Answer:
The correct answer would be D
Step-by-step explanation:
Answer: D
Step-by-step explanation: :)
121 gallons of gas
25 gallons of gas
115 gallons of gas
Answer:
Step-by-step explanation:
To calculate how many gallons the van needs to travel 550 miles you should multiply the number of miles by the relationship between the number of gallons of gas it needs to travel 220 miles, (it is important to put the quantity in miles on the denominator) as follows:
Therefore the van needs 25 gallons of gas to travel 550 miles
difference.
If the sum of the first 10 terms of an arithmetic sequence is 235 and the sum of the second 10 terms is 735. The first term of the arithmetic sequence is -21.5 and the common difference is 10.
Let's a represent the first term of the arithmetic sequence and the common difference as d
Formula for the sum of the first n terms of an arithmetic sequence is given by:
S_n = (n/2) * [2a + (n - 1)d]
So,
Sum of the first 10 terms: S₁₀ = 235
Sum of the second 10 terms: S₂₀ = 735
First 10 terms:
S₁₀ = (10/2) * [2a + (10 - 1)d]
235 = 5 * [2a + 9d]
47 = 2a + 9d
Second 10 terms:
S₂₀ = (10/2) * [2a + (20 - 1)d]
735 = 5 * [2a + 19d]
147 = 2a + 19d
Now we have a system of equations:
2a + 9d = 47
2a + 19d = 147
(2a + 19d) - (2a + 9d) = 147 - 47
10d = 100
d = 10
Substitute it into the first equation to solve for "a":
2a + 9(10) = 47
2a + 90 = 47
2a = -43
a = -21.5
Therefore the first term of the arithmetic sequence is -21.5 and the common difference is 10.
Learn more about arithmetic sequence here:brainly.com/question/6561461
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Answer:
Step-by-step explanation:
The sum of the first 10 terms of an arithmetic sequence is:
the sum of the second 10 terms is: a₁₁ + a₁₂+...+ a₂₀
And the sum of the first 20 terms of an arithmetic sequence is:
so the sum of the second 10 terms is:
Therefore we have:
and:
Answer:
Fisherman traveled 14.4 miles.
Step-by-step explanation:
A fisherman's downstream speed = 6 mph
and upstream speed = 4 mph
Let the fisherman traveled x miles he travels upstream.
Time spent in travelling x miles = hours [Since time = ]
Similarly when fisherman covers x miles down stream
Time spent in x miles = hours
Now total time in going upstream and downstream is 3 hours then
x
5x = 12×3
5x = 36
x = miles.
Since fisherman has traveled 2x distance so the answer will be 14.4 miles
Therefore, fisherman traveled 14.4 miles.
Answer:
6x² + 72x - 170 = -2
<=> 6x² + 72x - 168 = 0
<=> x² + 12x - 28 = 0
<=> x² + 12x + 36 = 64
<=> (x+6)² = 64
Step-by-step explanation: