A group of workers can plant 2/3 acres in 7/8 days.
What is the unit rate in acres per day?

16/35 acres in one day

Step-by-step explanation: in 1/8 of a day they plant 2/35 of an acre

so multiply 1/8 by 8 to get one day next do this to the rest of the problem

2/35 times 8 is 16/35 so that is the answer

mn(x) = 5x³ + 9x² + 15x + 27

Step-by-step explanation:

mn(x) = m(x) × n(x)

mn(x) = (x² + 3)(5x + 9)

We can evaluate this expression by using the FOIL method.

First terms:    x² × 5x = 5x³

Outer terms: x² × 9    =        +9x²

Inner terms:  3 × 5x    =                 +15x

Last terms:   3 × 9      =                           +27

                       mn(x) = 5x³ + 9x² + 15x + 27