Question

the time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 24 seconds are required to make a 3-by-4 enlargement, find the time required for a 5-by-9 enlargement

Answer 1

radr can you help me after this

Answer 2

Time T varies directly with area A, so:\[T=kA\]Where k is some unknown constant. But we can find the unknown constant using the fact that 24 seconds are required to make a 3x4 enlargement. Thus:\[24=12k ; k=2\]Now we can solve the time needed for the 5X9=45 enlargement:\[T=2(45)=90\]It takes 90 seconds.

Answer 3

24:12::t:45
12t=45*24
t=90

Answer 4

radar can you help me when you are done here
i have hard question

Answer 5

where u at?