From 72 to 90 it is a 25% change
Part A:
Expression

The constants are 15 and 100
The variables are

and

Part B:
Expression

has two terms;

and

. We know this because both have different variables attached to them
Part C:
The term

is the expression for the total earned from her allowance
Answer:
C.
Step-by-step explanation:
It does not have to be April if there are 30 days. If its not April, it can still have 30 days. April does have 30 days.
Answer:
686.94
Step-by-step explanation:
first year, 42 interest
second year, 44.94 interest
Total=686.94
<span>Tractable refers to that how hard is problem
Tractable are those that can be solved in a polynomial time
where as the intractable are those which can be solved by using large time
whereas unsolvable are those which cannot be solved and requires infinite amount of time
hope it helps</span>