Question 63891
s/pn-ps/n
1.4/(3.5*2)-(3.5*1.4)/2
1.4/7-4.5/2
.2-2.25=-2.05 answer
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pn/s+s/n
3.5*2/1.4+1.4/2
7/1.4+.7
5+.7=5.7 answer