Answers

2016-06-19T14:11:25+08:00
I think it's:

if x=5, then

f(x) = 2(5) + 5
f(x) = 10 + 5
f(x) = 15

(Kill me if I'm wrong xD I forgot this)
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2016-06-19T14:13:21+08:00
Given:
f(x) = 2x + 5
x = 5

Solution:
f(x) = 2(5) + 5
f(x) = 10 + 5
f(x) = 15
0