Make a proportion
6/18 = 10/z
Cross multiply
180 = 6z
180/6 = z
Z = 30
The formula to find the area of a circle is pi x radius^2.
pi = 3.14 (in this case)
radius = 6
6^2 (6 x 6) = 36
36 x 3.14 (radius^2 x pi) = 113.04
So, the area of a circle with radius 6 cm is 113.04 cm.
The answer I'm pretty sure is B but I can't really explain it, sorry
We first need to find the gradient of the line

From the graph, we see the graph intercepts y-axis at -1
Hence, the equation of the line is