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A truck starts from rest and covers 400m distance in 12 seconds. Calculate final velocity and acceleration of the truck.
Answer:

Step-by-step explanation:
The equation of a line is usually written in the form of y=mx+c, where m is the gradient and c is the y-intercept.
The product of the gradients of perpendicular lines is -1.
Gradient of given line= 3.
(Gradient of line)(3)= -1
3m= -1
m= 
subst. m=
into the equation:

To find the value of c, substitute a coordinate.
When x=0, y=4,

Thus the equation of the line is
.
C is on the line and D is not on the line.
-1/2(-40)+1=21
-1/2(20)+1≠-11
ANSWER= 30 rides
STEP-BY-STEP EXPLANATION
y=mx+b
m= $0.5 (per ride)
b= $5 (the cost)
x(rides) and y(parents money)
y= 0.5 x + 5
20= 0.5 x +5
20 - 5 = 0.5 x
15=0.5x
x=
x=30 rides
48 ounces = 3 pounds
1 ounce = 0.0625
0.0625 (ounces) × 48 = 3 pounds