Convert Celsius to Fahrenheit Whats next?

Tell us what’s happening:

Your code so far

function convertToF(celsius) {
  var fahrenheit;
  // Only change code below this line
  var celsius = (celsius/1.8)+ 32;
  
   return celsius;
  // Only change code above this line
  return fahrenheit;
}

// Change the inputs below to test your code

convertToF(30);

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36.

Link to the challenge:
https://www.freecodecamp.org/challenges/convert-celsius-to-fahrenheit

var fahrenheit = (celsius * 9/5) + 32;
this is it

how to fix these tasks
convertToF(0) should return a number
convertToF(-30) should return a value of -22
convertToF(-10) should return a value of 14
convertToF(0) should return a value of 32
convertToF(20) should return a value of 68
convertToF(30) should return a value of 86
???

I have no idea, how to fix this!

Sorry, I didn’t understand.