Question

log2^3approx1.5850 and log2^5approx2.3219 find approx value of log2^15

Answer 1

here's something that might help
log (MN) = log M + log N
log (15) = log 5 + log 3
(all base 2)

you're given log_2 5 and log_2 3, so log_2 15 will just be their sum: 3.9069

*****
log_10 19 is already a common log (base 10)
punch calculator buttons to find log 19

Answer 2

i dont have a calculator that does that