Can anyone help Boots out? When it comes to math, Boots is no pile of bananas.

Name the most appropriate metric unit for each measurement like a length of an carrot

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¯¯¯¯¯¯¯¯)?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.