Yes... You have $10 your brother is supposed to give you $10 he gives you the money the friend told him to and you would have $20 PLUS the ten that he owes you. That would make you have $30. He took youre ten and gave you 20 but you were supposed to have 20 in the first place. He needs to give you the ten back he owes you.
Converting Celsius to Fahrenheit is really multiplying c by 1.8 and then adding 32. so, 40•1.8= 72, 72+32= 104!!!! but it's asking how many degrees in Celsius is it below 40°. using the given formula, C= 35