Which composition of transformations will create a pair of similar, not congruent triangles?

a rotation, then a reflection

a translation, then a rotation

a reflection, then a translation

a rotation, then a dilation

a rotation, then a dilation

Step-by-step explanation:

There are four kinds of rigid motions:  

1) translation 2) reflection 3) rotation 4) glide reflection.

They all create congruent images.

A dilation is a transformation that creates an image that is the exactly same shape as the original, but have a different size.

Thus dilation does not create congruent images.

Hence a composition of a rotation, then a dilation a rotation, then a dilation.

answer: standard form is ax^2 + bx + c = 0

step-by-step explanation:

standard form is ax^2 + bx + c = 0

(2x + 1)(x - 2) = 0

distribute to get into standard form

2x^2 - 4x + x - 2 = 0

2x^2 - 3x - 2 = 0

a = 2, b= -3, c = -2

a is your answer

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.