Name the following property: 12 + (7+4) = (12+7) + 4

Pls an ice cream shop sells 5 times as many cake cones as waffle cones use variable x to represent the number of waffle the ice cream shop sells and use this variable to write an expression for the number of cake cones the ice cream shop sells. enter the expression for the number of cake cones the ice cream shop sells

I’m still confused on how to work the percentages

Do xuan nam isgoing to invest $1000 at a simple interest rate of 4% how long will it take for the investment to be worth $1040?