The height of this iron rod is estimated to be 100 centimeters. what is the possible error of measurement?
a. 10 cm
b. 5 cm
c. 2.5 cm
d. 1 cm

Hey!

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Explanation:

On the centimeter it's measures in increments of 5. The iron passes the 95 mark, so we can automatically take out option A and B. The iron rod looks like its half way between the 100 and 95 mark. So we can say that the possible error of measurement is 2.5cm. 1cm. seems to small.

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Step-by-step explanation:

It is impossible to calculate half-measurements in his case, so we can say so about this measurement.

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answer: it's d

step-by-step explanation:

x² + 11x + 18 < 0  

[-11 ± sqrt(121 - 72)]/2 = (-11 ± 7)/2  

solution: (-9, -2)

step-by-step explanation: