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~Proch~
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I'm a french dude so don't judge me :)
-Children are slowly disappearing -Children began disappearing -Children began to
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Alright thanks !
From 1990 - 2000 = 10 years 43,1 * 10 = 431. 1529,6 - 431 = 1098,6 F(x) = 1098,6 + 43,1x X = number of years
8*9 ?
-6 - (-4)/ 2 - (-1) = -2 So f(x) = -2/3x + b __ 3 Take a point to find b -6= -2/3(2) + b -6 = -4/3 + b -14/3 = b f(x) = -2/3x - 14/3
Actually sorry. It's -4(2) + b(3) = 10 -8 + b(3) = 10 b(3) = 18 b = 6 I mixed X with Y
-4(3) + b(2) = 10 -12 + b(2) = 10 b2 = 22 b = 11
True. Sorry I'm french, so I kinda did a translation from all I learned in french. I mixed up mass number and atomic mass.
7x = -35 x = -5 ??
y= -2 is one part of the point on the graph 4x+3y = -18 4x+3(-2) = -18 4x -6 = -18 4x = -12 x = 3 The intersection point would be (3,-2)
3x-2y = -5 4x+3y = -18 - - - - - 12x-8y = -20 12x+9y = -54 Now you just have to subtract normally. 12x - 8y = -20 - 12x + 9y = -54 ------------- 0 -17y = 34 y = -2 From there, you can find the X
The atomic mass minus the atomic number = the number of neutrons. Let's take Sodium Mass - number = number of neutrons 23 - 11 = 12 The atomic mass is also used in mole calculation of substances.
y = -0,5(x+4)+5 y = -0,5x - 2 + 5 y = -0,5x + 3 Actually, when you have a negative number before a bracket, you have to change the signs in the bracket. So because of the -0,5, the X (which is positive) becomes negative and the +4 (wich is positive)
Did a typo, sorry. C = 12 I wrote 16 But I guess you know how to solve it
16(12)+ 1(22) + 16(11) = 192 + 22 + 176 = 386g/mol 270/386 = 0,70 moles Sorry I'm doing this by memory, so I'm not sure of the molar mass. But 270g of C12H22O11 = About 0,70moles Proch
