What are the steps to simplify the expression (4+6i)(4−6i)?

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?

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.

Aright triangle has an area of 21 m2. the dimensions of the triangle are increased by a scale factor of 4. what is the area of the new triangle