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Kisachek [45]
3 years ago
5

How the use a parentheses in an equation affect the answer

Mathematics
1 answer:
seraphim [82]3 years ago
5 0
Parentheses affect how equations are done.

EX. 1+1*4
4+1=5

VS

(1+1)*4
2*4=8
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Solve for y:5x-8y=40
bearhunter [10]

Solve for y means we need to isolate y from the equation:

We need to use inverse operations to solve equations:

\begin{gathered} 5x-8y=40 \\ -8y=40-5x \\ y=\frac{-5}{-8}x+\frac{40}{-8} \\ y=\frac{5}{8}x-5 \end{gathered}

3 0
1 year ago
The marketing director of a large department store wants to estimate the average number of customers who enter the store every f
Dahasolnce [82]

Answer:

36.5674\leq x'\leq61.4326

Step-by-step explanation:

If we assume that the number of arrivals is normally distributed and we don't know the population standard deviation, we can calculated a 95% confidence interval to estimate the mean value as:

x-t_{\alpha /2}\frac{s}{\sqrt{n} } \leq x'\leq x-t_{\alpha /2}\frac{s}{\sqrt{n} }

where x' is the population mean value, x is the sample mean value, s is the sample standard deviation, n is the size of the sample, \alpha is equal to 0.05 (it is calculated as: 1 - 0.95) and  t_{\alpha /2} is the t value with n-1 degrees of freedom that let a probability of \alpha/2 on the right tail.

So, replacing the mean of the sample by 49, the standard deviation of the sample by 17.38, n by 10 and t_{\alpha /2} by 2.2621 we get:

49-2.2621\frac{17.38}{\sqrt{10} } \leq x'\leq 49+2.2621\frac{17.38}{\sqrt{10} }\\49-12.4326\leq x'\leq 49+12.4326\\36.5674\leq x'\leq61.4326

Finally, the interval values that she get is:

36.5674\leq x'\leq61.4326

8 0
3 years ago
I need an example of a proportional relationship​
nikitadnepr [17]

Answer:

if you want an equation... an example could be

y=3x+5

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
10a+12=100 Can someone plz solve this
tresset_1 [31]
Im pretty sure this is the answer a=8.8
8 0
3 years ago
Read 2 more answers
5. Mr. Griffin asked the students to form the number eighty-four million, five
Dafna11 [192]

Answer:

Ben was standing in the

Step-by-step explanation:

84 000 000

+ 00 530 000

+ 00 000 216

_________________

84 530 216

From this u can see that the 3 is in the ten thousands place

7 0
2 years ago
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