Answer:
4
Step-by-step explanation:
It's AoPS question
Answer:
each pack costs 2.5, she bought x packs
x=2+4+3=9
she bought 9 packs
so 2.5 times 9=22.50
she spend $22.50
Answer:
5x + 10y
Step-by-step explanation:
5x + 5y + 5y = 5x + 10y
Probability that gear 1 will fail = 5/100 (upto 10 years)
and 8/100 (after 10 years)
Probability that both will fail = 5/100 * 8/100
= 40/10000
= 0.4 %
Answer:
- 0.78
- 0.28
- 0.71
Step-by-step explanation:
I hope this is helpful.