If submarine is at the surface (the initial position) and then dives 375 ft, the coordinate of submarine becomes -375 ft <span>relatively to the initial position. When the submarine dives another 175 ft down, the coordinate of submarine becomes -375-175=-550 ft relatively to the initial position.
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Answer: Correct choice is A.
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For this case we have that by definition, the equation of a line of the point-slope form is given by:

Where:
m: It's the slope
It is a point through which the line passes
To find the slope, we need two points through which the line passes, observing the image we have:

Thus, the equation is of the form:

We choose a point:

Finally, the equation is:

Answer:

Multiply 800 to 4/5 to see how much they make per day.
800 * 4/5 = 640
So, they make 640 fishing reels per day.
Multiply this to 30:
640 * 30 = 19,200
So they will make 19,200 fishing reels in 30 days.
This is not enough for the order.