Value of f(4) is 
given 
Step-by-step explanation:
We are given and we need to find value of f(4)
Solving:
We will put x=4 and solve the given equation:
We know (4)^2=16
So, Value of f(4) is given
Keywords: Solving Equations
Learn more about Solving Equations at:
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This question would be C. Hope this helps
Answer:
Step-by-step explanation:
Let's put in some numbers to make this easier to understand.
Let's say she has to travel 20 km.
On Monday, she travels at 4 kph. This takes 5 hours.
On Tuesday she travels 25% faster, at 5 kph. This takes 4 hours.
To figure percent reduction we take
100 % * (old - new) / old
100 % * (5 hr - 4 hr ) / 5 hr
100 % * 1 hr / 5 hr
100 % * 0.20
20% reduction.
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