Answer:
d=9
Step-by-step explanation:
The gradient of straight line is given by

Plug in our knows

The constant term in the equation is -20 because you will always be subtracting 20 no matter how big x is
Answer:

Step-by-step explanation:
We have the function 
In this case we want to find the value of f0)
To find f(0) you must replace the x in the function with the number 0 and solve as shown below



Therefore

Answer: There are 12 bills for $20, 13 bills for $10 and 14 bills for $5.
Step-by-step explanation:
Let the number of twenties be x
Let the number of tens be x+1
Let the number of fives be x+2
Amount from twenties will be given as

Amount from tens will be given as

Amount from fives will be given as

According to question,

So, there are 12 bills for $20, 13 bills for $10 and 14 bills for $5.