In exercise, solve the equation.
ex– 1 = 9

x = ln 10

Step-by-step explanation:

You meant e^x - 1 = 9.  Let's isolate e^x, by adding 1 to both sides.  We get:

e^x = 10

Now make use of the property ln a = b  <=> a = e^b

Then e^x = 10 becomes  

x = ln 10

answer: it is 8

step-by-step explanation:

you know why its 8

step-by-step explanation:

the triangles are similar. therefore the corresponding sides are in proportion:

              cross multiply

            divide both sides by 32