three equal negative point charges are placed at three of the corners of a square of side d. what is the magnitude of the net electric field at the center of the square? (k=1/4πϵ0=8.99×109n⋅m2/c2 )

Panthers and leopards prey on deer in an ecosystem. for unknown reasons, the population of leopards increased drastically. what are the likely effects of this change on the species? 1. more food for panthers and more competition for leopards 2. less food and more competition for panthers 3. fewer deer and more competition for panthers 4. more food for deer and less competition for panthers and leopards 5. more food for leopards and less competition for panthers

How do you work out 21.3-8= show your working. plz

Igot a 80% on my final to os ya take these points in return