Evaluate the expressions without using a calculator: 17. log base3 81
18. log base8 1/64
19. log base6 1
20. log base5 5^4
21. log base2 1/8
22. log base8 8^-1/2
23. log base5 (-25)
24. log base4 (.25)
25. log 0.1
26. log base3 1/27
27. log base81 9
28. log base2 1/64

I’m giving 18 points!!

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¯¯¯¯¯¯¯¯)?