What is the distance on the number line from -10 to 7​

Y+ 2/y is it a polynomial in one variable or not? and if so, why?

How many four digit even numbers can be formed from digits 1,2,3,4,5 if repetition is allowed. how can solve this using permutation formula

Atown has a population of 7000 and grows at 3% every year. to the nearest year, how long will it be until the population will reach 12400?