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REY [17]
4 years ago
9

Please help me! Thanks!

Mathematics
1 answer:
Lena [83]4 years ago
8 0
Answer is 9

A(x)=f(b)-f(a)/b-a

where a=-10 b=10
f(x)= x^2+9x+18

f(a)=(-10)^2-90+18=28
f(b)=208
A(x)=208-28/10+10
A(x)=180/20=9
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