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Please help me with these questions....

Please help me with these questions.... For what value of k will the graph of pair of linear equations 2 x - (k + 1) y k and x- ky= -1 be intersecting? Q25: The angle of elevations of top of the first building from the top and bottom of the second building are 300 and 450 respectively. Find the ratio of the height of second building to that of the first building. If the ratio of the radius of a cone and a cylinder of same volume is 3:5, then find the ratio of their heights. Q26: Use the following information to answer the next question. In the given figure, prove that LRAO = 900 - 2LRCO Q22: 16 x a A number is of the form . Find 3600 the smallest value of a for which the number will have a terminating decimal expansion. Q28: Find the roots of the equation 2x2- 7x+ 3 using the method of completion the square.

Dear Student,

Q. 28.Given equation: 2x2 - 7x + 3 = 0⇒ 2x2 - 72x + 32 = 0⇒ x2 - 274x + 32 = 0⇒ x2 - 274x + 742 - 742 + 32 = 0          Using method of completing the squares⇒ x - 742 - 4916 + 2416 = 0⇒ x - 742 - 2516 = 0⇒ x - 742 - 542 = 0⇒ x - 74 + 54x - 74 - 54 = 0⇒ x - 12x - 3 = 0⇒ x = 12, x = 3

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