Start by calling the unknown amount 'x'. We can then set up a relationship to represent the question:

or

and then solve for x, by dividing both sides of our equation by 0.3


213 is 30% of 710
To check:
Answer:
D
Step-by-step explanation:
D. Sasha's method is exponential because it increases by a fixed factor, and Mona's method is linear because it increases by a fixed number.
Hope this helps!~