Need help ASAP I’m not sure what to do

21

Step-by-step explanation:

24

Step-by-step explanation:

So, f(x) x^2 + 5x = x(x+5)

f(3) means that you simply replace x = 3; meaning that f(3) = 3 x (3+5) = 3 x 8 = 24

it costs $20 to interview each person for a survey. find the cost to obtain a +- 3% margin of error.

step-by-step explanation:

copy and paste, put it in google

answer;

the correct answer

just use google you beautiful person.

have a nice day < 3