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Solve 9x/(7- 6x) = 15

Solution: 9x/(7- 6x) = 15 Cross multiply 9x = 15(7-6x) 9x = 105 - 90 x 99x = 105 x = 105/99 = 35/33 Hence the value of x is 35/33.... View Article

Period of cos x is

(a) 2π (b) π (c) π/4 (d) none of these Solution: The period of cos x is 2π. The period of a periodic function is the interval of... View Article

Find the cube of 21.

Solution: The cube of a number means a number multiplied by itself three times. So we multiply 21 by itself 3 times. 213 = 21×21×21... View Article