Answer:
number o students bought pennants = 18
number of student bought fancy ones=12
Step-by-step explanation:
Let x be the number o students bought pennants
and y be the number of student bought fancy ones
total 30 students


Plain pennants cost $4 each and fancy ones cost $8 each.

Substitute 30-x for y in second equation



Subtract 240 from both sides

divide both sides by -4
x=18


number o students bought pennants = 18
number of student bought fancy ones=12
A vertex can be the max or min. The vertex is the highest point or lowest point of a function.
Answer:
I think option B is correct
Answer:
Step-by-step explanation:
top left r= 0.9 ; top right r= 0.4
bottom left r=0; bottom right r= -0.4
if they are not around a line looking like r=0
if they resemble a line well is close to r=1
if line goes up from left to right is r positive
if line goes down from left to right is r negative