A) We know that

where d

= distance,
v = velocity,
t = time
In this case, d = 2 mi., t = 30 min. So we get

Dividing both sides by 30, we get

Thus a function for his walk would be

where y = distance and x = number of minutes he walks.
b) Domain of a function is a set of x-values on which the function defined. In this case, the number of minutes is 30 at maximum. So the domain of the function is [0, 30].
The answer to this problem is 2 liters.
Answer:
X=-1, y=-1
Step-by-step explanation:
-3x+8y=-5
6x+2y=-8
-6x+16y=-10
18y=-18
Y=-1
X=-1
Answer:
f(3) = 30
Step-by-step explanation:
f(3) = 2(3)^2 + 12 = 30