Find the sum of the first 4 terms of the series. 2-8+32-128+ a. –101 b. –103 c. –102 d. –104 select the best answer from the choices provided a) a b) b c) c d) d

Option c. (-102) is the sum of first four terms of the sequence.

Step-by-step explanation:

In the sequence 2-8+32-128..... we know number of terms n=4

First term A(1)=2

Ratio of the terms r = (-4)

And we have to calculate the sum of four terms

We know the formula for this question is

Sum of first 4 terms is (-102)

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step-by-step explanation:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116