What is the common ratio for the geometric sequence?

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

If mary had 320 toy cars and she gave her friend 50 cars and then she gave her brother 72 more cars how much toy cars would mary have left ● explain with proper details