Answer:

Step-by-step explanation:
In order to evaluate a function at a given x-value, plug in that value into the actual function

Answer:
The arc length of the semicircle is half the circumference of the full circle
Answer:
She earns $8.00 more on Sunday
Step-by-step explanation:
Saturday 12.50x4=50.00
Sunday 14.50x4=58.00
add 4 each time
the nth term is a_n or f(n)
the next term after that is a_{n+1} or f(n+1)
so each term is 4 more than previous
basically
a_{n+1}=4+a_n or
f(n+1)=4+f(n)
same thing