3 years ago

1 and 20 are alternate exterior angles true or false

1 answer:

7 0

They are alternate exterior angles. 1 is on the left side of the line and 20 would be on the opposite side of the line since 10 is.

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2 years ago

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Which expression defines the given series for seven terms? –3 + (–1) + 1 + . . .

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$-3+(-1)+1+...\\\\a_1=-3;\ a_2=-1;\ a_3=1\\\\It's\ an\ arithmetic\ sequence\ where\ the\ common\ difference\\is\ equal\ d=a_2-a_1=-1-(-3)=-1+3=2.\\\\a_n=a_1+(n-1)d\\\\a_n=-3+(n-1)\cdot2=-3+2n-2=2n-5\\\\Answer:\boxed{\sum\limits_{n=1}^7(2n-5)}\to\fbox{a.}$