Find the lateral surface area of the figure. Use 3.14 for pi.
S= 2pi rh
13 m
20 m

I haven't answered a question like this in a while but I'll just give it a shot:

I think it's 816.4

Step-by-step explanation:

h=13

20/2=10 so I believe that 10 would be the r (radius)

So then the equation could be:

S= 2(3.14)10×13

Multiply them all together and you get 816.4^^

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

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step-by-step explanation: