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lana [24]
2 years ago
5

The variable y varies directly with x . If x=2 and y = −7, find y when x = −6.

Mathematics
2 answers:
telo118 [61]2 years ago
8 0

Step-by-step explanation:

\frac{2}{ - 6}  =  \frac{ - 7}{y}  \\ y =  \frac{( - 6) \times  (- 7)}{2}  \\ y =  \frac{42}{2}  \\  \boxed{y = 21}

<h2>21 is the right answer.</h2>
suter [353]2 years ago
7 0

Answer:

Step-by-step explanation:

X=2

Y=-7

Then if x is -6 u have to find what times 2 is -6 Which is -3.

so -7 x -3 is 21. Y is 21

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The mean of four numbers is 70. When a fifth number is included, the mean of the five numbers is 80. What is the fifth number?
Yakvenalex [24]
<h3>Answer: 120</h3>

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

Explanation:

S = sum of the first four values

S/4 = 70 since we divide the sum by 4 to get the mean of the first four values

S = 280 is the result after multiplying both sides by 4

Let x be the fifth unknown value. Adding it onto S leads to S+x = 280+x. This represents the sum of all five values.

Dividing that sum 280+x over 5 leads to the new mean 80, which leads to...

----------

(280+x)/5 = 80

280+x = 5*80

x+280 = 400

x = 400-280

x = 120

The fifth number is 120

3 0
2 years ago
There are 144 leaves on a tree outside of school. Each week the tree loses 8 leaves. How many leaves will be remaining on the tr
olga_2 [115]

Answer:

96

Step-by-step explanation:

Day 1: 144-8= 136

Day 2: 136-8= 128

Day 3: 128-8= 120

Day 4: 120-8= 112

Day 5: 112-8= 104

Day 6: 104-8=96

4 0
3 years ago
A teacher polled only the 8th grade students in English classrooms on what their favorite color is. She found that the favorite
amid [387]

Answer:

This is a biased sample.

Step-by-step explanation:

This is because she gave a random sample, but the she had the convenience of the students being with her when she surveyed. So it'e not actually random. She could also worded the survey or gave a biased response.

4 0
2 years ago
A ball is dropped from a 32-foot wall. Each time it bounces, it rises half as high as the distance it fell. The ball is caught w
Angelina_Jolie [31]

Answer:

I'm very trick one but I will get back to you

7 0
1 year ago
Read 2 more answers
Pls help with this ..its to be submitted this monday.....pls pls pls
Svet_ta [14]

Answer:

9pr = 2q^2

Step-by-step explanation:

28.

px^2 + qx + r = 0

If one root is A then the other root is 2A

We have A + 2A = -q/p   and A*2A = r/p

So 3A = -q/p  so A = -q/3p and  A^2  = r/2p  so A = √ (r / 2p)

Equating  these 2 equations:-

-q/3p =  √(r / 2p)

q^2 / 9p^2 = r / 2p

9p^2r = 2pq^2

9pr = 2q^2   (answer)


6 0
3 years ago
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