...radic;x y=k/√x ,where k is constant. If x increase by 44%, x( new )=( 1 + 0 .44)x=1.44x y( new )=k/√(1.44x) =k/(1.2√x) The percentage...
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...amount of copper in the new alloy: 0.37 x + 0.5 y The amount of zinc in the new alloy: ( 1 - 0 .37) x + ( 1 - 0 .5) y = 0.63 x + 0.5 y Now, the required...
...volume of original balloon =(r2/r1)^3 =0.8^3 =0.512 so the % decrease of volume of new balloon = 1 - 0 .512 =0.488 =48.8% 2 the radius of the Earth is 6400km...
...5x^2-10x+5) 9x^2-42x+49=25x^2-50x+25 16x^2-8x-24=0 2x^2-x-3=0 (2x-3)(x+ 1 )= 0 x=3/2 or x=-1 y=-2 , y=3, radius = √[(-1-1)^2+(2+2)^2]=√20 so the...
...be(4x+1)(x-9). Either 4x+1 or x+9 equals to 0. If 4x+ 1 = 0 , x equals to -1/4. If x-9=0, x equals to 9. 9+(-1/4)=8...
...original cost of that thing is A, Sold at 20% discount: The new cost = A x ( 1 - 0 .2) = 0.8A There is a further discount...
...1+x)，所以1+x不可以=0，因此x≠-1 b) x不可能=x+2 X/(X- 1 )= 0 Ans： X=0 Reason： a) 當x=0，x-1=-1≠0，所以兩邊...
... heated to 10 deg.C, the new volume is, V( new ) = 5x[ 1 + 0 .53x10^-4(10-5)] mL = 5.001325 mL