Is -2, -12, -60, -120 a geometric sequence?

given,

1st term(a)= -2

2nd term (t2) =-12

3rd term (t3) =-60

4th term(t4)= -120

here common ratio (r)=t2/t1=t4/t3

or, -12/-2= -120/-60

or,6=2

hence,no -12, -60, -120 aren't in a geometric sequence because their common ratio aren't same.

your answer is a

step-by-step explanation:

4*4*4*4=256

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.