It’s -5^10 because, since the exponent is an even number, the number has to come out positive no matter the positive or negative value of its base. (This would change if the exponent was an odd number) And since 5^10 is of a greater value than 5^9, -5^10 is the correct answer.
I’m positive it’s x=18 because add 6 to both sides, and add 6 plus 12.
2x + 3y = -21
2x = -21 - 3y
x = -10.5 - 3/2y
-10x + 2y = 20
-10(-10.5 - 3/2y) + 2y = 20
105 + 15y + 2y = 20
105 + 17y = 20
17y = -85
y = -5
2x + 3y = -21
2x + 3(-5) = -21
2x - 15 = -21
2x = -6
x = -3
Therefore, the coordinates are (-3, -5).
The margin of error is dependent only on the sample size assuming that the samples are completely random. In order for the margin of error to be reduced, the sample size must be greater than the population size. Therefore, the answer is
<span>B. Using a sample of 100
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