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grigory [225]
4 years ago
8

How do you do this ​

Mathematics
1 answer:
Eduardwww [97]4 years ago
4 0

let's recall that the sum of all interior angles in a triangle is 180°, so then

\bf \stackrel{\measuredangle A}{x}+\stackrel{\measuredangle B}{(x+40)}+\stackrel{\measuredangle C}{30} ~~=~~ 180\implies 2x+70=180 \\\\\\ 2x=110\implies x=\cfrac{110}{2}\implies \stackrel{\measuredangle A}{x} = 55

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There were 287 music books and 134 science books in the store. After some books were sold there are 159 books left. How many boo
stiks02 [169]

Answer:

262 books sold

Step-by-step explanation:

This is a very vague word problem, but if it truly is just asking the amount of books sold (regardless of music or science), here's how to get the answer:

1. 287+134=421 - first you want to add together the two types of books to get the total amount of books in the store

2. 421-x=159 - create an equation and solve.

3. -x=-262 - follow order of operations and subtract 421 on both sides in order to isolate the variable

4. x=262 - divide each side by -1 to make the variable positive.

If you'd like an easier way, you can just:

1. 421-159=262 - it's easier, but my math teacher would count us wrong if we didn't do equations a specific way. Good luck!

4 0
3 years ago
Read 2 more answers
The vertex of this parabola is at (-3, 6). Which of the following could be its equation?
pishuonlain [190]
Since the vertex is at (-3, 6), the equation is given by
y = a(x + 3) + 6

Therefore, option A is the correct answer.
6 0
3 years ago
Plz help multiply and divide one step​
emmainna [20.7K]

Answer:

The value if y is -7

hope it helps you

4 0
2 years ago
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What does y equal in this algebraic equation? (grade 7) 24y+(42-6)=8
IgorC [24]

Answer:

y equals -1.16 (repeating decimal)

Step-by-step explanation:

I got the answer by first solving what is in the parentheses. 42-6=36. After this, I subtracted 36 on both sides to get the variable (y) by itself. After I did this, I had 24y = -28. So, I divided both sides by 24 (24y). The y was left by itself and -28/24=1.16 (repeating decimal).

<em><u>Therefore, y=1.16,1.17 when rounded, or -7/6 as a fraction</u></em>

6 0
3 years ago
What is true about this graph? Select all that apply.
schepotkina [342]

Answer:

E, B and A

Step-by-step explanation:

8 0
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