3P2 = 3! / (3-2)! = 3*2*1 / 1 = 6 answer
Its D
Answer:
-20
Step-by-step explanation:
20 Below -> -20
Think of it as a vertical number line, where sea level is 0. Anything above is positive, and anything below is negative.
Answer:
The answer is 28.26
Step-by-step explanation:
A=pir^2
A=pi(3)^2
A=9pi
A=28.26
Hope this helps :D
Answer: C. 541.60 hours
Step-by-step explanation:
Since the lifetime of a 2-volt non-rechargeable battery in constant use has a normal distribution, we would apply the formula for normal distribution which is expressed as
z = (x - µ)/σ
Where
x = lifetime of the batteries.
µ = mean lifetime
σ = standard deviation
From the information given,
µ = 516 hours
σ = 20 hours
Looking at the normal distribution table, the z score corresponding to ninety percent approximately is 1.28
Therefore,
1.28 = (x - 516)/20
Cross multiplying by 20, it becomes
20 × 1.28 = x - 516
25.6 = x - 516
x = 516 + 25.6
x = 541.6
Therefore, Ninety percent of all batteries have a lifetime less than
541.60 hours
First you need to know its common factors.
They are: 1, 3, 5, 9, 15, 45
And 45 = 1*45 = 3*15 = 5*9
So there should be 3 ways in total
