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b= 1/4a + 1/4b + 1/4c +1/4d

c= 1/2a + 1/2b + 1/4c

a + b + c + d = 1

Here are the answers.

a= 3/16

b=1/4

c=14/48

d=13/48

Any help would be greatly appreciated. I know how to do it by hand. Just not on the ti84 calculator.

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