$63.90 (total)
$5.40 (cards)
$11.70/per (bags)
$63.90 - $5.40 = $58.50
$58.50 / $11.70 = 5
She invited 5 guests (b).
90 x 0.4 = 36
90 - 36 = 54
The sale price is $54
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
Learn more about function at:
#LearnwithBrainly
First arrange numbers
14,15,15,17,19,20,21,23,24
19 is median
15+15/2=15 is first quartile
Answer:
24sq.ft
Step-by-step explanation:
<h3>
Area of a parallelogram = Base*Height</h3>
Here,
→Base = 6ft, Height = 4ft
→ 6*4ft
→24sq.ft
<h3 /><h3>
While writing area of a figure, we have to express the area in sq which means square</h3>
<h2>
<em>ThankYou</em></h2>
<em>Please mark me as brainliest</em>