Sin^2x - 2sinx + 1 = 0

90, 270 degrees

Step-by-step explanation:

sin(x) = a

a^2 - 2a + 1 = 0

(a-1)^2 = 0

1 = a

So...

1 = sin(x)

90, 270 = x

15% chance.

step-by-step explanation:

3/10 times, the 5 year old will get a tablet. 5/10 times, the 13 yer old will get a tablet. multiply both fractions to get 15/100 times, both would have a tablet.