Answer:
15. It is a function
16. It is a function
Mapping diagram is attached for reference.
Step-by-step explanation:
Mapping diagram is a set of two parallel columns.
The first column includes the 'domain'.
And the second column includes the 'range'.
A relation is a function,
if every domain (
) has only one range (
)
The given coordinates in the set form are in the form (
)
15. We observe that each '' is attached to only one ''
Therefore this relation is a function.
16. We observe that here also each '' is attached to only one ''
Therefore this relation is also a function.
1. A 2. A 3. A 4. A Kind of odd that they all turn out to A.
These are really easy and it’s worth the points
Solution:
Let x represent a number of calling minutes. According to the problem, we want:
now, putting the similar terms together, we obtain:
this is equivalent to:
now, solving for x, we get:
then, the correct answer for the first question is:
400 minutes is the number of minutes the two plans cost the same
now, for the second question, we can replace the above value (400 minutes) into the following equation:
so that, the correct answer for the second question is:
$55 is the cost when the two plans cost the same
Since all the merchandise is 1/4 off, all we need to do to figure out the original price is to multiply $25 by 4.
24×4=100
The original price of her merchandise would be $100.
