Posted by Anonymous on .
I keep getting 28/19 for this problem, but it doesn't check with the solution in the back of the book. Help please..
solve the equation
7d(1/2)(2d4)=(5/4)(d+4)

MAth 
Anonymous,
7 d  ( 1 / 2 ) ( 2 d  4 ) = (  5 / 4 ) ( d + 4 )
7 d  ( 1 / 2 ) * 2 d  ( 1 / 2 ) * (  4 = (  5 / 4 ) * d + (  5 / 4 ) * 4
7 d  d + 2 = (  5 / 4 ) * d  5
6 d + 2 = (  5 / 4 ) * d  5
6 d + ( 5 / 4 ) d =  5  2
( 24 / 4 ) d + ( 5 / 4 ) d =  7
( 29 / 4 ) d =  7 Multiply both sides by 4
29 d =  28 Divide both sides by 29
d =  28 / 29