Each system is independent of one another, so you multiply the probabilities of failure for each
P(A and B) = P(A)*P(B)
P(A and B) = 0.01*0.03
P(A and B) = 0.0003
Answer: Choice C
Answer:
Step-by-step explanation:
answer: you would just substitute all of the values you see for b into the equation where there's a b
A-b=21
5a-2b=18
We can use substitution here. Take the first equation and solve for A. (Picking this one because it's easy)
a = 21+b
Plugin to the second equation:5(21+b)-2b=18
Simplify: 105 + 5b - 2b = 18
Simplify: 105 + 3b = 18
Subtract both sides: 3b = 18-105
Simplify: 3b = -87
Divide: b = -29
Plug back into the first: a=21+b
a = 21 - 29
a = -8
Option D
