Answer and Step-by-step explanation:
Let's solve this like a regular equation:
2sin(2x) - 1 = 0
2sin(2x) = 1
sin(2x) = 1/2
Replace 2x with y:
sin(y) = 1/2
What angles for y will make this true? Think to the unit circle; the possible angles are 30° and 150°.
Then, x = 30/2 = 15°or 150/2 = 75°.
(Note that none of the answer choices matches, so the problem/choices may be copied incorrectly)
So you would cross multiply the numbers.
So
m x 15 and 10 x 12
It would be set up as:
15m = 120
Just divide 15 on both sides
m = 8
15.90 would be your new answer
Answer:
option B is correct answer
Let the number be t
Then, three times the number is 3t
Less than 2
3t-2=20
