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Ket [755]
3 years ago
14

Help anyone please i need it

Mathematics
1 answer:
zheka24 [161]3 years ago
4 0

Answer:

The sum is equal to -905,200

Step-by-step explanation:

we know that

The formula to calculate the sum is equal to

Sn=n\frac{(a1+an)}{2}

In this problem

n=775 -----> number of terms

a1 is the first term

a1=(-3(1)-4)=-7

an is the last term

an=(-3(775)-4)=-2,329

substitute

Sn=775\frac{(-7-2,329)}{2}=-905,200

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Step-by-step explanation:

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Have a nice day!

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