TMga2yb

Because when you divide 13 by two, you have 6 remainder 1

The definition of an even number is that it can be divided by two without leaving a remainder

420 is 2/3 of 630

240 is 2/3 of 360

use a scientific calculator, then do arccos of 1/2 (arccos is cos^-1 .  Can be found on many calculators by pressing shift cos)

(y^11)^2=Y^(11*2)=y^22

a) I  2x=5-4y

b) II 12y=6x-15

c) I  x=2.5-2y

d) II 12y=6(2.5-2y)-15

e) II 12y=15-12y-15

f) II 12y+12y=0

g) II 24y=0

h) II y=0

i) I x=2.5

Now as for A,B, C, D and E:

 A) 2y=5 : from h) we get y=0.  therefore 2y=0, and 2y=5 is false.

B) 2x=5 : from i) x=2.5.  Therefore 2x=5 and this is true

C) y+2x<5: from h,i) y+2x=0+5.  5<5 is false, therefore C is false

D) x+2y>5 : from h,i) x+2y=2.5.  2.5<5, therefore 2.5>5 is false

E) 2y-x>5: from h,i) 2y-x=-2.5.  -2.5<5 therefore E is false

35=0.28x

x=125

I  x+y=3

II x*y=1.25

I  x=3-y

II (3-y)*y=1.25

II -y^2+3y-1.25=0

II y^2 -3y+1.25=0

a=1

b=-3

c=1.25

y1,2=  (3+/- sqrt(9-4*1.25))/2

y1,2= (3+/-2)/2

y1=2.5  => x=3-2.5=0.5

y2=0.5 => x=3-0.5=2.5

The numbers : 0.5, 2.5

17/30=0.5666666667

0.566666667*100=56.66666667

Answer:  56.66666667%

X*0.64=9

X=9/0.64

X=14.0625

since they share no common factors, the least common multiple is 15*19=285