Answer:
= 96
Step-by-step explanation:
The n th term of a geometric sequence is
= a
where a is the first term and r the common ratio.
Both values have to be found.
Using
a₂ = - 144, then
ar = - 144 → (1)
a₅ = 486, then
a
= 486 → (2)
Divide (2) by (1)
= 
r³ = - 3.375 ( take the cube root of both sides )
r = - 1.5
Substitute r = - 1.5 into (1)
- 1.5a = - 144 ( divide both sides by - 1.5 )
a = 96
Hence explicit formula is
= 96
The cost of the gasoline in US dollars is $53.24.
<h3 /><h3>Definition of exchange rate</h3>
Exchange rate is the rate at which one currency is exchanged for another currency. In this question, $1 would be exchanged for 1.26 Canadian dollars.
<h3>Conversion of 15 gallons to liters</h3>
In order to convert 15 gallons to liters, multiply 15 by 3.79
15 x 3.79 = 56.85 liters
<h3>Total cost of of 56.85 liters in Canadian dollars </h3>
56.85 liters x C$1.18 = C$67.083
<h3>Total cost in US dollars</h3>
C$67.083 / 1.26 = $53.24
To learn more about exchange rate, please check: brainly.com/question/25780725
Answer:
B. $2,565
Step-by-step explanation:
The correct answer is CI = (71.415%, 78.915%)
The correct option is (A)
<h3 /><h3>What is Confidence level?</h3>
A confidence interval is the mean of your estimate plus and minus the variation in that estimate.
Given:
x = 376
Sample = 500 students
CI= [(376/500-1.96 √((376/500)*(124/500)/500) , (376/500-1.96
√((376/500)*(124/500)/500)]
CI = (71.415%, 78.915%)
Hence, CI = (71.415%, 78.915%)
Learn more about CI here:
brainly.com/question/26772699
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