Help me please !! In the spring you decide to start cleaning your room on a weekly basis. The first cleaning takes you 135 minutes. You notice for watch cleaning after that, you decrease the time it takes from the week before by 20%. After 4 weeks, how long will it take you to clean your room? Round your answer to the nearest minute.

69

Step-by-step explanation:

first 135

second 135 - 20% = 135 - 27 = 108

third 108 - 20% = 108 - 21.6 = 86.4

fourth 86.4 -20% = 86.4 -17.28= 69.12

rounded 69

i am sure it will be 90 degrees.

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