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artcher [175]
4 years ago
14

Which expression is equivalent to 3-(-5)

Mathematics
1 answer:
Helen [10]4 years ago
5 0

Here is the equation:

3-(-5)

When you're subtracting a negative number from a positive number, the sign will change. The - sign will become + and the negative number becomes positive.

3- \rightarrow 3+ \\ -5 \rightarrow 5

Here is your new equation:

3+5

All you need to do is add 3 and 5.

3+5=8

That means your answer is 8.

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NEED THIS IS 30 MIN!!! DUE NOW!!! HELPPPPPPPP! PLEASEEEE!
laiz [17]

Answer:

I'm just guessing but 30 minutes

Step-by-step explanation:

2.5 minutes per mile.

Don't know if you get it wrong srry not that much of a math wiz just trying to help out.This  is only for a.I have my own physics that needs to be submitted pretty soon to so sorry if I am not helpful.Srry?:)

7 0
4 years ago
Read 2 more answers
The functions, f and g, are defined below.<br> f(x) = 2x² +5<br> g(x)=x-3<br> What is f(g( – 5))
Grace [21]

Answer:

a

Step-by-step explanation:

7 0
4 years ago
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The state education commission wants to estimate the fraction of tenth grade students that have reading skills at or below the e
irakobra [83]

Answer:

We need a sample size of at least 383.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

The margin of error is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

85% confidence level

So \alpha = 0.15, z is the value of Z that has a pvalue of 1 - \frac{0.15}{2} = 0.925, so Z = 1.44.

How large a sample would be required in order to estimate the fraction of tenth graders reading at or below the eighth grade level at the 85% confidence level with an error of at most 0.03

We need a sample size of at least n.

n is found with M = 0.03, \pi = 0.21

Then

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.03 = 1.44\sqrt{\frac{0.21*0.79}{n}}

0.03\sqrt{n} = 1.44\sqrt{0.21*0.79}

\sqrt{n} = \frac{1.44\sqrt{0.21*0.79}}{0.03}

(\sqrt{n})^{2} = (\frac{1.44\sqrt{0.21*0.79}}{0.03})^{2}

n = 382.23

Rounding up

We need a sample size of at least 383.

6 0
3 years ago
lena wants to buy a computer that costs $900 dollars. she already. has $473 dollars saved. her grandmother will pay her $7 an ho
Rama09 [41]
If you would like to know how many hours will Lena need to work before she can afford to buy the computer, you can calculate this using the following steps:

$900 - $473 = $427

$427 / $7 = 61 hours of yard work

Result: Lena will need to work 61 hours before she can afford to buy the computer.
6 0
3 years ago
Read 2 more answers
Leo has already taken 1 page of notes on his own, and he will take 1 page during each hour
sattari [20]

Answer:

49 Hours

Step-by-step explanation:

If it takes him 1 hour to finish 1 page of notes and he already finished 1, he would need to do a total of 49 hours to get 49 more pages done.

Hope this helps!

8 0
3 years ago
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