It's the third choice because a biconditional statement is an "if and only if " statement, using all the same words in the original statement.
Given that 5 pounds of rice at a store cost $6.50.
Then 1 pounds of rice at a store cost = $6.50/5= $1.3
So the equation for the cost can be written as:
C=1.3P just like we write equation y=mx
Now we have to graph the cost C, vs pounds of rice.
Variable for Pounds of rice is not given so let it be "P"
So let's make a table for number of pounds (P) and cost (C) the we can graph the points from that table to get the final graph.
Attached graph is the final graph.
C is what I think/Know for sure
Both triangles that are given (with right angles) lie in plane m, proving that AC is perpendicular to plane m. As angle acd is from a triangle that shares the common perpendicular, it too is a right angle