si maria y sus hermanos juegan con un juego de 15.000 piezas . han construido un barco con 390 piezas, un avión con 696 piezas y una pista con 3.897 piezas ¿cuantas piezas les quedan ?

i am unable to solve this problem

step-by-step explanation:

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have

i suppose it should be (y=2x-5)

step-by-step explanation:

are you missing something?

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