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

Please help!

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

f(x) is   are being squared

g(x) is   increasing by 2

h(x) is adding .25 each time

k(x) is taking the square root

f(x) and k(x) are exponential functions