This weekend, they plan to ride a bicycle with a total mileage of 3 3/4. If they travel 2 1/4 miles and take a break, how many miles will they need to travel?

1 1/2 miles

Step-by-step explanation:

Total mileage needed = 3 3/4 mies

Amount taken = 2 1/4 miles

Amount they still need to travel = Total-amoutnt taken.

Amount they need to travel = 3 3/4 - 2/1/4

Convert to improper fractions

Amount they need to travel = 15/4-9/4

Amount they need to travel= 6/4

Amount they need to travel = 1 2/4

Amount they need to travel= 1 1/2 miles

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.