Im not sure on this question can someone answer this?

Step-by-step explanation:

(19+7)÷(2×6+1)

Let's assume the mat as a right triangle Taking length of triangle be x so height = x-21 and hypotenuse= x+6 for right triangle we can apply pythagoras theorem so (x+6)^2=x^2+(x-21)^2 expanding we get x^2 + 12 x + 36 = 2 x^2 - 42 x + 441 solving for x we get x=9,45 But for length to be 9 height will be negative So the length of mat will be 45 inches