Is −5 a solution to the equation 6 + 5 = 5 + 8 +2? PLS HELP

This question awards 100 ! i really don’t want to fail i will also mark you !

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¯¯¯¯¯¯¯¯)?

Asphere has a diameter of 10 in. what is the volume of the sphere?