What does 9! mean in math?

Andrea went to the store to buy sweater that was on sale for 40% off the original price it was then put on clearance an additional 25% off the sale price she also use a coupon that saved her an additional five dollars and j did not spend more than $7.60 for the sweater what are the possible values for the original price of the sweater?

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

Triangle knm is what is true about the sides of knm