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ira [324]
3 years ago
13

How much its 5+3+3×15=

Mathematics
2 answers:
Vesnalui [34]3 years ago
8 0
You can use PEMDAS to answer this, which in the context of this question, says that "Multiplication comes before addition"

So, if we follow that, we can take it step by step:
5+3+3*15
5+3+45 = 8+45=53

Thus, 5 + 3 + 3 × 15 = 53
AveGali [126]3 years ago
7 0
=5 + 3 + 3 * 15
do multiplication first
=5 + 3 + 45
=8 + 45
=53

ANSWER: 53

Hope this helps! :)
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belka [17]

Answer:

a) y=0.00991 x +1.042  

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Step-by-step explanation:

Data given

x: 500, 700, 750, 590 , 540, 650, 480

y: 7.00, 7.50 , 9.00, 6.5, 7.50 , 7.0, 4.50

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y = mx +b

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m=\frac{S_{xy}}{S_{xx}}  

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S_{xy}=\sum_{i=1}^n x_i y_i -\frac{(\sum_{i=1}^n x_i)(\sum_{i=1}^n y_i)}{n}  

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With these we can find the sums:  

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Nowe we can find the means for x and y like this:  

\bar x= \frac{\sum x_i}{n}=\frac{4210}{7}=601.429  

\bar y= \frac{\sum y_i}{n}=\frac{49}{7}=7  

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b=\bar y -m \bar x=7-(0.00991*601.429)=1.042  

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y=0.00991 x +1.042  

Part b

The correlation coefficient is given by:

r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}  

For our case we have this:

n=7 \sum x = 4210, \sum y = 49, \sum xy = 30095, \sum x^2 =2595100, \sum y^2 =354  

r=\frac{7(30095)-(4210)(49)}{\sqrt{[7(2595100) -(4210)^2][7(354) -(49)^2]}}=0.7503  

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