anonymous
  • anonymous
plz i need help :( Evaluate the expression if a = 1 and b = 2. fraction numerator 5 left parenthesis a star times plus 3 b right parenthesis over denominator a b end fraction A. 20 B. 5.5 C. 15 D. 17.5
Algebra
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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freckles
  • freckles
\[\frac{5( \star \cdot 3b)}{ab}\] any idea what the value we should plug in for the star ?
anonymous
  • anonymous
1
freckles
  • freckles
so you are given \[a=1, b=2, \star=1\]

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freckles
  • freckles
replace a with 1 replace b with 2 replace star with 1 then \[\frac{5( \star \cdot 3b)}{ab}=\frac{5(1 \cdot 3(2))}{1(2)}\]
anonymous
  • anonymous
no the star is a
freckles
  • freckles
oh your problem said something about a star in it
anonymous
  • anonymous
and a is 1
anonymous
  • anonymous
sorry about that
freckles
  • freckles
I'm sorry kind of confused about times plus and what that means exactly
freckles
  • freckles
can you draw the problem or is it really worded like that?
anonymous
  • anonymous
ok
anonymous
  • anonymous
|dw:1441573677006:dw|
freckles
  • freckles
\[\frac{5(a+3b)}{ab} \\ \\ \text{ okay so replace } a \text{ with 1} \text{ and } b \text{ with 2} \\ \frac{5(1+3 \cdot 2)}{1(2)}\]
freckles
  • freckles
do you know how to do 5(1+3*2) and 1(2)?
anonymous
  • anonymous
no
freckles
  • freckles
1(2)? come on you know this 2
freckles
  • freckles
1 times a is a
freckles
  • freckles
1 times 2 is 2
anonymous
  • anonymous
ok
freckles
  • freckles
5(1+3*2) here we apply order of operations what is 3*2?
anonymous
  • anonymous
6
freckles
  • freckles
ok so we have now 5(1+6)
freckles
  • freckles
1+6=?
anonymous
  • anonymous
7
freckles
  • freckles
and then whatever you get for 1+6 multiply that result by 5 so you should end up with 5 times 7
freckles
  • freckles
which is..
anonymous
  • anonymous
35
freckles
  • freckles
\[\frac{5(a+3b)}{ab} \\ \\ \text{ okay so replace } a \text{ with 1} \text{ and } b \text{ with 2} \\ \frac{5(1+3 \cdot 2)}{1(2)} \\ =\frac{5(1+6)}{2}=\frac{5(7)}{2}=\frac{35}{2}\]
freckles
  • freckles
and you are basically done just need to write as a decimal
freckles
  • freckles
since your choices are written that way
anonymous
  • anonymous
but there's no 35/2
freckles
  • freckles
yes that is why I said to write as a decimal
anonymous
  • anonymous
35.2
freckles
  • freckles
how did you get 35.2?
freckles
  • freckles
|dw:1441574329519:dw| 2 doesn't go into 3, 3 times... 2 goes into 3, 1 times
freckles
  • freckles
|dw:1441574353259:dw|
freckles
  • freckles
2 goes into 15 how many times?
anonymous
  • anonymous
oh
anonymous
  • anonymous
7
freckles
  • freckles
|dw:1441574417155:dw| and finally 2 goes into 10 how many times?
anonymous
  • anonymous
5
freckles
  • freckles
right |dw:1441574443279:dw| \[\frac{35}{2}=17.5\]
anonymous
  • anonymous
thx

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