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The number of real solutions of the equation (9//10)^x=-3+x-x^2 is

Use Graph paper for this question. A survey regarding height ( in cm) of 60 boys belonging to Class 10 of a school was conducted. The following data was recorded. Taking 2 cm = height of 10 cm along one axis and 2 cm = 10 boys along the other axis draw an ogive of the above distribution. Use the graph to estimate the following : (iii) if above 158 cm is considered as the tall boys of the class. Find the number of boys in the class who are tall.

If 3(a+2c)=4(b+3d), then the equation a x^3+b x^2+c x+d=0 will have no real solution at least one real root in (-1,0) at least one real root in (0,1) none of these