# math

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

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1. 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

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2. 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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