Given mapping is a function.
Domain: 
Range: 
Step-by-step explanation:
By observing Marco's mapping diagram we can see that every value in time is mapped to only one value in the cost. This means that there will be no repetition or same output to two different outputs so given mapping is a function.
<u>Domain:</u>
Domain is the set of all inputs of a function. Here time is input so domain of function is:

<u>Range:</u>
Range is the set of all outputs of the function on domain so the range of the given function is:

Hence,
Given mapping is a function.
Domain: 
Range: 
Keywords: Domain, range, function
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kids surf the internet for 35-60 minutes per day, the average is 52
Answer:
60%
Step-by-step explanation:
It’s simple
He needs to do 60, he has done 36
Percentage = (36/60) * 100
= 60%
Step-by-step explanation:
According to picture 1, it is <u>A. </u><u>corresponding.</u>
Also according to picture 2, it is <u>E.</u><u> </u><u>same </u><u>side</u><u> </u><u>interior.</u>
And according to picture 3, it is <u>D.</u><u> </u><u>vertical</u>
a) ∠PQR=65° (alternate interior angles theorem)
∠PRQ = 60° (linear pair)
x = 55° (angles in a triangle add to 180°)
b) ∠APQ and ∠PQR are congruent alternate interior angles.