A scientist determines that an antibiotic reduces a population of 20,000 bacteria to 5,000 in 24 hours. Find the rate of decline caused by the antibiotic.

5.8%

Step-by-step explanation:

H= 1/r (in P - in A)

H=24

P=2000

A=5000

24= 1/r (in2000 - in5000)

24r = in 2000 - in 5000

r = in 2000 - in 5000

24 r

= 05 .7762265

= 5.8 %

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.