A function has the property that each element of the domain maps to only one element. For example, if there's ever the case where a relation includes point (1,2) and (1,3) then that relation is not a function. So for each case write down all the points as described. If one point in the domain ever maps to two different points, then it's not a function
Solving for a variable means to rewrite the equation so that the desired variable is alone on one side. So, we have to "move" all the other variables/constants in order to make this happen. We are allowed to add/subtract the same quantity from both sides, or to multiply/divide both sides by any non-zero number.
Let's start with the first example: we are given
11. 
the variable 
is not alone on the right hand side because it is multiplied by 
. We can reverse this by dividing both sides by : the equation becomes
So, we have written the equation as 
, which means that now sits alone on one side of the equation, and thus we have solved the equation for !
Similarly, we do all the others:
12. 
Subtract 
from both sides to get
13. 
Subtract 
from both sides to get
Now divide both sides by 
to get
14. 
Multiply both sides by 2:
Divide both sides by 
:
Answer:
π units^2.
Step-by-step explanation:
The area = π r^2 where r = the radius and the radius = 1/2 * the diameter.
So the radius of this circle = 1/2 * 2 = 1.
The required area = π * 1^2
= π units^2.
Answer: -7
Step-by-step explanation:
Answer:
Step-by-step explanation:
1. •6.25 × 7.5 = "the answer"
2. •20 - "the answer"
