All categories

4 years ago

How is subtracting a

Mathematics

2 answers:

Aleks [24]4 years ago

4 0

Because when you subtract a negative number the signs cancel out and become and addition problems

miskamm [114]4 years ago

4 0

When you subtract a negative number, the two negatives cancel out and become a positive so you end up adding the number instead, exactly like when you add a number like normal

You might be interested in

PLEASE HELP!!! PLEASE HELP!!! PLEASE HELP!!! The question is in the picture.

yarga [219]

Answer:

helped

Step-by-step explanation:

7 0

3 years ago

Please answer question in picture

olchik [2.2K]

If X=-1
Then to find y you will just subsitute it to your equation.
Y=4x+4
Y=4(-1)+4
Y=-4+4
Y=0

So y=0

7 0

3 years ago

If 1/3x =10, what is 2/3x

ANTONII [103]

The answer is 6 2/3

4 0

3 years ago

Describe the characteristics of each set of numbers that make up the set of integers

earnstyle [38]

There are different types of numbers: they could be natural numbers, whole numbers, rationals, real numbers, and integers. Integers are a set of numbers consisting of positive and negative numbers excluding decimals and fractions. The following are its characteristics:

*Negative numbers mean numbers that are below zero. 

*Zero is part of the set of integers. 

*Number categories overlap with each other. 

*When writing a set of integers, they must be inside a bracket ‘{}’ and with ellipses “…”. 

*When adding or subtracting integers, use a number line.

3 0

3 years ago

Assume that the one-way commute time of an UoU student from his house to school is a normally distributed random variable which

Marizza181 [45]

Answer:

$n=(\frac{1.960(10)}{5})^2 =15.36 \approx 16$

So the answer for this case would be n=16 rounded up to the nearest integer

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

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".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma=10$ represent the sample standard deviation

n represent the sample size

ME=5 represent the margin of error

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (2)

And on this case we have that ME =5 and we are interested in order to find the value of n, if we solve n from equation (2) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (3)

The critical value for 95% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.025;0;1)", and we got $z_{\alpha/2}=1.96$ , replacing into formula (3) we got:

$n=(\frac{1.960(10)}{5})^2 =15.36 \approx 16$

So the answer for this case would be n=16 rounded up to the nearest integer

3 0

3 years ago