math

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can someone check my answers please


subtract
-7.1-(-8.3)= 1.2

multiply
(7.6)(1)(-6)
= -45.6

divid
90/18 = 5

find the reciprocal of 1/3 (9-4= 5/3


-15-(-12)
----------
-18-(-18)
undefined

  • math -

    subtract
    -7.1-(-8.3)= 1.2
    ok

    multiply
    (7.6)(1)(-6)
    = -45.6
    OK

    divid
    90/18 = 5
    OK

    find the reciprocal of 1/3 (9-4= 5/3
    A parenthesis is missing and I don't understand the problem. If it is
    (9-4)/3 = 5/3 and the reciprocal is 3/5. If it is 1/[3*(9-4)] = 1/15 and the reciprocal is 15.


    -15-(-12)
    ----------
    -18-(-18)
    undefined
    OK

  • math -

    divid
    90/18 = 5
    I might have said the answer was 5.0 since there are two significant figures each in 90 and 18 so you are allowed 2 s.f. in the answer. I don't know if you have had anything about s.f. or not.

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