For what value is the fraction 15-x/x+1 undefined?

-1

Step-by-step explanation:

if x is equal to -1 then it will be like this

15-(-1)/-1+1 ➡ 16/0 a number divided by 0 is undefined.

x = -1

Step-by-step explanation:

I think you mean (15 - x)/(x + 1).

If so, then the denominator cannot equal zero.

Set the denominator equal to zero, and find x.

That will be the x value that makes the fraction undefined.

x + 1 = 0

x = -1

x = -1

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.