A quadrilateral does have 4 side
Part A :
D = (1/4) * C D = 1/4 * 24 D = 24/4 = 6 ft above sea level
Part B :
Your answer is positive because D is still above sea level...if it would have been below sea level, then it would have been negative
Answer:

Step-by-step explanation:
Given

Required
Express in terms of
and 

Express 21 as 7 * 3

Apply law of logarithm

. So, we have:

Rewrite:

Answer:
C. △ABC ~ △DEF
Step-by-step explanation:
There are two geometry symbols among the choices.
~ is used for indicating similarity.
≅ is used for congruency.
Statement △ABC ~ △DEF means that triangle ABC is similar to triangle DEF. There is no triangle symbol in front of DEF in the picture, but I am assuming this was a typo.