Answer:
19404
Step-by-step explanation:
sum of arithmetic series is
Sn = n/2 (2a + (n-1)d)
or
Sn = n/2 (a + an)
a = 1st unit
an = last unit
d = difference
8-3 or 13-8 so d = 5
then first step is to find the value of n
an = a + (n-1)d
438 = 3 + (n-1)5
438 - 3 = 5n - 5
435 = 5n - 5
435 + 5 = 5n
440 = 5n
n = 440/5
n = 88
then we can find the sum
Sn = 88/2 (3 + 438)
S88 = 19404
Answer:
I did the solution of this question.
Step-by-step explanation:
Hope this helps uh.
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Answer:
138picm2
Step-by-step explanation:
An hemisphere is half of a sphere. This means a sphere is twice an hemisphere .
Surface area of sphere of same radius = twice surface area of hemisphere
Therefore
Surface area of sphere = 2 * 69
= 138 pi cm2
I hope this was helpful, Please mark as brainliest
The cistern is losing approximately 3.963 gallons of water per hour.
<u><em>Explanation</em></u>
A cistern is leaking 0.25 liters of water per minute.
<u>We know, 1 gallon = 3.785 liters</u>
So, 0.25 liters = gallons
That means, the cistern is losing 0.06605....gallons of water per minute.
So, the amount of water losing in 1 hour or 60 minutes <em>(Approximately)</em>
-4 is the negative and 3 is the positive if I see correctly.