In a class of 30 students, 5 have a cat and 18 have a dog. There are 10 students who do not have a cat or a dog. What is the probability that a student chosen randomly from the class has a cat or a dog?​

Which system of linear inequalities is represented by the graph?

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items