Question 56156
7^a + 4 = 115.  If necessary, round to the nearest hundredth
:
7^a = 115 - 4
7^a = 111
:
Log equiv of exponents
a * log(7) = log(111)
:
a * (.8451) = 2.0453
:
a = 2.0453/.8451
:
a = 2.42 rounded
:
Check on a good calc: 7^2.42 =  110.9525, pretty close