anonymous
  • anonymous
You throw a ball straight up from a rooftop. The ball misses the rooftop on its way down and eventually strikes the ground. A mathematical model can be used to describe the relationship for the ball's height above the ground, y, after x seconds. Consider the following data:
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
D. y = -16x2 + 80x + 50
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anonymous
  • anonymous
@JoannaBlackwelder your gonna earn a ton of medals today lol
anonymous
  • anonymous
for this my answer was d but i wasnt sure if it was right

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JoannaBlackwelder
  • JoannaBlackwelder
Haha, looks like I may be getting a bunch of medals. :-) But I don't think that equation models all of the data.
anonymous
  • anonymous
so d is not right or what
JoannaBlackwelder
  • JoannaBlackwelder
No, that model doesn't fit the data.
anonymous
  • anonymous
hold on ill explain what i did
JoannaBlackwelder
  • JoannaBlackwelder
Ok
anonymous
  • anonymous
the one thing I do notice is that since this is parabolic, everything will be symmetric about the vertex. Now the vertex is -b/2a. Now I also notice that 1 and 4 have the same value, which means the vertex HAS to be in between 1 and 4. The middle of 1 and 4 is 2.5. So what this means is that -b/2a has to equal 2.5. Only two of your answers meet that condition, a and d.Now between a and d, you would just need to plug in values. f(1) should equal 114. Looks like they do for a and d. Now to check f(2). Looks like only d works for f(2) so the answer is d
anonymous
  • anonymous
does that make since
JoannaBlackwelder
  • JoannaBlackwelder
Yeah, your statement makes sense, except that I don't get f(2) to be 146.
anonymous
  • anonymous
why whats confusing you
JoannaBlackwelder
  • JoannaBlackwelder
Oh, you're right! I made a typo. :-) That function does match the data!
anonymous
  • anonymous
ok thnx i just wanted to make sure my work waqs good
anonymous
  • anonymous
on to your next metal lol
JoannaBlackwelder
  • JoannaBlackwelder
Yep, no worries :-)

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