What is the value of f (-2) when f (x)=-2 (3 +x)?

The sum of two numbers is 86, and their difference is 20. find the two numbers

Samantha is growing a garden in her back yard. she spend $90 setting up the garden bed and buying the proper garden supplies. in addition, each seed she plants cost $0.25. a. write the function f(x) that represents samantha's total cost on her garden. b. explain what x represents. c. explain what f(x) represents. d. if samantha plants 55 seeds, how much did she spend in total?

Is the power produced directly proportional to the wind speed, give reasons for your answer?