Answer:
4(2a)+7(-4b)+(3•c•5)
8a -28b +(15*c)
Step-by-step explanation:
Formula to find the length of two endpoints: 
Now, solve with the given endpoints.

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Now, simplify using what we know about radicals.
Solution in picture.
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The length between the endpoints is 2√34 (Option B)
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Best Regards,
Wolfyy :)
Answer: B.54 Square inches
Step-by-step explanation: Surface Area
= 2(lb + bh + lh)
= 2(6 x 3 + 3 x 1 + 6 x 1)
= 2(18 + 3 + 6)
= 2(27)
= 54 square inches
Answer: x= -8
Step-by-step explanation:
slope formula: y2-y1/x2-x1