- What is the sum of the measures of the interior angles of a polygon with five sides?

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7^(x+1) + 7^x + 7^(x-1) = 399, what is x? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? White light is directed at difraction grating at angle normal to gratting.starting at norml to grating 0dgre the odr of red,gren,blue wil be? Solve the equation for x.
e^x = 85? Describe how and where new crust material is made. Describe how and where old crust is destroyed.?