Step-by-step explanation:
the probability of A working is 60% or 0.6, so the probability it does not work is 40% or 0.4.
the probability of B working is 90% or 0.9, so the probability it does not work is 10% or 0.1.
plan 1
it is the probabilty that either A works, or (if it is not working) B works.
0.6 + 0.4×0.9 = 0.6 + 0.36 = 0.96
plan 2
either B works, or (if it is not working) A works
0.9 + 0.1×0.6 = 0.9 + 0.06 = 0.96
both plans have the same success probability.
4 = (r-2) t
8 = (r+2) t
4 = (r-2) * [8/(r+2)]
4 = (8r-16)/ (r+2) . . .multiply by 2
4r + 8 = 8r - 16
4r = 24
r = 6
hope this helps
Answer: s= - 8/5
Step-by-step explanation:
Simplify 4-164−16 to -12−12.
-12=2+5(s+14)
−12=2+5(s+14)
2 Subtract 22 from both sides.
-12-2=5(s+14)
−12−2=5(s+14)
3 Simplify -12-2−12−2 to -14−14.
-14=5(s+14)
−14=5(s+14)
