Question

I need help with math.

Answer 1

last option

Step-by-step explanation:because 9x9 is 81 subtract 1 and you get 80 5x5=25-1=24 so that wont work 4x4=16-1=15 so that also wont work and 7x7=49-1=48 so -9 and 9 is the right answere