Sarah is a world-class diver in the women's 4-m springboard
competition. Her height, h (in
metres), above the water t
seconds after she leaves the
board is given by
h = -4.9t2 + 1.1t+4
How long is Sarah in the air before she reaches the water? Make sure
to round your answer to thenearest tenth.

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im not sure

guess at question:

a vertical line intersects the graph of g(x,y) = 0 at two points. what conclusion follows about the function f(x) implicitly defined by g(x,f(x)) = 0?

the domain of f(x) cannot include the x coordinate of any such vertical line.

informally, f(x) is not a function, and

g(x,y)=0 cannot be solved for y uniquely.

the relation r = {(x,y) such that g(x,y) = 0} is a function if

for all (a,b) ∊ r and (c,d) ∊ r, a=c implies b=d.

step-by-step explanation:

2,160 π

step-by-step explanation: