Erika is working on solving the exponential equation 50^x = 17; The solution is x = 0.7242.
<h3>What is logarithm?</h3>
When you raise a number with an exponent, there comes a result.
Let's say you get
a^b = c
Then, you can write 'b' in terms of 'a' and 'c' using a logarithm as follows

'a' is called base of this log function. We say that 'b' is the logarithm of 'c' to base 'a'
Erika is working on solving the exponential equation 50^x = 17;
however, she is not quite sure where to start.
The equation is

By taking the log both sides

By using the base formula

So, 

x = 0.7242
Learn more about logarithm here:
brainly.com/question/20835449
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Answer:
Step-by-step explanation:
3 times 12 equal 36.
36 minus 15 equals 21.
So Joaquin uses 21 light bulbs.
20x + 15k is the answer we just have to remove the bracket and add the terms
hope it helps
Option A ( 2 , 4 , 6 , 8) because domain are x values
Real number, rational number