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Westkost [7]
3 years ago
6

I could really use some help on this one 1/2(b+14)=b+14÷2

Mathematics
2 answers:
Andrej [43]3 years ago
5 0
1/2(b+14) = b + 14/2 is like writing (1/2).b + (1/2).14 = b + (14/2)
since / has higher preceddence than + and what's inside the parentheses has higher precedence than anything else, here we can't add b to 14 so we have to expand the expression
       b/2 + 7 = b + 7 (we add (-7) on both sides to eliminate 7)
<=> b/2 = b (add (-b) on both sides)
<=> b/2 - b = 0 
<=> b(1/2 - 1) = 0
<=> b.(-1/2) = 0 ((-1/2) multiplied by sthing equals 0, if we multiply two numbers and the result is 0 then at least one of the two is equal to 0, since (-1/2) isn't equal to 0 then b=0)
<=> b = 0
konstantin123 [22]3 years ago
4 0
B+14/2=b+14/2
1
they r equal
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A scale has a percent error of 7%. The scale reads the mass of a book as 450g. Which statement describes what the actual mass of
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Answer:

The actual mass of the book is between  481 . 5 g and 418 . 5 g.

Step-by-step explanation:

The mass of the book on the scale = 450 g

The percentage error in the scale = 7%

So, the actual mass of the book is 450 g ± 7%

Now, 7 % of  the mass 450 g = \frac{7}{100}  \times 450 = 31.5

⇒ 7% of 450 g = 31.5 g

Now, the Actual mass of the book =  450 g ± 31.5 g

450 g + 31.5 g   = 481 . 5 g

450 g - 31.5 g    = 418 . 5 g

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3 years ago
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tigry1 [53]
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2 years ago
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(9r^2+4r-7)+(3r^2-3r)
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Step-by-step explanation:

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Does this set of ordered pairs form a function?
zhenek [66]

Considering that each input is related to only one output, the correct option regarding whether the relation is a function is:

A. yes.

<h3>When does a relation represent a function?</h3>

A relation represents a function when each value of the input is mapped to only one value of the output.

For this problem, we have that:

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There are no repeated inputs, hence the relation is a function and option A is correct.

More can be learned about relations and functions at brainly.com/question/12463448

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