Physics Please someone help please

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A 34 g glass thermometer reads 21.6°C before it is placed in 135 mL of water. When the water and thermometer come to equilibrium, the thermometer reads 38.7°C. What was the original temperature of the water?

-.135(4186)(Tf-38.7)=.034(840)(Tf-21.6)
=-565.11Tf+21869.752=28.56Tf-616.896
solve for Tf
Tf= 37.88 degree celcius but its wrong please help!

thank you

  • Physics Please someone help please -

    m1•c1•(38.7-21.6) = m2•c2•(t-38.7)
    m2 =ρ•V =1000• 135•10^-3•10^-3 =0.135 kg,
    c1 =840 J/kg , c2 = 4180 J/kg.
    t -38.7 = 0.034•840•17.1/0.135•4180 = 0.865 oC.
    t = 38.7+ 0.865 =39.57oC

  • Physics Please someone help please -

    A 30 g glass thermometer reads 21.6°C before it is placed in 135 mL of water. When the water and thermometer come to equilibrium, the thermometer reads 38.1°C. What was the original temperature of the water?
    Please provide step by step equation and answer

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