Algebra II

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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

  • Algebra II -

    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

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