Find the amount of time that has elapsed. Assumed that the given below are of the same day. write your solution. 1.From 1:40 a. m. to 3:40 a. m.

2.From 4:45 p. m. to 9:30 p. m.

3.From 7:15 a. m. to 9:30 a. m.

4.From 11:34 a. m. to 4:15 p. m.

5.From 3:05 a. m. to 7:20 p. m.​

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.

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).