Hi im so sorry to bother you but can someone please help me with this please I’ll give you the if it’s correct im so sorry

If the measure of xyz is 81 what is the measure of yz

Maria donates a fixed amount, a, to a charity each month. if she donates $300 in 12 months, what is the equation for a? a. a + 300 = 12 b. a × 300 = 12 c. a × 12 = 300 d. a + 12 = 300 e. a + 32 = 100

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.