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what is the area of the following trapezoid?

280 mm2
420 mm2
140 mm2
210 mm2

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with