Alana and petra go to a used book sale, where every book is the same price. alana buys 5 books and petra buys 4 books. they run into their friend angus, who really loves to read, and discover that he has bought 19 books. angus received a $10 discount, but he still spent $5 more than alana and petra combined. how much does one book cost?

The two-way table shows the number of people whose hobbies are reading or solving puzzles and who either ride a motorcycle or don’t ride a motorcycle. among people whose hobby is reading, what is the relative frequency of not riding a motorcycle? express your answer as a decimal, and round it to the nearest hundredth if necessary. enter your answer in the box. reading solving puzzles ride a motorcycle 7 3 don't ride a motorcycle 5 9

The highest common factor of 132 and 220

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?