calculus
posted by kasey .
I am having a problem with solving this Given the function f described by f(x)=x+3, find each of the following:
f(0)
f(13)
f(12)
f(1)
f(4+8)
can you help me please?

first one f(0) = 0+3 = 3
last one f(4+8) = f(12) = 12+3 = 15
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