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g100num [7]
3 years ago
9

I will mark BRAINLIEST for the right and well explained answer!

Mathematics
2 answers:
Mademuasel [1]3 years ago
7 0

The three interior angles of any triangle add to 180 degress.  Therefore,


180-(120 + 40) = the third angle.


So, 20 is the third angle

vlabodo [156]3 years ago
3 0

Answer: 20°

<u>Step-by-step explanation:</u>

1. B = 120°, C = 40°             1. Given

2. A + B + C = 180°             2. Triangle Sum Theorem

3. A + 120° + 40° = 180°      3. Substitution Property

4. A + 160° = 180°                4. Simplify (added like terms)

5. A = 20°                            5. Subtraction Property of Equality

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there are 12 students who play the clarinet and 16 students who play the viola. what does the ratio 16:12 describe?​
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Answer: The ratio 16:12 describes the ratio of the number of students who play the viola to the students who play the clarinet.

Step-by-step explanation:

Given : Number of students who play the clarinet= 12

Number of students who play the viola=16

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Since, the number '12' is representing " students who play the clarinet" and  number '16' is representing  " students who play the viola"

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Explanation:

The expression is given below as

|a+5|=-5-a

Concept:

We will apply the bsolute rule below

\begin{gathered} if|u|=a,a>0 \\ then,u=a,u=-a \end{gathered}

By applying the concept, we will have

\begin{gathered} \lvert a+5\rvert=-5-a \\ a+5=-5-a,a+5=5+a \\ a+a=-5-5,a-a=5-5 \\ 2a=-10,0=0 \\ \frac{2a}{2}=\frac{-10}{2},0=0 \\ a=-5,0=0 \end{gathered}

Hence,

The final answer is

a\leq-5

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