It would be 4.9 because you would use a^2+b^2=c^2. The hypotenuse is always c^2. Write this our as x^2+5^2=7^2. Break these down so its x^2+25=49 you want the x alone so you'll subtract 25 from both sides which in the end is x^2=24 You want to get rid of the exponent so you place √ in front of 24. In the end it looks like x=√24 Plug it into a calculator and it'll give you 4.89. Round it and it'll give you answer A (4.9cm)
