Sin(90 + α) = Cos α But cos is negative in Q2. (90 + α) is going to Q2. So why Cos α is not negative in that equation?

Astandard american eskimo dog has a mean weight of 30 pounds with a standard deviation of 2 pounds. assuming the weights of standard eskimo dogs are normally distributed, what range of weights would 99.7% of the dogs have? approximately 26–34 pounds approximately 24–36 pounds approximately 28–32 pounds approximately 29–31 pounds

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

If there is 20 dogs in the shelter and 5 dogs get homes, and then 43 more dogs come. how many dogs are there in the shelter?