To make a square for x²+bx=c, add( 
)²on both side
in this case, b is-3/4, half of b is -3/8, and (-3/8)² is 9/64, so you add 9/64 to both side.
in this case, b is-3/4, half of b is -3/8, and (-3/8)² is 9/64, so you add 9/64 to both side.
S is inversely proportional to t . When s = 0.9 , t = 2 Work out t when s = 30
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Hope this helps. Look at attachment
