If this is a quadratic equation what is the answer to x be? x (x-4)-8 (x-4)

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)