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    I've got feeling that I have done this wrong as when I put my answer back in the equation for check up, it gives me a different number.

    does anybody know how to do this?

    Thank you
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    You've got rid of the -0.5T. Try having another go including that and creating a quadratic equation in T, then solving.
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    Umm your 0.5T term just disappeared. You need to solve a quadratic in T, so use quadratic formula/complete the square/factorise.


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    I have done it differently and got this answer. Is that right?


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