Angela has a monthly gross income of $3000 and her expenses are $1,200. what is her back-end ratio

Her back-end ratio is 40%.

Step-by-step explanation:

Back-end ratio is ratio, that indicates what portion of a person's monthly income goes toward paying debts. The formula is (Total monthly debt expense / Gross monthly income) x 100

So..1,200/3000=0.4

0.4*100=40

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.

30 units^2

step-by-step explanation:

area is l × w

the length is 3

and the width is 10

3 × 10= 30 units squared