Please answer this ASAP

Here's the solution ~

The first term (a) of the sequence is 1

common difference (d) = -2 - (1) = -3

last term (l) is -236, so let's find the number of terms in the given progression ~

So, there are total of 80 terms in the sequence.

now, as we know ! in a Arithmetic progression the sum of all the terms is :

Now, let's use this formula ~

or we can use method ll where, the first and last terms are given ~

let's use similar procedure :

Now, let's find the sum ~

[ I'm taking first term as a1 ]

Let's use the formula ~

2 & 7

step-by-step explanation:

he climbs 300 ft/hr at a constant rate. the peak is at 1,500 ft.

when going up, he reaches 600 ft in 2 hours. remember, that he is going in a constant rate. divide 600 with 300:

600/300 = 2

assuming that he takes the same route back (meaning that it's a 1500 ft route back, you can solve.

note also that you are solving when he gets back to 600 ft after he reaches the peak.

first, find the amount of hours it takes to get up the peak. divide the total amount (1500), with the ft/her (300) to get the amount of hours (x):

1500/300 = x

x = 5

it takes jamie 5 hours to get up. now, he is returning down, and reaches 600 (his current destination). remember that he climbs at a constant 300 ft/hr. divide 600 with 300:

600/300 = x

x = 2

now add the two numbers together.

x = 5 + 2 = 7

jamie takes 7 hours to go up the mountain and reach his current position when descending.

(total amount/constant rate) = (time).

remember that it is a constant rate, so in total, when he gets back down the mountain, it will take the same amount of time as when he goes up. the total amount for the round trip is: 5 + 5 = 10.

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