Answer:
3.14
Step-by-step explanation:
Area of a corcle is sexpressed as';
A = πr²
π = A/r²
π = 78.54/5²
π = 78.54/25
π = 3.1416
When the area is divided by radius the required constant is 3.14
It will take approx.65 of caffeine remaining after 6 hours
In -2x

, the exponent will be dealt with first. With (-2x)

, the multiplication is going to be done first. This is determined because of Order of operations.