I need help please.

Question

A scuba diver recorded the following data. Answer the following questions. Depth(m) 5 10 15 20 25 30 Pressure(kPa) 140 220 260 280 330 400

A. Plot the points and draw a line of best fit (You can use Excel).

B. Determine an equation for your line of best fit. Identify your variables.

C. According to your graph/equation, determine standard air pressure (Air pressure when you are at the surface, 0 m deep).

D. A submarine will crush when the pressure reaches 3500 kPa. Determine how deep the submarine can go

Answer 1

Hi Hadi!

I'd be happy to help. A virtual lesson would be necessary to explain all of this, but I'll help by giving a general outline:

A. The points are (5, 140), (10, 220), and so on. To create the graph, you'll put the Depth on horizontal x-axis (at the bottom) and you'll put the Pressure (kPa) on the vertical y-axis (on the left). On the bottom, you'll label the line from 0 to 30. On the left, you'll label up from 0 to 400. To plot each point––for example, the (5, 140)––you'll move along the bottom until you hit the 5 mark, and then you'll climb up the chart until you arrive at 140. That is where your (5,140) point will be. To draw a line of best fit, just draw a line in that seems to agree with most of the points!

B. An equation of a line is y = mx + b. The m stands for slope or steepness of the line. You need to know two points on the line to calculate this. The b is the y-intercept, or the height on the vertical y-axis where the line that you drew intersects with the y-axis.

C. To answer this, you'll go to the spot on the graph where your line intersects with the vertical y-axis. The height on the y-axis at this intersection is your answer!

D. I'd need to explain this with a drawing, so be sure to reach out if you'd like to meet for a tutoring session.

Thanks, and best of luck! You can do this!!