What is the solution to 2x^2+8=x^2-16?

If 20% of a number is 35, what is 50% of that number?

What is the order of magnitude for the number of liters in a large bottle of soda served at a party

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¯¯¯¯¯¯¯¯)?