The function is all of the ordered pairs (dots/points) on the graph. The definition of a function is that all inputs (x values) have exactly one output (y value). Therefore, this is a function, and the x and y values have been plotted on this graph to more easily visualize the function for you.
Answer:
idk mabey half of 25%
Step-by-step explanation:
It equals 2.25 because you multiple 2 and 9 and then divide the answer by 2.
Let the average speed at day time be x miles per hour
Therefore at night the average speed = (x + 10) miles per hour
Time = Distance / speed
Time at day - Time at night = 36 minutes.
36 minutes = 36/60 hour = 6/10 hour
Time at day = Distance / speed at day = 120 / x
Time at night = Distance / speed at night = 120 / (x + 10)
120/x - 120/(x + 10) = 6/10
1/x - 1/(x + 10) = 6/10* 1/120
1/x - 1/(x + 10) = 1/200
((x + 10) - x) / ((x)(x+10)) = 1/200
(x + 10 - x) / ((x)*(x+10)) = 1/200
10 / ((x)*(x + 10)) = 1/200
1 / ((x)*(x + 10)) = 1/2000
Therefore x (x + 10) = 2000
x and x +10 are 40 and 50. Because 40*50 = 2000
x = 40
Average speed in the day time = 40 miles per hour
Y = 18 - x
3x - 18 + x = -12
4x = 30
X = 30/4
= 7 1/2
