38 tens would mean 10 x 38= 380
So 380 - 100 = 280
Answer:
Around 5 means 3 to 7 intervals.
Step-by-step explanation:
When we estimate a 95% confidence interval from different samples, we expect 95% of the intervals to include the population mean.
So with 100 different researches, around 95% of 100 (=95) intervals will contain the population mean.
So around (100-95) = 5 intervals will not contain the population mean.
Around 5 means 3 to 7 intervals.
When we estimate a 95% confidence interval from different samples, we expect 95% of the intervals to include the population mean.
So with 100 different researches, around 95% of 100 (=95) intervals will contain the population mean.
So around (100-95) = 5 intervals will not contain the population mean.
Around 5 means 3 to 7 intervals.
Answer:
Step-by-step explanation:
An arithmetic sequence that is described by the explicit formula ...
can also be described by the recursive formula ...
Matching parts of the formulas, we see that a1 = 4, d = -7. Putting these values into the explicit formula gives ...
The question is incomplete, the complete question is;
A grocer has 18 kg of black tea worth $3.5 per kg. She wants to mix it with green tea worth $2.6 per kg to sell the mixture at $2.9 per kg. How much of green tea should she use?
Answer:
36
Step-by-step explanation:
Let the weight of the green tea used be x kg.
From the question:
We have:
18 kg of black tea at $ 3.5 per kg. Thus total cost of black tea is 18 x 3.5 = $ 63
Cost of green tea is $2.6 per kg. Total cost of green tea is 2.6 * x = $2.6x
Total weight of the mixture is 18 + x kg.
Total cost of the mixture is = $2.9 (18 + x)
Thus,
Total cost of black tea + total cost of green tea = Total cost of the mixture
$63 + $2.6 x = $2.9 (18 + x)
$63 + $2.6x = $52.2 + $2.9x
63 – 52.2 = 0.3 x
10.8 = 0.3 x
x = 10.8/0.3
x = 36
36 kg of green tea is needed
Answer:
5n
Step-by-step explanation:
cost of one helmet = $5
let 'n' be the number of person that is n=1,2,3,4........
note that the value of n is always a natural number
therefore the expression = 5n
where 5 is the cost one helmet
n is the number of persons