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Oksanka [162]
3 years ago
5

If y varies inversely as the square of x and y=4 when x=5, find y when x is 2

Mathematics
1 answer:
Len [333]3 years ago
5 0

need to kind K

Y=k x 1/x^2 = k/x^2

Find K when y=4 & x=5

Y=k/x^2 =

4=k/5^2=

4=k/25

K=4*25 =100

When x = 2

Y=100/2^2

Y=100/4

Y=25


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Grace [21]
20x+5y=120
10x+7.5y=80    multiply this one by 2
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20x+15y=160   subtract 

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             y=4         

20x+5(4)=120   plug 4 in for y in the first equation 
20x+20=120     multiply 
20x=100           subtract 
x=5                   divide to find x




 
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3 years ago
There're some old video games you sell on Ebay for $6, $7 and $9. The titles include " The Pirates", "Under the sea" and "The dr
Semenov [28]

Answer:

2/9

Step-by-step explanation:

lets create a sample space

so

the pirates can be sold for $7 $6 or $9

        p

6       7      9

under the sea can be sold for $6 $7 or $9

                              S

                        6,  7,  9

driving test can be sold for $6 $7 or $9

                            D

                   6, 7, 9

here are all the combinations:

p,6

p,7

p,9

s,6

s,7

s,9

d,6

d,7

d,9

since out of 9 combinations driving test is the only one that is not water related lets look at that. There are only 2 combinations of driving test which are less than or equal to $7, (d,7 and d,6) hence the probability of selling no water games for  less than $7 is 2/9

3 0
3 years ago
Read 2 more answers
Who ever get this correct for me THANK YOU!!!!! Make sure you put them in ALL CAPS LETTERS PLS and You'll never get points from
Semmy [17]

Answer:

DHGB

======================

1. D

  • -4x + 2y = 8 ⇒ -2x + y = 4 ⇒ y = 2x + 4
  • Parallel line has same slope of 2
  • y = 2x - 5

2. H

  • Slope is: (2-4)/(3-(-3)) = -2/6 = -1/3
  • Perpendicular line has negative reciprocal slope: -1/3 → 3
  • y = 3x - 2

3. G

  • Slope is: (2 - (-2))/(0 - (-1)) = 4/1 = 4
  • Parallel line has same lope of 4
  • y = 4x - 7

4. B

  • 3x + y = 1 ⇒ y = -3x + 1
  • Perpendicular line has negative reciprocal slope: -3 → 1/3
  • y = 1/3x + 2
3 0
3 years ago
How to Write equation of line passing through (-2,1) and (5,2) in standard form?
jasenka [17]

Answer:

y = \frac{1}{7} x + \frac{9}{7}

Step-by-step explanation:

\frac{2-1}{5-(-2)} = \frac{1}{7}

y = mx + b

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2 = \frac{5}{7} + b

\frac{9}{7} = b

6 0
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Answer:

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Step-by-step explanation:

Each container got 1/3 of the original amount, so ...

  (1/3)(1/4 gal) = 1/12 gal

Stevie put 1/12 gallon of paint in each container.

7 0
3 years ago
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