How to use the formula c=5/9(f-32) to find the temperature in degrees celsius if the temperature is 86 degrees fahrenheit. what is the temperature in degrees celsius

The second term of an arithmetic sequence is 30. the fifth term is 90.calculatei). the commor difference of the sequence ii). the first term of the sequence tje first, second and fifth terms of the arithmetic sequence are the first three terms of a geometric sequence calculate the seventh term of the geometric sequence