8) help pls I have the answer I just need to show the work Which trigonometric function would you use to find “h”, the height of the tree?

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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¯¯¯¯¯¯¯¯)?

Having a hard time understanding this question (see attachment).

Asmall book publisher knows that 26 books weigh 41 lbs. how much do 40 books weigh?