Of the 34 students in a class there are 2 fewer students with blue eyes than there are with hazel eyes. also there are twice as many students with brown eyes. which of these is either the number of students with blue eyes the number of students with brown eyes or the number of students with hazel eyes. select all that apply. A. 8
B. 10
C. 12
D. 16
E. 20
F. 34​

D

Step-by-step explanation:

bl  is blue eyes     h = hazel eyes      br = brown eyes

eq 1)    bl + h + br  = 34                sum of all the students

eq 2)   bl +  2  =  h                       blue eyes plus 2 equal hazel eyes

eq 3)   br  =  2( bl + h )                 there are twice as many brown eyed student

                                                    as blue eyed and hazel eyed students

eq 1)    bl + h + br  = 34                  substitute for h in    eq 2)  bl + 2  =  h      

           bl + (bl + 2) + br  = 34

eq 4)    2bl + 2 + br  = 34            a new equation is created without h

eq 3)     br = 2(bl + h)                     substitute in  for h into eq 3) using eq 2)

             br  = 2bl + 2h                  remember eq 2 was  be + 2  =  h

             br  = 2bl + 2(bl + 2)

eq 5)      br  = 4bl + 4                    another eq WITHOUT h

now solve eq 4) and eq 5)        by subsitition  

eq 5)      br  = 4bl + 4                 sub bl into eq 4)

eq 4)     2bl + 2 + br  = 34  

            2bl + 2 + (4bl + 4)  = 34           ONE equation with ONE unknown

                                                                solve for bl

            2bl + 4bl  + 2  +  4    = 34

                  6bl + 6   =  34

                  6bl + 6 - 6   =  34  -  6

                  6bl    =  28

                  3bl     =  14

                   bl    = 14/3  =   4 2/3         so who has the 2/3 eye???

     none of these numbers match the solution options

need to check my answer for sure my math was correct                    

  bl + h + br  = 34        bl = 14/3      

                                    eq 2)   bl +  2  =  h       14/3 + 6/3  =  h      h  = 20/3

                                    eq 3)   br  =  2( bl + h )

                                               br = 2(14/3 + 20/3)

                                               br = 2(34/3)

                                               br = 68/3    

     bl    +     h    +     br       =       34

   14/3  +  20/3  +   68/3  =    102/3         102/3  = 34        the numbers check

  i suspect the equation was typed incorrectly    

if the total number of students were 36

               blue eyes   =   5

               hazel eyes  =   7

               brown eyes   =  2 times (5 +7)   =  24

          5 + 7 + 24 = 36

     again none of these numbers match option

if the total number of students were 24

               blue eyes   =   3

               hazel eyes  =   5

               brown eyes   =  2 times (5 +7)   =  16                    D = 16

          3 + 5 + 16 = 24

answer: what do you mean

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this