Find S12 for geometric series: (-7.5) + 15 + (-30) + ...

S12 for geometric series: (-7.5) + 15 + (-30) + ... would be: 10237.5

Step-by-step explanation:

Given the sequence to find the sum up-to 12 terms

As we know that

A geometric sequence has a constant ratio 'r' and is defined by

           ∵  

Thus, S12 for geometric series: (-7.5) + 15 + (-30) + ... would be: 10237.5        

3. (5x + 1) - (-10x + 6)

simplify the answer choice. combine like terms. remember to distribute the negative to the terms inside the second parenthesis. also remember that two negatives = one positive, and one of each sign = negative.

- (-10x + 6) = + 10x - 6

simplify. combine like terms:

5x + 1 + 10x - 6

5x + 10x + 1 - 6

15x - 5

∴ it is your answer

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step-by-step explanation: