3/10+(−7/20) enter your answer as a fraction, in simplified form i need quick

Identify the parent function that can be used to graph the function f(x)= (1/4x)^3

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible