lanakila lanakila
  • 13-05-2020
  • Mathematics
contestada

khan-academy help please

khanacademy help please class=

Respuesta :

ronhagrid310
ronhagrid310 ronhagrid310
  • 13-05-2020

Answer:

Solve for x^2/2 - 10x = 0

<=> x^2 - 20x = 0

<=> x(x - 20) =0

<=> x = 0(invalid), x = 20

=> After 20s, Rui reaches his lowest altitude

Answer Link
hfranc hfranc
  • 13-05-2020

Answer:

Hello,

x = 10

Step-by-step explanation:

[tex]-\frac{-10}{2\frac{1}{2} } = \frac{10}{1} = 10[/tex]

or :

d(0) = 0

and

d(20) = 0

[tex]\frac{0 + 20}{2} = 10[/tex]

Answer Link

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