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Can you guys help me with 3-8 please thank you <3

Can you guys help me with 3-8 please thank you <3-example-1

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For number 3 The rest are all the same just with different numbers):


R_(ave)=(f(b)-f(a))/(b-a)

R_(ave)=(f(3)-f(1))/(3-1)

R_(ave)=((2(3^(2))-20(3))-(2(1^(2))-20(1)))/(2)

R_(ave)=((2(9)-60)-(2(1)-20))/(2)

R_(ave)=((18-60)-(2-20))/(2)

R_(ave)=((-42)-(-18))/(2)

R_(ave)=(-24)/(2)

R_(ave)=-12

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