Anne is a maths student. She has achieved marks of 9 outof 10 for tutorials and 17 out of 25 for her mid semester esam. There are two options for calculation of her final mark. Both options give Annie a final mark of exactly 72%.(adsbygoogle = window.adsbygoogle || []).push({});

F=(t + a + 0.75e)

F=(t + a + m + 0.5e)

a)

Let a be Anne's assignment mark (out of 15) and let e be her final exam mark (out of 100). Write down an equation for her final mark calculation under each option::

For that I get:

72 = 9 + a + 0.75e

63 = a + 0.75e

and...

72 = 9 + a + 17 + 0.5e

46 = a + 0.5e

Is that right?

b) Use matrices to determine Anne's assignment mark and her final exam mark...

For that i get:

|1, 0.75|

|1, 0.5 |

and to find a and e you have to times the inverse and the fraction of ad-bc (-1/4) by 72 and 46. When I do this i get a and e to equal absolutlynothing near what they should be. Have i made a mistake somewhere??

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# Homework Help: Equation in matrix

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