Matt weighed 60 pounds when he was 8. He now weighs 80 pounds. Find the percent of increase in weight rounded to the nearest tenth. A. 20% B.25% C.30% D.33.3%

D.33.3%

Step-by-step explanation:

A)60×.20=12

B)60×.25=15

C)60×.3=18

D)33.3% of 60 is 19.8. 60+19.8=79.8

if you round it up,it'll equal to 80

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.

add an image

step-by-step explanation: