Answer:
x = -20
Step-by-step explanation:
First we can rearrange the equation:
-18 = -28
2 * - 18 = -28 * 2
The 2s canel out
x - 36 = - 56
x = -20
What is the sum of the geometric sequence 1,3,9... if there were 11 terms?
1 answer:
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