You can assemble a shelving unit every 30 minutes. at this rate how long would it take you to assemble 9 shelving units?

so, converting firstly the mixed fractions to improper fractions and then "adding".

the answer is:

the correct option:

b.

to solve the problem, we need to remember how to operate to simplify exponential expressions using the logarithms.

we are given the equation:

then, using placing logarith with base 7 on both sides of the equation, we have:

so, rounding the obtained result to two decimal places (nearest hundreth), we have:

hence, we have that the correct option:

b.

have a nice day!