Charlie's economics professor includes an extra credit question for every exam, which
adds 0.15 points to the student's cumulative grade at the end of the term. The equation
below is used to calculate Charlie's overall grade, C, including the n number of
questions Charlie answers correctly. What does the 79 mean in this equation?
C = 0.15n +79

the correct answer is x/3+10≥32

hope this !

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

$54.99

step-by-step explanation:

$54.99 includes 500 min. if she does not exceed 500 min then her bill is $54.99