Question

Number 7? No idea how to do this?

Answer 1

Its looks like there is no question here.  Find x maybe?

the shaded part is a right triangle so we can use Pythagorean theorem

c² = a² + b²

c is the longest side of the or hypotenuse

so I can write it as m² + m² = 9²

m² + m² = 81

2m² = 81

/2          /2  

m² = 40.5

√       √  

m = √40.5 (well its actually = or - but since it really measurement its +)

~ 6.39

since x is to ms its 2 x 6.39