Math7 Adding and Subtracting Inequalities

John has a debt of $4 and finds $x in his pocket. If he needs at least $3 more to pay off his debt, what is the least amount John could have found?

A tree is currently 7 feet tall and needs to grow more than 10 feet to provide adequate shade. How many more feet, x, does the tree need to grow at least to provide the shade?

John has $8 and wants to buy a gift that costs no more than $15. How much more money can John spend?

Mike has $4 and wants to buy a game that costs no more than $8. How much more money can Mike spend?