Claudia is interested in knowing which figure skater competing in the Olympic Games is most favored to win a gold medal. To sample the students in her school, she prepares a list of all of the boys and girls in the school and randomly chooses a sample from each group so that the size of each group is proportional to the number of boys and girls in the school. Which sampling method did Claudia use? A. simple random sampling
B. stratified random sampling
C. systematic random sampling
D. simple non-random sampling

And employee salary increased by $4500 which represents a 15% raise what is the rate of the increase

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

22. catie is starting a babysitting business. she spent $26 to make signs to advertise. she charges an initial fee of $5 and then $3 for each hour of service. write and solve an inequality to find the number of hours she will have to babysit to make a profit. interpret the solution.!