Asaleswoman earns 30% commission on all the merchandise she sells. last month she sold $900 worth of merchandise. how much commission (in dollars) did she earn last month?

Ten times the square of a non-zero number is eqaul to ninety times the number

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax

Prove that 16^4-2^13-4^5 is divisible by 11.