Answer:
B
Step-by-step explanation:
The sum of the 3 angles in a triangle = 180° , then
y + 10 + 2y + 50 = 180 , that is
3y + 60 = 180 ( subtract 60 from both sides )
3y = 120 ( divide both sides by 3 )
y = 40 → B
Answer: 18
Step-by-step explanation: The formula for circumference is 2piR. Since 2piR = 36pi, you can cancel out the pi's which makes it 2r = 36. Divide by 2 on both sides and you get r = 18.
Answer:
c 30
Step-by-step explanation:
because 30*40/100=12
Rewrite the equation as
![\sin(x) = x^2-\pi^2 = (x-\pi)(x+\pi)](https://tex.z-dn.net/?f=%5Csin%28x%29%20%3D%20x%5E2-%5Cpi%5E2%20%3D%20%28x-%5Cpi%29%28x%2B%5Cpi%29)
If we choose
, the right hand side becomes zero, and so does the left hand side.
If you graph the two functions
and
, you'll see that there are only two solutions, so the ones we found are the only ones.