I really need help with these three ASAP!!!

Question

Calculate log3 100 (where log3 means log to the base 3). Rewrite as a logarithm to the base 2.
 

log3 100 = 4.1918 = log2 18.2750

log3 100 = 4.6416 = log2 24.9609

log3 100 = 3.3333 = log2 10.0791

log3 100 = 0.2386 = log2 1.1798

log3 100 = 4.1918 = log2 2.0474
 

Calculate log2 64 (where log2 means log to the base 2). Rewrite as a logarithm to the base 8.
 

log2 64 = 6 = log8 262144

log2 64 = 6 = log8 48

log2 64 = 6 = log8 1.5

log2 64 = 1.8062 = log8 42.7722

log2 64 = 1.6667 = log8 32.0032
 

Calculate log5 42 (where log5 means log to the base 5). Rewrite as a logarithm to the base 8.
 

log5 42 = 0.4306 = log8 2.4483

log5 42 = 2.3223 = log 210.0390

log5 42 = 0.4306 = log8 3.4448

log5 42 = 2.3223 = log8 18.5784

log5 42 = 2.3223 = log8 125.0967

Answer 1

log3(100) = 4.19 = log2(2.04), the last choice looks likeliest

3^4 = 81, 2^2 = 4

so log base 3 is a little over 4, and log base 2 is a little over 2

log2(64) = 6 log8(64)=2 log8(8) =1, log8(512)=3, log8(4096) = 4, log8(32764) = 5, log8(262144) =6

log8(1024) = log2(64)

since 8^6 = 262,144 and 2^=64

log5(42) = about log8(125), last option