Question 629586
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Hi,
 y= -[x-10]^2+75  ||Parabola opening downward,  V(10,75)maximum point 
 max height the diver is above the water = 75m

the vertex form of a Parabola opening up(a>0) or down(a<0), {{{y=a(x-h)^2 +k}}} 
where(h,k) is the vertex  and  x = h  is the Line of Symmetry
The standard form is {{{(x -h)^2 = 4p(y -k)}}}, where  the focus is (h,k + p)