15. charlie saves $2 for every $9 he earns. melody saves $4 for
every $12 she earns. is charlie's ratio of money saved to money
earned equivalent to melody's ratio of money saved to money
earned? explain.

1. there are 25 students who started computer programming in elementary school and 25 students who started computer programming in middle school. the first group had a mean final project grade of 95% and the second group had a mean final project grade of 92%. the line plot shows the differences after 10 rerandomizations. determine whether the difference in the means of the two groups is significant based on the line plot. explain your answer.

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is . reset next

In 3 years, dianna will be 4 times as old as she was 33 years ago. how old is dianna now? translate the phrase "in 3 years" into algebraic terms.