I still don’t get how to do this. Someone help me understand please

Step-by-step explanation:

You know that the x-axis is horizontal, so it has slope = 0.

Point-slope equation for line of slope 0 that passes through (-7,9):

y-9 = 0(x+7)

y = 9

blue marble is 15 times out of 50 = 15/50 reduces to 3/10

landing on tails is 24 out of 50 = 24/50 reduces to 12/25

to find the probability of both multiply together:

3/10 x 12/25 = 3 x 12 / 10 x 25 = 36/250

if you multiplied the numerator and denominator by 10 you get 360/2500.

the answer is 360/2500