Jeanette purchase a concert ticket on a website the original price of the ticket was $75 she used a coupon code to receive 20% discount the website applied a 10% service fee to the discounted price jeanette stick it was less than the original price by what percent

10%

Step-by-step explanation:

20%=20/100=0.20

 75$x.0.20=15$

 The price when she received a 20% discount was:

 75$-15$=60$

 Then, the web site applied a 10% service fee to the discounted price, so you have:

 10/100=0.10

 75$x0.10=7.5$

 60$+7.5$=67.5$

 So, if 75$ is the 100% of the price, what percentage represents 67.5$?

 75$100%

 67.5$x

 x=67.5 x 100/75

 x=90%

 Then,

 100%-90%=10%

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.

i belive those are the ones that are under 90 degreese.