Ques 23

Ques 23 o o o o o o o o o o o Q22. Q23. Q24. Q25. Q26. Q27. Q28. Q29. Q30. Q31. Q32. Q33. Q34. Q35. o ooo o What must be added to the polynomial (x) =x4+ 2x3-2x2•+x-l so that the resulting polynomial is exactly divisible by x-2+ 2x-3? A boy standing on a horizontal plane finds a bird flying at a distance of 100 m from him at an elevation of 300.A girl standing On the roof Of 20 m high building finds the angle Of elevation of the same bird to be 450.Both the boy and the girl are On the opposite side of the bird .Find the distance of the girl from the bird. The angle of elevation ofa cloud from a point 60 m above the lake is 300and the angle Of depression of the reflection of the cloud in the lake is 600. Find the height of the cloud. A bridge across a river makes an angle of 450 With the river bank.lf the length of the bridge across the river is 200 m, what is the breadth ofthe river? A pole 5m high is fixed on the top Of a tower. The angle Of elevation Of the top of the pole as Observed from a point A on the ground is 600 and the angle of depression of the point A from the top Of the tower is 450.Find the height Of the tower. Sum Of sixth and ninth terms Of an A.p is 101 and the sum Of the tenth and sixteenth terms is 178.Find the first three terms Of the A.P. Solve the equation : If a person had walked I km/hr faster, he would have taken 15 minutes less to walk 3 km.Find the original rate of his walking. A motor boat whose speed is 20 km,'hr in still water ,takes one hour more to go 48 km upstream than to return downstream to the same spot.Find the speed of the stream. sum Of n, 2n, 3n terms Ofan A.P are s I , S2 , S3 respectively.prove that S, = 3(S2- SD. One year ago,a man 8 times as old as his son.Now his age is equal to the square of his son's age-Find their present ages. Swati can row her boat at a speed Of 5 km/hr in still water. If it takes her I hr more to row the boat 525 km upstream than to return downstream, find the speed of the stream. Rs, 6500 were divided equally among a certain number of persons _ Had there been 1 5 more persons,each would have got Rs.30 less.Find the original number Of persons. If the sum of the zeroes Of the quadratic polynomial 2t+3k is equal to their product , find the value Of k. o o o VS- DWRKA. mw o o o o o o o o o o o o o

We have the following situation-

In triangle ABC

So,

AF = h - 20

 = 30 m

Now in triangle AEF,

Therefore the distance between the girl and the boy is

= x + y

  • 6
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