Solve for z and show your work please<3

z= -3

Step-by-step explanation:

-2z+3+7z= -12

5z+3= -12

5z= -12 -3

5z= -15

z= -3

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