Study6076
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Guys, my brain just doesnt work with wordy math problems, i don't even know where to start

for qs 1a) i dont get why the answer is the answer hufff
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bakeshenanigans
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I don't see the question? Is it only with me or is everyone having the same problem
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Study6076
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(Original post by bakeshenanigans)
I don't see the question? Is it only with me or is everyone having the same problem
it's there now
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ghostwalker
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(Original post by Study6076)
Guys, my brain just doesnt work with wordy math problems, i don't even know where to start

for qs 1a) i dont get why the answer is the answer hufff
Look at the shape of the curve in the diagram, and check it against the equation. What do you know about the minimum point in each?
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Study6076
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(Original post by ghostwalker)
Look at the shape of the curve in the diagram, and check it against the equation. What do you know about the minimum point in each?
ahhh that's so clever! so what i got is that because the bridge is shaped like a parabola ( happy face) because the function is postive a is > 0, and the +200 would be the y intercept and that is the y intercept right so the answer to the first qs would be the height of the bridge???
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Study6076
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(Original post by ghostwalker)
Look at the shape of the curve in the diagram, and check it against the equation. What do you know about the minimum point in each?
this is what the mark scheme says
The bridge is 200 m above ground level,
since this is the height at the centre of the
bridge.

explain what???
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ghostwalker
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(Original post by Study6076)
this is what the mark scheme says
The bridge is 200 m above ground level,
since this is the height at the centre of the
bridge.

explain what???
Not sure what you're asking.

The midpoint of the parabola (its minimum - x=0 ) correponds to the point where the cables intersect the bridge, so the 200, which is the height of the cables at that point is the height of the bridge.
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Study6076
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(Original post by ghostwalker)
Not sure what you're asking.

The midpoint of the parabola (its minimum - x=0 ) correponds to the point where the cables intersect the bridge, so the 200, which is the height of the cables at that point is the height of the bridge.
so what does it mean by'since this is the height at the center of the bridge'
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ghostwalker
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(Original post by Study6076)
so what does it mean by'since this is the height at the center of the bridge'
Markscheme should say "The bridge is 200 m above water level, since this is the height at the centre of the bridge."

Since the centre of the bridge is 200m above the water, then the whole bridge is 200m above the water.

We are assuming of course that the bridge is level.
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Study6076
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(Original post by ghostwalker)
Markscheme should say "The bridge is 200 m above water level, since this is the height at the centre of the bridge."

Since the centre of the bridge is 200m above the water, then the whole bridge is 200m above the water.

We are assuming of course that the bridge is level.
thanks for your time and i appreciate you trying to help me but I still don't get it (I'm just dumb - not your fault)!
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ghostwalker
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(Original post by Study6076)
thanks for your time and i appreciate you trying to help me but I still don't get it (I'm just dumb - not your fault)!
Your answer that the 200 represents "the height of the bridge" is correct.

And I would certainly give it the mark.

All the rest is just adding some further detail/justification, which isn't required for the question.
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