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Juliette [100K]
3 years ago
9

Variable y varies directly with variable x, and y = 6 when x = 20.

Mathematics
1 answer:
-BARSIC- [3]3 years ago
7 0
In a direct proportion, the equation can be set up as
y = kx
k = y/x
k = 6/20
k = 0.3
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Find two consecutive odd integers such that the square of the first added to 3 times the second, is 24. Part a: Define the varia
fgiga [73]

Given:

There are two consecutive odd integers such that the square of the first added to 3 times the second, is 24.

To find:

Part a: Define the variables.

Part b: Set up an equations that can be solved to find the integers.

Part c: Find the integers.

Solution:

Part a:

Let x be the first odd integers. Then next consecutive odd integer is x+2, because the difference between two consecutive odd integers is 2.

Part b:

Square of first odd integers = x^2

Three times of second odd integers = 3(x+2)

It is given that the sum of square of first odd integers and three times of second odd integers is 24. So, the required equation is:

x^2+3(x+2)=24

Part c:

The equation is:

x^2+3(x+2)=24

It can be written as:

x^2+3x+6=24

x^2+3x+6-24=0

x^2+3x-18=0

Splitting the middle term, we get

x^2+6x-3x-18=0

x(x+6)-3(x+6)=0

(x-3)(x+6)=0

x=3,-6

-6 is not an odd integer, so x=3 and the first odd integer is 3.

Second odd integer = x+2

                                  = 3+2

                                  = 5

Therefore, the two consecutive odd integers are 3 and 5.

8 0
3 years ago
Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6. a. What i
MrMuchimi

Answer:

0.0668, 0.0440, 92, 5000, 80

Step-by-step explanation:

a. First calculate the z-score:

z = (x - μ) / σ

z = (71 - 80) / 6

z = -1.5

Now we use a calculator or z-score table to find P(z<-1.5).

P(z<-1.5) = 0.0668

b. Again, we calculate the z-scores:

z = (x - μ) / σ

z = (89 - 80) / 6

z = 1.5

z = (x - μ) / σ

z = (92 - 80) / 6

z = 2

Using a calculator or z-score table, we want to find P(1.5<z<2).  Which is equal to P(z<2) - P(z<1.5).

P(z<2) - P(z<1.5)

0.9772 - 0.9332

0.0440

c. This time we want to go backwards.  We need to find the z score such that P(z>?) = 0.0250.  Or P(z<?) = 1 - 0.0250 = 0.9750.  According to the table, z = 1.96.

Now finding the x value that gives us that z-score:

z = (x - μ) / σ

1.96 = (x - 80) / 6

11.76 = x - 80

x = 91.76

Since scores have to be whole numbers, we round up to 92.

d. From part b, we know the z-score for this is 1.5, and that P(z<1.5) = 0.9332.  That means that P(z>1.5) = 1 - 0.9332 = 0.0668.

So if 334 scores make up 6.68% of all scores, then the number of students who took the exam is:

0.0668 N = 334

N = 5000

e. For a normal distribution, the median is also the mean.  80.

5 0
4 years ago
0.54 divide 0.03 please Help <br>D:
Helga [31]
It would be 18 I'm sure
4 0
3 years ago
Read 2 more answers
Help!! I'm super confused and I was on vacation for this chapter
aalyn [17]
I hope this helps you

4 0
3 years ago
How to convert 3,090 grams to kilograms
Art [367]
There are 1,000 grams in a kilogram. 
3090/1000=3.09
So, there are 3.09 kilograms in 3090 grams.
8 0
4 years ago
Read 2 more answers
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