21 A drone's descent from high above the school was recorded by students in the robotics class. The graph shows
the height of the drone after x seconds of descent.
y Drone Flight
60
55
50
45
40
Height of Drone (feet)
35
30
25
20
I
15
10
5
0
6 12 18 24 30 36 42 48
Time (sec)
A
B
What is the range of the function for this situation?
All real number less than or equal to 39.
All real numbers less than or equal to 55.
All real numbers greater than or equal to 0 and less than or equal to 39.
All real numbers greater than or equal to 0 and less than or equal to 55.
С
D
M

Lian is deciding which of two gyms to join. each gym charges a monthly rate plus a one-time membership fee. lian correctly wrote and solved a system of linear equations by substitution to compare the costs of the memberships. in her work, she substituted an expression for one variable and solved for the other. this resulted in the equation 75 = 75. what can lian conclude? one gym charges $75 per month. each gym charges $75 per month both gyms charge the same monthly rate and the same membership fee. both gyms charge the same monthly rate, but not the same membership fee.