The <em><u>correct answer</u></em> is:
If a graph of two variables is not a linear function, then the two variables are not directly proportional.
Explanation:
A contrapositive is formed by negating both the hypothesis and conclusion of a conditional statement and switching them.
We can calculate a side of a triangle if the side's opposite angle, another side and its opposite angle are known using the Sine rule:
a/sin(A) = b/sin(B) = c/sin(C)
Answer: If four numbers are proportional, a : b = c : d, then the product of the extremes is equal to the product of the means. ad = bc
Answer:
Amount of money paid by each student is equal to 
Step-by-step explanation:
Given: A group of children bought 
presents that cost 
each and a card that cost 
.
To find: amount of money each student paid in terms of 
Solution:
Cost of each present 
Cost of presents 
Cost of a card 
Therefore,
Amount of money paid by each student in terms of = Cost of presents + Cost of a card
