The answer is:  " -21 " .
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We are asked to solve for: "6t" ; which is: "6 * t" .
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Given:  3t − 7 = 5t ;  Solve for "t" ; then solve for "6t" ;
     3t − 7 = 5t ;   Subtract "3t" from each side of the equation;
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    3t − 7 − 3t  =  5t − 3t ; 
to get:  -7  = 2t  ;
Divide EACH side of the equation by "2" ; to isolate "t" on one side of the equation; and to solve for "t" ;
-7/2 = 2t / 2 ; 
-3.5 = t  ;  ↔  t = - 3.5 ;
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Now, solve for "6t" ; 
  6 t = 6*(-3.5) = - 21 .   The answer is:  " -21 " .
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Answer:
C
Step-by-step explanation:
There are 140 women in the 5% sample. to find an estimate of all the women we can multiply but by 20. 5% x 20 = 100%. 140 x 20 = 2,800.