1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lerok [7]
2 years ago
6

If a is an obtuse angle in a triangle and sin a = , calculate the exact value of sin 2a.

Mathematics
1 answer:
garik1379 [7]2 years ago
8 0

Answer:

Step-by-step explanation:

cos A = √( 1 - (5/13)²) = √( 1 - 25/169) = √(144/169) = - 12 /13

in 2 A = 2 sin A cos A

sin 2 A = 2 *5/13 ( - 12/13 ) = - 120 / 169

the answer is -120/169

You might be interested in
What is the equation of the line that passes through the points (−2, 1) and (1, 10)?
Viktor [21]

Answer:

3x - y = -7

Step-by-step explanation:

y = mx + b

m = deltay/deltax

m = (10 - 1)/[( 1 - (-2)]

m = 9/3 = 3

y = 3x + b

From (-2 | 1) we see that when x = -2, y = 1

Placing into the equation, in order to find b (y-intercept)

y = 3x + b

1 = 3(-2) + b

b = 7

y = 3x + 7 or 3x - y = -7

6 0
3 years ago
-3x + 1 > 22 or 4x - 5 > 15
Mazyrski [523]

Answer:

Step-by-step explanation:

5 0
2 years ago
Please help need 4 and 5 I will make brainliest , 30 points
trasher [3.6K]

She put 1/5 down which means she owes 4/5

620 * 4/5 = 496

She owes $496.00



98 - 10 = 88

She still owes $88.00

5 0
3 years ago
I’m confused on this and i just moved from schools so
Elina [12.6K]

Answer:

(-2,3)

Step-by-step explanation:

The point where two lines cross should be your answer!!!

(-2,3) is where the two lines meet/cross!!

That is the definition of a system on a graph!

-Where two lines meet/cross!!

6 0
2 years ago
FaSSSSSSTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT and thanks yall are fast
Mama L [17]

Answer:

120 degrees

Step-by-step explanation:

It's a vertical angle, meaning that it is congruent to the one on the opposite side of it.

5 0
3 years ago
Other questions:
  • Marisol bought 20 peices of ribbion for $18. what would be the cost of 30 peices of ribbon
    10·1 answer
  • A number sentence is example of which multiplication property
    5·1 answer
  • Every possible cross section of a three-dimensional figure is a circle. What is the figure?
    5·1 answer
  • Mimi needs eleven 18-inch pieces of rhinestone ribbonShe purchased 5 yards of the ribbon shown at the rightIf Mimi purchases the
    10·2 answers
  • Help please <br> explain step by step
    7·1 answer
  • I don't understand how to do these probability questions, what two fractions do I multiply to get these answers?
    12·1 answer
  • Find an equation of the circle that has center (-1,1 ) and passes through (1,-6)
    14·1 answer
  • Which is heavier: a ton of bricks or a ton of feathers (My points I still have 1600 points to gooo)
    14·2 answers
  • Please find the greatest common factor there is a picture
    7·1 answer
  • Hello I need help with this, I'll give u brainlist just please help me with this
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!