If f(x1)+f(x2)=f(x1+x2) for all real numbers x1 and x2, which of the following could define f?
a) f(x)=x+1
b)f(x)=2x
c)f(x)=1/x
d)f(x)=e^x
e)f(x)=x^2

i have no idea how to go about this, if someone can explain it to me.

What is 20+(5 x 2/5 )+ 3 show your work

You spin the spinner shown below once. each sector shown has an equal area. what is p(beaver ) p(beaver)? if necessary, round your answer to 2 2 decimal places.

Amajor grocery store chain is trying to cut down on waste. currently, they get peaches from two different distributors, whole fruits and green grocer. out of a two large shipments, the manager randomly selects items from both suppliers and counts the number of items that are not sell-able due to bruising, disease or other problems. she then makes a confidence interval. is there a significant difference in the quality of the peaches between the two distributors? 95% ci for pw-pg: (0.064, 0.156)