Nick o’ time, the plumber, charges $30 per hour. his brother ivan, the plumber’s , charges $20 per hour. nick starts working on a job. four hours later ivan joins him and both work until the job is finished. if they make a total of $470, how long did they work together?

7 hours

They worked together for 7 hours ($350 + $120)

answer: 7

step-by-step explanation:

step-by-step explanation:

given expression is .

now we need to simplify the given expression .

we know that square root is equivalent to the power 1/2. so that means we can take half of the exponents to get the square root of given expression.

expanding that will give a very very large number so let's keep answer in exponent form.