Answer:
9 ft.
Step-by-step explanation:
Your work for #8 and #9 is fantastic. What neat, clear writing!
The table in #10 shows three points on a line, (0, 3), (10, 5), and (15, 6).
Get an equation for the line using any two of the points.
Let's use (0, 3) and (10, 5).
Slope [tex]m=\frac{5-3}{10-0}=\frac{1}{5}[/tex]
An equation for the line is
[tex]y-3=\frac{1}{5}(x-0)\\y=\frac{1}{5}x+3[/tex]
Remember, x represents time in minutes, and y represents depth of oil in the tank in feet.
When the time is 1/2 hour (that's 30 minutes!),
x =30 and
[tex]y=\frac{1}{5}(30)+3=6+3=9 \text{ ft}[/tex]
