Answer: Option D is correct.

Step-by-step explanation:

Since we have given that

focus = (-5,5)

and a directrix y= -1

Since, equation of parabola in this case will be

(x-h)^2=4.a(y-k)

Now, here

y=k-a=-1\\\\\text { focus =(h,k+a)}\\\\\text{So,} k+a=5\\\\\text{ by solving these two equation , we get }\\\\a=3\text{ and } k=2

So equation will be

(x+5)^2=4\times 3(y-2)\\\\(x+5)^2=12(y-3)\\\\y=\frac{1}{12}(x+5)^2+2

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2 years ago
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BabaBlast [244]

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4 0
2 years ago
In the triangle of ABC, D is a point on AB , AC = 7, AD = 6, and BC = 18. The length of DB could be
Ray Of Light [21]

Answer:

19 > DB > 5

Step-by-step explanation:

In a triangle Δ ABC, AC = 7, and BC = 18.

Therefore, the length of the third side of the triangle Δ ABC i.e. length of AB can have a maximum value of < (7 + 18) i.e. 25 and the minimum value of the length AB will be > (18 - 7) i.e. 11

Hence, the length of AB will be given by 25 > AB > 11.

Now, AB = AD + DB = 6 + DB {Since length of AD is given to be 6}

Therefore, 25 > 6 + DB > 11

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8 0
2 years ago
Select the correct answer Which equation represents a line that is perpendicular to line MN?
taurus [48]

Answer:

D. y = 4x - 6

Step-by-step explanation:

The equation that is perpendicular to the line MN should have a slope that when multiplied by the slope of line MN will result to negative one. Therefore,

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Using the 2 coordinates of MN let's find the slope,

(-7, 6)(5, 3)

Therefore,

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The equation that represent a line perpendicular to the line MN is

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From our formula,

4 × - 1 / 4 = - 1

So, option D meets the requirement.

6 0
3 years ago
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you can try two ways of doing it, graphing the functions or using derivatives.

since this are twelve functios the easier way is to graph them.

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