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2 years ago

9

If y varies directly as x, and y is 20 when x is 4, what is the constant of variation for this relation?

2 answers:

Mekhanik [1.2K]2 years ago

7 0

Answer:

[DATA EXPUNGED]

Step-by-step explanation:

[REDACTED]

solong [7]2 years ago

7 0

Answer:

Step-by-step explanation:their are many vbarity

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To the nearest tenth, find the perimeter of ∆ABC with vertices A(-1,4), B(-2,1) and C(2,1).

swat32

First we need to find the length of each side of the triangle , and for that we need to use the distance formula, that is
$d =\sqrt{(x_{2} -x_{1})^2 +(y_{2} -y_{1})^2}$
$AB = \sqrt{(1-4)^2 +(-2+1)^2}= \sqrt{10}$
$\sqrt{BC} = \sqrt{(1-1)^2 + (2+2)^2}=4$
Perimeter is the sum of all sides.
$Perimeter = AB + BC + AC = \sqrt{10}+4 +\sqrt{18}$
$Perimeter= 11.4$

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2 years ago

WHO CAN HELP AT LEAST ONEBOF THEM I NEED HELP ASAP

lapo4ka [179]

Answer:

9. n=-15 , 10. f=6, sorry i can't help you more I am just tired and have to get some rest but i hope this helps

Step-by-step explanation:

9. Eight less than 1/3 a number n is -13

so -13 = 1/3n -8

then

-5 = 1/3n

multiply 3 to each side

-15 = n

10. a number f multiplied by -12.3 is -73.8

so -12.3f= -73.8

divide -12.3 on each side

so f=6

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2 years ago

Pencils cost 9p each. How much would 28 pencils cost?

pickupchik [31]

Answer:

252p

Step-by-step explanation:

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2 years ago

Find the discriminant and the number of real roots for the equation.<br><br> 4x^2+12x+9=0

netineya [11]

Answer:

Step-by-step explanation:

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2 years ago

2/3(x-2)=-2<br>how would I solve this

xeze [42]

Answer:

x =(5/3)

Step-by-step explanation:

The given expression is $\frac{2}{3(x-2)} = -2$

Now to simplify it,

The first step is to cross multiply.

So, the expression becomes

$\frac{2}{(-2)} = 3(x-2)$

or, -1 = 3x - 6

⇒ 3x = -1 + 6

⇒ 3x = 5 , or x =(5/3)

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2 years ago