Question

The table shows data gathered by an environmental agency about the decreasing depth of a lake during the first few months of a drought.


Time (weeks)

Lake Depth (feet)

0 346.0
2 344.8
5 343.0
7 341.8
10 340.0
12 338.8
The lake's depth after four weeks will be

Answer 1

You need to graph this

Answer 2

Okay, done it, here is the result: just entered it into: http://www.alcula.com/calculators/statistics/scatter-plot/

Answer 3

This shows that there is a linear correlation between each of the points

Answer 4

Now wait, I can get the answer

Answer 5

I already got it, but thank you

Answer 6

here is new plot with equation:

Answer 7

So our equation is y= 346 - 0.6x i.e depth = 346 -0.6 (time in weeks)
depth = 346 -0.6 (4 weeks) i.e. we lookin for depth after 4 weeks.
depth(y) = 346 - 0.6(4)
y= 346 - 2.40
346-2.40 = 343.6