Explain why that’s my answer

An animal shelter has 21 puppies. if the puppies are 28% of the total dog and cat population , how many dogs and cats are in the animal shelter

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9