Ihave twice as many nickels as quarters. if the coins are worth $4.90, how many quarters and nickels do i have?

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

You got a job selling magazines door-to-door. you are paid $100 per day plus $1.50 for each magazine you sell. which recursive formula models this situation?