Answer:

Step-by-step explanation:
You would substitute "2x" for every "x" in the function in the same way you would substitute any other number.
So if f(x)=Sqrt[7x²-3x], then: f(2x)=Sqrt[7(2x)²-3(2x)]
=Sqrt[7(4x²)-3(2x)]
=Sqrt[28x²-6x]
Your answer would be 4000000000 your welcome :D
I think.....
A) 45 mins
each big square represents 15 mins
b) 100km/h
speed= distance/time so it would be 50km/0.5h= 100km/h
Hope this helps! :)
Answer:

Step-by-step explanation:
Given:
Fixed salary earned by Jeanette per week = 
Additional amount earned by her for each sign she sells = 
To find: linear equation which represents her weekly pay based on the number of signs she sells.
Solution:
Let number of signs sold by Jeanette be x
So, her weekly pay = fixed pay + Additional amount earned by her for each sign she sells

Answer:
y=4x+c
23=4(5) +c
23=20+c
23-20=c
3=c
y=4x+3
Step-by-step explanation: