Answer: 68
Step-by-step explanation:
As per given , we have
Population standard deviation :
Critical value for 90% confidence interval =
Margin of error : E= 0.8 milligrams
The formula to find the sample size is given by :-
i.e.
Hence, the limnologist must analyze 68 samples.
Answer:
67.15
Step-by-step explanation:
Procedure:
The rate is usually given as a percent.
To find the discount, multiply the rate by the original price.
To find the sale price, subtract the discount from original price.
<span>simplified would be
</span><span>
2(x + 3)+ 8 + 5(x - 2) + 4x + 3
= 2x + 6 + 8 +5x -10 + 4x +3
= (</span>2x + 5x +4x ) + (6 + 8 -10 + 3)
=11x + 7
Answer:
45
Step-by-step explanation:
180-135=45