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professor190 [17]
3 years ago
11

I am not sure of the answer which one of the option is it?

Mathematics
1 answer:
Aneli [31]3 years ago
6 0

Step-by-step explanation:

well, there are a few things you have to burn into your brain for all times. one of these is : the sum of all angles in a triangle is always 180 degrees. it does not matter what type of triangle it is. the sum is always 180 degrees.

so,

180 = A + 80 + 40

60 degrees = A

so, B. is the right answer.

You might be interested in
-4y=-20x+40<br> y+10=5x
mart [117]

Answer:

infinitely many solutions

Step-by-step explanation:

We want to find solution to the system:

-4y=-20x+40

y+10=5x

We make y the subject in the second equation to get;

y=5x-10

We substitute y=5x-10 into the top equation to get:

- 4(5x - 10) =  - 20x + 40

We expand to obtain;

- 20x  + 40=  - 20x + 40

This implies that:

40 = 40

Therefore the system has infinitely many solutions.

8 0
3 years ago
I need help asap!! Will mark the brainliest of correct!
Anettt [7]

Answer:

15.81

Step-by-step explanation:

7 0
3 years ago
40 PTS!!How many possible outcomes exist when four fair coins are flipped? 2 4 8 16
Mamont248 [21]

Answer:

16

Step-by-step explanation:

4 coins 2 out comes each

2 X 2 X 2 X 2 = 16

2^4 = 16

Hope i helped you

3 0
3 years ago
You do not need to flip the inequality sign when solving the following -5 ≤ 4r + 3.
Deffense [45]
Yes.

For inequality equation, you only flip the sign when you divide a negative number into both sides, here you will divide 4 on each side, so you won't flip the sign.
7 0
3 years ago
Read 2 more answers
Find a. Round to the nearest tenth:
Ulleksa [173]

Step-by-step explanation:

In the following triangle, a= ? , b= 2cm.

m<B= 105° , m<C = 15° ,m< A =?

Now, we know that sum of the interior angles of the triangle = 180°

m<B+m<C +m< A =180°

105°+15°+m< A=180°

m< A= 180- 120° = 60°

\frac{ \sin( A) }{a}  =  \frac{ \sin(B) }{b}

\frac{ \sin(60) }{a}  =  \frac{ \sin(105) }{2}

a =  \frac{ \sin(60) }{ \sin(105) }  \times 2

a = 1.79

a = 1.8

6 0
3 years ago
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