Answer:
5
Step-by-step explanation:
15a , 10b , and -7b are coefficients.
The midpoint is: (-4.5,8.5)
Isnt it letter D ? Not sure tho
Answer:
a) 
b) 
Step-by-step explanation:
Number of balls in the urn = 12
Number of white balls in the urn = 4
So, number of balls which are not white = 12 - 4 = 8
We know that probability = No. of outcomes/Total number of outcomes
Let
denotes the event of getting white ball by A, B and C
a) each ball is replaced after being drawn.
Probability = Number of white balls/Total number of balls
Solution: 
b)the balls that are withdrawn are not replaced.
Solution:
If A wins: 
If A lost and B wins: 
If A and B lost and C wins: 
and so on....
Im 100% sure that the answer is:
Given:$75
25 hours