Please help will give brainliest Mary is doing research on bird migration. Last week she counted 12 migratory birds in her yard. This week she counted 10. What was the percent decrease in birds this week? please show work!

Step-by-step explanation:

Scientists and birdwatchers are reporting a mass die-off of migratory birds across the southwestern United States and northern Mexico, several news outlets reported. From flycatchers to swallows to warblers, researchers estimate hundreds of thousands to possibly up to a million birds have died in recent weeks

3-4

step-by-step explanation:

the answer is 3-4 because both 45 and 60 has a multiple of 15.

45/3=15

60/4=15

therefore the odds against selecting a red is 4-3

its totaly b

your welcome btw