How can parentheses be added to the following equation to make it true?

5× 1/2 = ? a) more than 5 because you are multiplying by a whole number b) 5/10 because you multiply the numerator and denominator by 5 c) less than 5 because you are multiplying by a number that is more than 1 d) less than 5 because you are multiplying by a number that is less than 1

Write two subtraction equations that are equivalent to 5 + 12 = 17.

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')