Sachi has 238 rocks in her collection. She finds 47 more rocks. Then she gives 159 rocks to her brother. She solves this equation 238 + 47 – 159 = r. She says, “I have 126 rocks left.”

1. Is Sachi’s answer reasonable?

2. How do you know?

3. Use estimation to check her work.

Show your work. There are three parts to your answer. Be sure to share your estimation strategy.

step-by-step explanation:

a rhombus is a parallelogram enjoying his symmetry.

answer: i believe it’s 245.04

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