False it is still 50%
of course this assumes an ideal coin. in practice, after many many tosses, a slight preference becomes clear
Ok so 6x - 3y = -21
And 4x = 3y - 9
From the second equation, 4x - 3y = -9
So if you subtract the second from the first,
(6x-3y) - (4x-3y) = -21 - (-9)
So 2x = -12
x = -6
Now we know x=-6, and you can sub it back into any equation:
6(-6) -3y = -21
-36 - 3y = -21
-3y = 15
y = -5
So x=-6 and y=-5
Hope this helps
2k + 9 = 7 - 3k
2k + 9 - 7 = -3k
2k + 2 = -3k
2 = -3k - 2k
2 = -5k
-2/5 = k
k = -2/5
hope that helps, God bless!
Answer:
90
Step-by-step explanation:
Answer:
1. In triangle ABC,
AC = a = 10, BC =b= 7 and ∠ C = 90°
By cosine law,




Now, by the law of sine,



2. In triangle ABC,
∠B = 30°, AB=c=10 and ∠C = 90°
∠A = 180°-(30+90)°=60°

⇒ 
By Pythagoras,

⇒ 