If you are a teenager, then you are younger than 20. If both the conditional and its converse are true, write a biconditional.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Use the elimination method to solve the systems of equations. choose the correct ordered pair. 7x+4y=39

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?