Maths, Addmaths and Statistics: Post your doubts here!

how to do the highlighted question?

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Zeerak 420

Ok so this question is tough.

Speed of sparrow is x km/h in STILL air.

When wind is blowing at 1 KM/H, sparrow takes 5 hours to fly 12 km to nest and 12 km back again. She goes out directly into win and returns with wind behind her. Find Normal speed.

Last edited:

aneeqgenius7

Voulme of cylinder = pi r^2 h
Volume of outter cylinder(VO) = pi (3.5 + r)^2 (20)
volume of inner cylider (VI)= pi r^2 (20)
Volume of solid = VO - VI
3000 = VO - VI
Solve for r
r = 5.07
thanks

rid_aaaa

can anybody please explain questions related to upperbond and lowerbond

Thought blocker

can anybody please explain questions related to upperbond and lowerbond
Post the question. We will see where we can help u.

thank you so much

part b anyone?

4024_s15_qp21_q2

Enferno

You cant use cos rule here. How to solve without that.

A*****

You cant use cos rule here. How to solve without that.
But y can't v use it? It's not written in the question that v can not use it

A*****

I don't think that there is any other way of solving it

Enferno

But y can't v use it? It's not written in the question that v can not use it
I mean yes we can use it here. I'm looking for a way to solve without it.
Now I don't think there is.
Thank you by the way

A*****

I mean yes we can use it here. I'm looking for a way to solve without it.
Now I don't think there is.
Thank you by the way
No there isn't... in the mark scheme as well the same one is given

Anon_Assassin

can anybody please explain questions related to upperbond and lowerbond
We always use this in finding the area of a graph. (UPPERBOUND - LOWERBOUND)
For example in this graph,

We will find the area by subtracting the blue curve from the red curve.
This is also used when a line intersects the graph at more than two points.