An item costs $420 before tax, and the sales tax is $12.60 . find the sales tax rate. write your answer as a percentage.

Solve the x in the equation x^2+14x+17=-96

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¯¯¯¯¯¯¯¯)?

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)