Question

Solve, round to 4 decimal places if necessary:

3.9^m-4=10.21

Answer:
(m-4)In(3.9)=In(10.21)
m(In3.9)-4(In3.9)=In(10.21)
m=(In10.21)+4(In3.9)/In3.9
m=7.7672/1.3609
m=5.7074

e^3x>=21

Answer:
Ine^3x>=21
3x=In21
x=In21/3
x=1.0148

Thanks

Answer 1

method right for first one but I did not do the arithmetic

however
e^3x>=21

Answer:
Ine^3x>=21 You mean ln 21
3x=In21
x=In21/3
x=1.0148 You forgot the "greater than" part