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correction.x^2 = 4.The square of both a positive or a negative real number is positive.x = + 2 or x = -2.

Vol of sphere = 4/3 x pi x 15 x 15 x 15

Vol of x cones = x * pi * 2.5 * 2.5 * 8 * 1/3

Now solve.

Yes :)

Nope.

(5x1) , (1x5)

the value is cos 75 cos 15 - sin 15 sin 75.which is sin 15 cos 15 - cos 15 sin 15.which is sin (15-15)which is sin 0 = 0.answer = 0.

1.6 <=x < 3.no solution set since x belongs to real numbers just plot the number line.

Prices of related goods remain unchanged.

Actually they should have given grace marks.C4H10 and not C4O10

Observation.(Rotten egg smelling gas etc etc)