12. a photocopier enlarges by a ratio of 7: 4. a picture
measures 6 cm by 4 cm. how many consecutive
enlargements can be made so that the largest possible
picture will fit on a sheet measuring 30 cm by 20 cm?

2 enlargments

Step-by-step explanation:

Use proportion for each enlargment you do

Side a=6cm                      Side b=4cm

6:4=x:7                             4:4=b1:7

7*6=4a1                             b1=28/4

a1=42/4                              b1=7 after first enlrge

a1=10.5 after first enlarge        7:4=b2:7

10.5:4=a2:7                         b2=49/4

a2=73.5/4                           xb2=12.5 after 2nd enlarge

a2=18.375  after 2nd enlarge                          

                                             12.5:4=b3:7

18,375:4=a3:7                       b3=21.875 cm after 3rd enlargement

a3=32.15after 3rd enlargement

Values after 3rd enlargement are higher than dimension given for picture wall

30 cm by 20 cm

answer: the dogs need to shift their focus to human scent.

its because the dogs being trained are for search and rescue thus they need to be able to track humans and their specific scent

step-by-step explanation: