A=180-b is same as a+b=180
because you just subtract b from both sides
You'll have to start off by finding the variables. Ex:
3(x + 3) - 2(x + 3)
As you can see here, the two similar variables are x. By using the distributive property, you will get this:
3x + 9 - 2x + 6
Next, you'll want to subtract the two variables, since 2x has a - in front of it:
1x + 9 + 6
or
x + 9 + 6
Then, you want to add the two numbers without the variable:
x + 15
Your answer is x + 15.
Hopefully that helped! :)
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Answer:</h2><h2>The probability of choosing a mystery book from the box, replacing it, and then choosing a biography =

</h2>
Step-by-step explanation:
A box of old books contains mysteries, biographies, and children’s books.
The number of books in mysteries = 6
The number of books in biographies = 4
The number of books in childrens = 2
The total number of books = 12
The probability of choosing a mystery book from the box = 
The probability of choosing a biography book from the box = 
The probability of choosing a mystery book from the box, replacing it, and then choosing a biography = (
) (
) ( since it is with replacement)
= 
The answer is (2z-3)(z+3)
Answer:
41 year old
Step-by-step explanation:
Suppose x is the total age before the ninth person joins. x/8=44 then the new persons age is a then x+a/9=47 so you subsitute x=352 then (352+a)/9=47 then 352+a=393 so we find a=41