Answer-
The rider’s displacement during this time is 17.01 m
Solution-
As we know,

Where s = displacement,
u= initial velocity = 0, as the rider starts from rest
a= acceleration = 0.5 m/s²
t= time taken = 8.4 s
Putting the values,

Given

How to factor
Solution
Step 1
Multiply the first and last costant

Step 2
Write out all the pair factors of -6x^2

Step 3
Check for the pair, such that when you add you will get -x

Step 4
Replace -x with -3x+2x in the equation

Step 5
Put them into brackets Since + is at the center no stress.

Step 6
Factor out what is common in the bracket

Step 7
What is in the bracket are the same, pick one

Answer:
9
Step-by-step explanation:
The length of the paper , x, can be obtained using Pythagoras :
Width = 12 ; length = 15
x² = 15² - 12²
x² = 225 - 144
x² = 81
x = sqrt(81)
x = 9
Hence, length of the paper = 9 inches