Marking for brainliest

expressions equal to

60x-45.

you must work out all of the answers and find the

a. 5(12x-9)

b.-5(-12x+9)

c. -15(4x+3)

d. 3(20x-15)

question 5 options:

just c

just b

a and b

a, b and d

b. sorry if i'm wrong!

Step-by-step explanation:

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

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.