If lines ab and cd are parallel, which of the following statements are true?
check all that apply.
a. ab and co are coplanar
b. ab || cd
c. ab and cd are perpendicular
d. abico
e. ab and cd intersect at a single point
f. ab and cd are skew lines
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What value of x will make the triangles similar by the sss similarity theorem?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.