Fred is 4 times as old as Nathan and is also 27 years older than Nathan.
Let f be Fred's age and let n be Nathan's age.
Which system of equations represents this situation?
Choose 1
AIf=4n
If=n- 27
B(f=4n
If=n +27
C(n=4f
n = f +27
D(4f=n
If=n +27

The system of equations is

f=4n  and  f=n+27

Fred's age is 36 years old and Nathan's age is 9 years old

Step-by-step explanation:

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.

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step-by-step explanation: