Lara tossed a fair coin 3 times. what is the probability of getting heads in the first two trials?

1 over 8

2 over 8

3 over 8

4 over 8

a. -0.3 > -0.33

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: