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3 years ago

Today only a sofa is being sold at a 29% discount. The sale price is $639. What was the price yesterday?

1 answer:

7 0

What we need to do is find out what 29% of 639 is and add it to 639 to find the total. The easiest way to find a percentage of a number, if you don't know how to calculate it, is by taking 10%. So 10% of 639 is 63.9. Now since there is 29%, we need to multiply 63.9 x 2, to get 127.8. However, we only have 20% out of the 29%. So we need to find the other 9%. If 10% is 63.9, then 1% is 6.39. So we need to multiply 6.39 x 9, and that equals 57.51. Now, we need to add 127.80 and 57.51 together. That will give us 185.31. Add that to the 639, and you have your answer. Hope this helped!

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Answer:

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2 years ago

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Driving on the highway, you can safely drive 60 miles per hour. "How far can you drive in ‘h' hours?" What is the range of the f

JulijaS [17]

Answer:

D.The distance you drive

Step-by-step explanation:

If you describe this situation as function, then it will look as:

f(h)= 60h
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2 years ago

In a population of similar households, suppose the weekly supermarket expense for a typical household is normally distributed wi

Rina8888 [55]

Answer:

P(Y ≥ 15) = 0.763

Step-by-step explanation:

Given that:

Mean =135

standard deviation = 12

sample size n = 50

sample mean $\overline x$ = 140

Suppose X is the random variable that follows a normal distribution which represents the weekly supermarket expenses

Then,

$X \sim N ( \mu \sigma)$

The probability that X is greater than 140 is :

P(X>140) = 1 - P(X ≤ 140)

$P(X>140) = 1 - P( \dfrac{X-\mu}{\sigma} \leq \dfrac{140-135}{12})$

$P(X>140) = 1 - P( \dfrac{X-\mu}{\sigma} \leq \dfrac{5}{12})$

$P(X>140) = 1 - P( Z\leq0.42)$

From z tables,

$P(X>140) = 1 - 0.6628$

$P(X>140) = 0.3372$

Similarly, let consider Y to be the variable that follows a binomial distribution of the no of household whose expense is greater than $140

Then;

$Y \sim Binomial (np)$

$Y \sim Binomial (50,0.3372)$

∴

P(Y ≥ 15) = 1- P(Y< 15)

P(Y ≥ 15) = 1 - ( P(Y=0) + P(Y=1) + P(Y=2) + ... + P(Y=14) )

$P(Y \geq 15) = 1 - \begin {pmatrix} ^{50}_0 \end {pmatrix} (0.3372)^0 (1-0,3372)^{50} + \begin {pmatrix} ^{50}_1 \end {pmatrix} (0.3372)^1 (1-0,3372)^{49} + \begin {pmatrix} ^{50}_2 \end {pmatrix} (0.3372)^2 (1-0,3372)^{48} +... + \begin {pmatrix} ^{50}_{50{ \end {pmatrix} (0.3372)^{50} (1-0,3372)^{0}$

P(Y ≥ 15) = 0.763

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3 years ago

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Semmy [17]

Answer:

No, it's not.

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2 years ago

4x+6<-6 how to solve

Salsk061 [2.6K]

Answer:

The answer is below.

Step-by-step explanation:

4x<-6-6

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Inequality form:

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Interval Notion:

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Note: Turn the -8 on the sideways on the right, because its not 8.

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2 years ago

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