Isabel reads 9 3/4 chapters in 4 1/2 hours. What is the unit rate in chapters per hour?

Write your answer as a fraction or a mixed number in simplest form.

PLEASE HELP!!! NO LINKS PLEASE

hep the ratio of the weight of shawn's dog to the weight of andy's dog is 5: 7 shawn's cat weight 23kg approimately how much does andy's dog weigh

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a