Solve each equation by using square roots 3x^2-15=0

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

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

21 type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. the solution set of n2 - 14n = -45 is { (separate the solutions with a comma)