Answer:
a = 7
Step-by-step explanation:
Using Pythagoras' identity in the right triangle,
The square on the hypotenuse is equal to the sum of the squares on the other 2 sides, that is
a² + b² = c² , substitute values
a² + 2.4² = 7.4², that is
a² + 5.76 = 54.76 ( subtract 5.76 from both sides )
a² = 49 ( take the square root of both sides )
a = [tex]\sqrt{49}[/tex] = 7
