# jeffdanielk

### Is there any branch of math where a set can have a negative number of members?

How could you define or use a set with less members than the empty set?

1 AnswerMathematics3 weeks ago### How do you solve a system of 2 quadratic equations in 2 variables? ?

For example:

x^2 + y^2 + 2x + 3y + 4xy - 47 = 0

2x^2 + 3y^2 + x + 5y + 2xy - 79 = 0

I want to know the procedure, not just the answer.

A summary of steps would be great. I don't need every bit of the algebra.

3 AnswersMathematics7 months ago### In the Bible, at the beginning of chapter Ezekiel, he describes a helicopter or aircraft that landed by him. Who built this craft? ?

Did anyone on Earth have that kind of technology thousands of years ago?

God or angels wouldn't need a craft with wheels, rotating blades, and engines.

9 AnswersReligion & Spirituality8 months ago### In blackjack, an ace can be either 1 or 11. If the dealer has 13 and draws an ace, could he make it 11, giving him 24, and going over?

If he did this in order to let all the players win, it wouldn't be cheating or against the rules of blackjack, would it?

6 AnswersGambling8 months ago### Is the speed of light greater than C in the space between the plates in the Casimir Effect? ?

The energy is negative between the plates. The density is less than empty free space. So does this make its index of refraction less than 1? If so, would light travel faster than C there?

V = C/n

1 AnswerPhysics8 months ago### In geometry, is this figure considered a closed curve? The graph of Y = 1 / X^2 and the X axis. ?

This figure is a curved triangle with its sides meeting at infinity.

Is it classified as a closed curve?

2 AnswersMathematics9 months ago### What is the NHL record for most rounds in a shootout at the end of a tie game? ?

What happens if the teams run out of players to take shots? Can a player shoot twice?

2 AnswersHockey9 months ago### When do quadratic equations come up in normal everyday life? ?

Why do students need to know how to solve quadratic equations?

What is an example of their use in common everyday life situations?

4 AnswersMathematics9 months ago### Theoretically, how could a wormhole be created?

Concentrating alot of matter or energy in one place creates a black hole. But what would make a wormhole?

A wormhole changes the topology of spacetime. General Relativity allows geometry to change, but does it allow a change of topology?

2 AnswersPhysics9 months ago### In NFL playoff games, what is the rule for the 2nd OT period if neither team scores in the first OT period? ?

Does play continue where it left off in 1st OT or is there another kickoff?

Do they flip a coin again?Does a field goal win the game in 2nd OT or does other team get a chance to possess the ball?

5 AnswersFootball (American)9 months ago### Can two NFL teams agree to call their game a tie? ?

If two teams can both make the playoffs with a tie on their last game but would be eliminated with a loss, can they agree to make their game a tie? Would they cancel that game? Would they agree to just stand on the field but not try to score? Is there any rule against this?

7 AnswersFootball (American)9 months ago### Is there a word for the magnitude of acceleration? ?

Speed is the magnitude of the velocity vector. Is there a term for the magnitude of the acceleration vector?

7 AnswersPhysics10 months ago### According to religion, what happens to a person if he dies after eternity has already passed for the universe?

If a person falls into a black hole, he crosses the event horizon after an infinite amount of time passes for the outside universe. But only a short time passes for the infalling astronaut. He will die later when he hits the singularity at the center.

How can he go to heaven if eternity has already passed? Do his friends in heaven wait forever and never see him again? Does Christianity have any opinion on this?

12 AnswersReligion & Spirituality10 months ago### What is the radius of the biggest circle that will touch the bottom of a sin wave y = sin x ? ?

Imagine a big circle rolling across the top of a sin wave. A little circle will roll to the lowest spot in the sin wave. What is the biggest circle that fits inside y=sin(x) and touches the point (3π/2, -1) ?

1 AnswerMathematics10 months ago### If my parents never met but both had kids with other spouces, would I have same mom and different dad or same dad and different mom?

Would my same consciousness exist but in a different body? Or would my current consciousness never have existed?

5 AnswersBiology10 months ago