A = 53 sq in. Find the value of x. if necessary, round to the nearest tenth

Okay, this makes a bit more sense with the clarifications.

The area of this right triangle is 53 sq inches. Since we need the value of x, we can do the calculation of the area backwards.

53*2 is 106. Since we know the area of this triangle is x^2/2, we'll just get the square root of 106, which is 10.295630141 according to my calculator.

Rounded to the nearest tenth it is 10.3, making c the correct answer.