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Eddi Din [679]
2 years ago
14

Please help on this i dont get it at all!

Mathematics
1 answer:
OverLord2011 [107]2 years ago
7 0

I hope this helps you out!!

We start off by drawing out the triangle on a graph! Placing points (x ,y) at

(-3, 5), (-5, -2) and (2, -2). I've included a screenshot of how the triangle should look to help you out visually!

From there, to find the area we use the equation, area = \frac{1}{2} b • h.

To find the base, we subtract: -5 - 2 = -7, meaning that the base equals 7.

And to find the height, we subtract: 5 - (-2) = 7, also meaning that the height equals 7 as well.

Plugging those two numbers in the equation for area, we get:

area = \frac{1}{2} 7 • 7

area = \frac{1}{2} 49

area = 24.5 or 24 1/2, in this case your answer should be B.

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oksano4ka [1.4K]
1.5 is the correct answer :)
4 0
3 years ago
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Which statement could describe the graph?
olchik [2.2K]

Answer:

C

Step-by-step explanation:

If you  look closely at the graph,

8 0
3 years ago
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Assume that SAT scores are normally distributed with mean 1518 and standard deviation 325. Round your answers to 4 decimal place
Katyanochek1 [597]

Answer:

a. 0.2898

b. 0.0218

c. 0.1210

d. 0.1515

e. This is because the population is normally distributed.

Step-by-step explanation:

Assume that SAT scores are normally distributed with mean 1518 and standard deviation 325. Round your answers to 4 decimal places

We are using the z score formula when random samples

This is given as:

z = (x-μ)/σ/√n

where x is the raw score

μ is the population mean

σ is the population standard deviation.

n is the random number of samples

a.If 100 SAT scores are randomly selected, find the probability that they have a mean less than 1500.

For x = 1500, n = 100

z = 1500 - 1518/325/√100

z = -18/325/10

z = -18/32.5

z = -0.55385

Probability value from Z-Table:

P(x<1500) = 0.28984

Approximately = 0.2898

b. If 64 SAT scores are randomly selected, find the probability that they have a mean greater than 1600

For x = 1600, n = 64

= z = 1600 - 1518/325/√64.

z= 1600 - 1518 /325/8

z = 2.01846

Probability value from Z-Table:

P(x<1600) = 0.97823

P(x>1600) = 1 - P(x<1600) = 0.021772

Approximately = 0.0218

c. If 25 SAT scores are randomly selected, find the probability that they have a mean between 1550 and 1575

For x = 1550, n = 25

z = 1550 - 1518/325/√25

z = 1550 - 1518/325/5

z = 1550 - 1518/65

= 0.49231

Probability value from Z-Table:

P(x = 1550) = 0.68875

For x = 1575 , n = 25

z = 1575 - 1518/325/√25

z = 1575 - 1518/325/5

z = 1575 - 1518/65

z = 0.87692

Probability value from Z-Table:

P(x=1575) = 0.80974

The probability that they have a mean between 1550 and 1575

P(x = 1575) - P(x = 1550)

= 0.80974 - 0.68875

= 0.12099

Approximately = 0.1210

d. If 16 SAT scores are randomly selected, find the probability that they have a mean between 1440 and 1480

For x = 1440, n = 16

z = 1440 - 1518/325/√16

= -0.96

Probability value from Z-Table:

P(x = 1440) = 0.16853

For x = 1480, n = 16

z = 1480 - 1518/325/√16

=-0.46769

Probability value from Z-Table:

P(x = 1480) = 0.32

The probability that they have a mean between 1440 and 1480

P(x = 1480) - P(x = 1440)

= 0.32 - 0.16853

= 0.15147

Approximately = 0.1515

e. In part c and part d, why can the central limit theorem be used even though the sample size does not exceed 30?

The central theorem can be used even though the sample size does not exceed 30 because the population is normally distributed.

6 0
3 years ago
Determine if the sequence below is arithmetic or geometric and determine the common difference / ratio in the simplest form 15,1
Tatiana [17]

Step-by-step explanation:

the sequence is arithmetic due to the common difference that is equal

d=11-15=7-11=-4

 a(n) = a1 +(n-1)d

a1=15

Then :

a(n) = 15+(n-1)-4

hope this helps

6 0
2 years ago
Pleas help me I have so much more left to do
Serjik [45]

Answer:

2 11/14 squared feet

Step-by-step explanation:

Area of a rectangle = length x width

Give length = 3 1/4 and

Width = 3/4

Therefore,

Area = 3 1/4 x 3/4

Change the mixed size fraction to an improperly fraction

We have A = 13/4 x 3/4

39/14

2 11/14 squared feet

6 0
3 years ago
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