30 centimeters equals approximately 1 foot. 30.48 centimeters equal exactly 1 foot. 1 foot .984942 feet 11.81102 inches 0.328083 yards .3 meters .03 dekameter .003 hectometers 300 millimeters 0.0003 kilometers
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x + 30 = 64 Therefore, x = 64 - 30 x = 34
Substitute 2x - 6 for y in first equation: 12x - 5(2x - 6) = 30 ie 12x - 10x + 30 = 30 so 2x = 0 making x = 0 and y = -6
0.45
As x ∝ yz2 then x = kyz2 where k is a constant. Substituting the given figures, 40 = k*20*22 = 80k Then k = ½ and the formula is, x = ½yz2 So, x = ½ * 30 *32 = 135
4x+6x=30 is the same as: 10x=30 so we divide by 10 and get: x=3 (I do not see how this relates to calculus, but O.K.)