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Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

The height of a triangle is 4 in. greater than twice its base. the area of the triangle is no more than 168 in.^2. which inequalitycan be used to find the possible lengths, x, of the base of the triangle?

Aquadratic equation in standard from is written ax^2= bx+c, where a, b and c are real numbers and a is not zero?