Step-by-step explanation:

Hence, coordinates A(2, 1), B(7, 1), C(2, 4) form a triangle.
Answer:
a. x+8=21
b. x = 13
Step-by-step explanation:
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Answer:
9sqrt3
Step-by-step explanation:
This is an order of operations question.
First, simply the exponent, which gives you 3^2*sqrt3
Next, 3^2=9, giving the final answer of 9sqrt3.
The answer to this question is 40 miles per hour.
:)