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IrinaVladis [17]
3 years ago
8

Joy is planning to purchase a sweater that costs 30$ dollars at her local department store. The sweaters are on sale for for 20%

off.
Which steps are needed to find the sale price of the sweater in words?
Mathematics
1 answer:
Andrew [12]3 years ago
3 0
Since you know the price before the sale, you know that 30$ is 100%. Then you can easily find out how much money is the discount percentage: 0.3 x 20 = 6$.
Then you just have to subtract 6 (the given percent) from 30 (the actual price) and you will get <span>sale price of the sweater.</span>
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A song needs to be purchased 1,000,000 times in under a week to reach the top 10 chart. The purchase rate of Bailey's song can b
maria [59]

After 22 days and 8 hours (0.349×24 hours) and 22 minutes (0.376×60 minutes) and 34 seconds (0.56×60 ≈ 34), the number of daily hits reaches 1,000,000.

<h3>What is a function?</h3>

It is defined as a special type of relationship and they have a predefined domain and range according to the function.

It is given that the website hosting the song uses the function:

f(t)=2002t² to represent the number of daily hits over time, where t is time in days.

It is required to predict the day on which the number of daily hits reaches 1,000,000.

We have a function:

f(t)=2002t²

When f(t) = 1,000,000 then what will be the value of 't'

Simply:

1000000 = 2002 t²

499.500 = t²

t = √499.500

t= 22.349 days

t = 22 days and 8 hours (0.349×24 hours) and 22 minutes (0.376×60 minutes) and 34 seconds (0.56×60 ≈ 34).

Thus, after 22 days and 8 hours (0.349×24 hours) and 34 seconds (0.56×60 ≈ 34), the number of daily hits reaches 1,000,000.

To know more about functions follow

brainly.com/question/2833285

#SPJ1

7 0
2 years ago
what is the center of the data in the dot plot? number of science homework assignments each week. Is it 2?
nika2105 [10]
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Read 2 more answers
) How many degrees of freedom are available for hypothesis tests and confidence intervals for single regression coefficient
sladkih [1.3K]

Answer:

We use students' t distribution therefore degrees of freedom is v= n-2

Step-by-step explanation:

<u>Confidence Interval Estimate of Population Regression Co efficient β.</u>

To construct the confidence interval for β, the population regression co efficient , we use b, the sample estimate of β. The sampling distribution of b is normally distributed with mean β and a standard deviation σ.y.x / √(x-x`)². That is the variable z = b - β/σ.y.x / √(x-x`)² is a standard normal variable. But σ.y.x  is not known so we use S.y.x and also student's t distribution rather than normal distribution.

t= b - β/S.y.x / √(x-x`)² = b - β/Sb    [Sb = S.y.x / √(x-x`)²]

with v= n-2 degrees of freedom.

Consequently

P [ - t α/2<  b - β/Sb  < t α/2] = 1- α

or

P [ b- t α/2 Sb<   β  < b+ t α/2 Sb] = 1- α

Hence a 100( 1-α) percent confidence for β the population regression coefficient for a particular sample size n <30  is given by

b± t α/2 Sb

Using the same statistic a confidence interval for α can be constructed in the same way for  β  replacing  a with b and Sa with Sb.

a± t α/2 Sa

Using the t statistic  we may construct the confidence interval for U.y.x for the given value X0 in the same manner

Y~0 ± t α/2(n-2) SY~

Y~0= a+b X0

4 0
3 years ago
If (x+2,y=(4,3) find the values of x and y please help
Firdavs [7]

x = 2 & y = 3

.............................

8 0
3 years ago
Fine the value of 9-[4^2-(3+2)]​
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9-(4^2-(3+20)=9-(16-23)=9-(-7)=16

5 0
3 years ago
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