Which of the following is equal to the rational expression when x cannot equal 5 or -1.
(x-7)(x+1)/(x+1)(x-5

Explanation:

We have a pair of (x+1) terms. One is up top in the numerator. The other is down below in the denominator. The pair of terms cancel out when we divide. So we go from this

( (x-7)(x+1) )/( (x+1)(x-5) )

to this

(x-7)/(x-5)

after the cancellations.

The "x cannot equal 5 or -1" is to ensure we don't have division by zero errors.

dnji

step-by-step explanation:

dskfbipo

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.