Question 691708
    if h(r)= 2/3r-6, what is the value of h(-9)? 
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substitute -9 for r and solve:
h(r)= 2/3r-6
h(-9)= 2/3(-9)-6
h(-9)= 2(-3)-6
h(-9)= (-6)-6
h(-9)= -12