in this truss bridge,△ABC ~△XYZ.based on the given information,what is AB? A)7m , B)14m , C)21m , D)28m
2 answers:
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Answer:
C
Step-by-step explanation:
Given
+
← factor the denominator of first fraction
= +
Multiply the numerator/ denominator of second fraction by (x + 2)
= +
The denominators are now common, so add the numerators leaving the denominator, that is
=
= → with numerator 4x + 6 → C
Answer:
186
Step-by-step explanation:
The sample mean, x, is the central value in the confidence interval, that is, the average between the upper and lower bounds of the interval.
In this case, the Lower bound is 184.00 and the upper bound is 188.00. Therefore, the sample mean is given by:
The mean length, in seconds, of the sampled songs is 186.00.