Answer:
B.
Step-by-step explanation:
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The only answer that has both the arrow going right ( Look at the sign) and the open dot ( less than or equal to and greater than or equal to always have an open dot) is B.
Answer:
D. 10 is your answer.
Step-by-step explanation:
If you look, the triangle is twice as small as the big one, so you take the 20 and divide by 2.
<em>20/2 = 10</em>
D. 10 is your answer.
4/5; 16/20; 24/30.
10/4; 20/8; 15/6
Answer:
Step-by-step explanation:
Since both equations have 
, we can subtract the second equation from the first to try and solve for 
:
With this, we can plug the value back into the first equation to solve for 
:
Therefore, the solution is 
Answer: the company should promote 4412 hours for these bulbs.
Step-by-step explanation:
Assuming that the lives of the bulbs are normally distributed, we would apply the formula for normal distribution which is expressed as
z = (x - µ)/σ
Where
x = lifetime of the bulbs in hours.
µ = mean hours
σ = standard deviation
From the information given,
µ = 4000 hours
σ = 200 hours
If only 2% burn out, then the company would promote 98% would meet the claimed lifetime. Looking at the normal distribution table, the z score corresponding to a probability of 0.98 is 2.06. Therefore,
2.06 = (x - 4000)/200
Cross multiplying, it becomes
200 × 2.06 = (x - 4000)
412 = x - 4000
x = 4000 + 412
x = 4412 hours
