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3 years ago

Which expression has a negative value?

Mathematics

2 answers:

cupoosta [38]3 years ago

8 0

Answer: - 35 divided by 5

Step-by-step explanation:

katen-ka-za [31]3 years ago

4 0

Answer:

Negative 35 divided by 5.

Step-by-step explanation:

I got this answer by using process of elimination. So let's try it shall we?

2+12

This has to positive numbers in the process of addition so this would be a positive number with the answer of 14.

-3 x -8

This equation has two negatives being multiplied by each other hence cancelling each other out so the answer would be positive.

10 - (-18)

Much like the last equation there are to negatives, but this equation is subtracting by a negative so the negatives next to each other in that way would cancel each other out leaving you with a positive 28.

-35 / 5

Seeing as we have checked every other equation this one must be negative but lets check. When you divide a negative by a positive the positive would automatically take the form of the negative number, because it does not have a negative of its own to cancel the negative out so this must have a negative outcome.

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Suppose y varies directly with x and y=20 when x = 10. What is the value of y<br> when x = 30?

S_A_V [24]

Answer:

y = 60

Step-by-step explanation:

Given that y varies directly with x then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition y = 20 when x = 10, then

20 = 10k ( divide both sides by 10 )

2 = k

y = 2x ← equation of variation

When x = 30, then

y = 2 × 30 = 60

7 0

3 years ago

Angles plz help and plz explain in full detail for both of them

inna [77]

For #12, they are vertical angles so 4x=84 degrees. Therefore you take 84 and decide by 4 and you get what x is (it’s 21)

6 0

3 years ago

Read 2 more answers

What is 5/6 of 15 in simplest form.

aksik [14]

12 1/2 because you do 5/6 x 15/1 which 6/3 equals 2 and 15/3 equals 5 so you do 5/2 x 5/1

6 0

3 years ago

Willian and Amy are stuffing envelope for a charity today, William stuff a total of 70 envelope. This is 10 more than twice the

LiRa [457]

Answer:

because it is 10 major then we remove those ten and it gives us 60 that between 2 is 30 :))

7 0

3 years ago

2. The average score of all golfers for a particular course has a mean of 75 and a standard deviation of 4.5. Suppose we going t

stiv31 [10]

Answer:

$P(\bar X>76)$

And we can use the z score formula given by:

$z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}$

And if we find the z score for 76 we got:

$z =\frac{76-75}{\frac{4.5}{\sqrt{81}}}= 2$

And if we use the complement rule and the normal standard distribution or excel we got:

$P(Z>2) = 1-P(Z$

And we can find this using the ti 84 with the following code:

1-normalcdf(-1000, 76, 75, 0.5 )

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".

Solution to the problem

Let X the random variable who represent the score of golfers. We select a sampel size of 81.

From the central limit theorem we know that the distribution for the sample mean $\bar X$ is given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

And we want to find this probability:

$P(\bar X>76)$

And we can use the z score formula given by:

$z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}$

And if we find the z score for 76 we got:

$z =\frac{76-75}{\frac{4.5}{\sqrt{81}}}= 2$

And if we use the complement rule and the normal standard distribution or excel we got:

$P(Z>2) = 1-P(Z$

And we can find this using the ti 84 with the following code:

1-normalcdf(-1000, 76, 75, 0.5 )

6 0

3 years ago