7 i believeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Is there supposed to be a picture?
The probability any one system works is 0.99
So the probability of any one system failing is 1-0.99 = 0.01, so basically a 1% chance of failure for any one system
Multiply out the value 0.01 with itself four times
0.01*0.01*0.01*0.01 = 0.000 000 01
I'm using spaces to make the number more readable
So the probability of all four systems failing is 0.00000001
Subtract this value from 1 to get
1 - 0.00000001 = 0.99999999
The answer is 0.99999999 which is what we'd expect. The probability of at least one of the systems working is very very close to 1 (aka 100%)
Y = -4x + 4
x intercept is the value of x, when y = 0
y = -4x + 4
0 = -4x + 4
0 + 4x = 4
4x = 4
x = 4/4
x = 1
Therefore the x intercept is 1.
I hope this helps.