Use a calculator to find the value of x to four decimal plac

Use a calculator to find the value of x to four decimal places. If the answer does not exist, enter DNE (a) In(x) = 1.4 Submit Answer Incorrect. Tries 2/99 Previous Tries (b) ln(x) 0.081 7 Submit Answer Incorrect. Tries 1/99 Previous Tries (c) In(40 = 2.5 Submit Answer Incorrect. Tries 1/99 Previous Tries (d) ln(x-0.09) =-2.79 Submit Answer Tries 0/99 (e) ln(5x) =-0.5959 Submit Answer Tries 0/99

Solution

If we have ln(a) = b , then we can write it as a=e^b.
a) Using above formula , we got x=e^1.4

   x = 4.0552

b)
Using above formula ln(x) = 0.0817 can be written as x= e^0.0817

x=1.0851

c) Using above formula. ln(4x) = 2.5 can be written as 4x = e^2.5 => x = e^2.5/4

Which can be written as   x=3.0456

d) ln(x - 0.09) -2.79

x - 0.09 = e^(-2.79)

x = 0.09 + e^(-2.79)

x=0.1514

e)
ln(5x)=-0.5959

5x = e^(-0.5959)

x = e^(-0.5959)/5

x= 0.11021