Alyssa’s family went to the movies with Andrea’s family. They each bought their own tickets. Alyssa bought 1 adult and 2 child tickets for $16. Andrea spent $28 on 2 adult tickets and 3 child tickets. Which system of equations best represents the situation where a is adult and c is child?

One-third of the people from country a claim that they are from country b, and the rest admit they are from country a. one-fourth of the people from country claim that they are from country a, and the rest admit they are from country b. in a combined census of the two countries, one-half of the total claimed to be from a. what is the ratio of the populations of country a to that of country b.

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

True or false look at the picture pls : /