The times taken by 18 people to complete a puzzle are shown. Time, t minutes Frequency
8-1
0 5
7
10 < t < 20
5
20 < t < 30
7
30 < t < 40
1
Frequency
Draw a frequency polygon
for the data.
2
1
0
0
40
10 20 30
Time, t (minutes)

the domain of a function is the set of input values, x , for which a function is defined. the domain is shown in the left oval in the picture below. the function provides an output value, f(x) , for each member of the domain.

5 + 8 +7 + 4 + 0 +1 = 25

step-by-step explanation:

it's undefined because anything multiplied by 0 is 0. that said, 7 days is 168 hours

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x