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3 years ago

What is r + 3/4 = 7/8

Mathematics

1 answer:

Tom [10]3 years ago

7 0

Answer:

r + ¾ = ⁷/₈

r = ⁷/₈ - ¾

⁷/₈ - ⁶₈ = ¹/₈

r = ¹/₈

Step-by-step explanation:

but my original answer was 4/4

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It is estimated that 30% of households own a riding lawn mower. A sample of 12 households is studied. What is the standard devia

dlinn [17]

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3 years ago

A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated

Alja [10]

Answer: 554

Step-by-step explanation:

Formula we use to find the sample size :

$n=(\dfrac{z_{\alpha/2}\cdot\sigma}{E})^2$

Given : Standard deviation : $\sigma=3\ hour$

Margin of error : E=one quarter hour = 0.25 hour

Two-tailed , Critical value use for 0.95 degree of confidence: $z_{\alpha/2}=1.96$

i.e. $n=(\dfrac{(1.96)\cdot(3)}{0.25})^2=553.1904\approx554$

Hence, the required sample size = 554

i.e. 554 executives should be surveyed.

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3 years ago

Does prime factorization rename a composite number as the product of prime factors

melamori03 [73]

Yes. Prime factorization breaks a composite number into the product of all of the prime factors which 'compose' the number.

7 0

3 years ago

Read 2 more answers

What is the inverse of x^2-4x+5

lisabon 2012 [21]

we are given

$f(x)=x^2-4x+5$

Since, we have to find inverse of this function

step-1: we set f(x)=y

$y=x^2-4x+5$

step-2: switch x and y

$x=y^2-4y+5$

step-3: Solve for y

$y^2-4y+(5-x)=0$

now, we can use quadratic formula

$y=\frac{4+\sqrt{4^2-4(5-x)} }{2}$

$f^{-1}(x)=\sqrt{x-1}+2$

$f^{-1}(x)=-\sqrt{x-1}+2$ ..............Answer

6 0

3 years ago

How do you put the sentence "5 thumb drives have 9 gigabytes more capacity than 1 compact disk." into a linear equation?

drek231 [11]

Well, we should first decide on our variables. Let's replace "thumb drives" with the letter "t", and "compact disk" with the letter "c".

Now, to understand the sentence. "5 thumb drives have 9 gigabytes more capacity than 1 compact disk." So, what does that mean? Well, if a compact disk has 10 gigabytes of capacity, then I suppose 5 thumb drives would have 19 gigabytes of capacity all together. So, we're just adding +9.

Alright, so as a linear equation:
"5 thumb drives have 9 gigabytes more capacity than 1 compact disk"
5t = c + 9

4 0

3 years ago