Answer:
21mm
Step-by-step explanation:
The formula for solving the area of a rhombus is :
, where x and y are two intersecting diagonals.
In this case, we are given both values, thankfully. 6 and 7 are to be replaced with x & y. Now, the rest you have to do is simple math.

The area of the rhombus is 21mm.
Answer:
NOT! (10, 1)
Step-by-step explanation:
Answer:
k = 12
Step-by-step explanation:
Given in the question,
Cost of the the movie tickets is proportional to the number of tickets sold.
Cost of movie tickets (C) ∝ number of tickets sold (T)
C ∝ T
C = kT
Here 'k' is a proportionality constant.
Since, line given in the graph passes through a point (5, 60)
60 = k(5)
k = 
k = 12
Therefore, value of proportionality constant is 12.