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In-s [12.5K]
3 years ago
8

HELP pls pls pls pls

Mathematics
1 answer:
Vitek1552 [10]3 years ago
6 0

Answer:

4y

Step-by-step explanation:

hrhh

rjrjrj

dnd

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Unit 2 Lesson 2 PS 1 table
deff fn [24]

Answer:

k

Step-by-step explanation:

The constant of proportionality is the ratio between two directly proportional quantities. ... Once you know the constant of proportionality you can find an equation representing the directly proportional relationship between x and y, namely y=kx, with your specific k.

8 0
3 years ago
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An ammunition producer claims his best product has an average lifespan of exactly 18 years. A skeptical product evaluator asks f
DochEvi [55]

Answer:

The 90% confidence interval for the true mean lifespan of this product is between 13.1 and 16.9 years.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 50 - 1 = 49

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 49 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.9}{2} = 0.95. So we have T = 1.6766

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 1.6766\frac{8}{\sqrt{50}} = 1.9

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 15 - 1.9 = 13.1 years

The upper end of the interval is the sample mean added to M. So it is 15 + 1.9 = 16.9 years

The 90% confidence interval for the true mean lifespan of this product is between 13.1 and 16.9 years.

8 0
2 years ago
What are a, b, c and d​
GuDViN [60]

Answer:

Step-by-step explanation:

4 g.

c=42

a=b=d

a+b+42=180

a+a=180-42

2a=138

a=138/2=69

a=69

b=69

c=42

d=69

5a.

a=30

angle O=180-(a+30)=180-(30+30)=180-60=120°

d=80

angle O=180-(d+80))=180-(80+80)=180-160=20°

central angle O of middle triangle=180-(120+20)=180-140=40°

b=c

b+c+40=180

b+b=180-40

2b=140

b=140/2=70

b=70°

c=70°

7 0
2 years ago
PLEASE HELP WILL MARK BRAINLIEST THANK YOU
Papessa [141]

Answer:

Step-by-step explanation:

if n is a positive integer then 4^n has last digit 4 or 6

we choose any number having 4 digits whose sum is divisible by 3 and last digit is 4 or 6.

1014,1026,1104 etc.

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2 years ago
A store had a vending machine. Customers put in a quarter, and they receive a handful of candy.The machine is profitable if x &g
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x has to be a bigger number than forty because the allitgator eating the bigger number which is x so that mean x is a bigger number than 40.

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