The given formula is:F=32+1.8c To use the formula correctly , we need to follow the rules of bidmas ( brackets,indices division or multiplication) let’s apply the formula to each of the given recipes step :Recipe 1: the temperature is 200 C . Substituting the value of C into the formula:F=32+1.8*200 first ,we multiply:F=32+333 then we add:F=365 so, recipe 2 requires a temperature of 365•F . Recipe 3:the temperature starts at 220•C for 1hour then reduces . For the first part using 220•C,we substitute the value of C into the formula:F=32+1.8*220 firs we multiply:F=32+396 then we add :F=428 for the second part using 180•C we substitute the value of C into the formula: F=32+1.8*180 first we multiply:F=32+324then we add:F=356 so recipe 3 require temperature of 428•F for the first hour and then reduces to 356•F for the final 20minutes . In summary: recipe1 requires 392•F. Recipe 2 requires 365•F. Recipe 3 requires 428•F for the first hour and then reduces to 356•F for the first hour and then reduces to 365•F for the final 20 minutes.