A company surveys every tenth person in the phone book. What type of sampling did the company use?

A. biased sample

B. self-selected sample

C. stratified sample

D. systematic sample

Of 60 books on a bookshelf, 24 are nonfiction. What percent of the books are nonfiction?

How do u find the absolute value

Cos (a-b) = cos a cos b + sin a sin b for all values of a and b. True or False

Look at these sets of ordered pairs. W) { (8, 9), (2, 3), (0, - 2), (10,-9) } X) { (0, 0), (5, 10), (-3, 3}} Y) { (1, 1), (2, 2), (3, 3), (4,4) } z) { (-10, 1), (-9, 3), (-4,5) } Which of the sets represent functions?

The "off-peak" weekly average cost of hiring a caravan in Wales is 520. In July the average cost increases to 800. calculate the percentage increase in cost. Give your answer to 2 significant figures.

How many times smaller is 6 is than 60

Sarah is making strings of beads in the first string she uses 3 beads and she triples the number of beads in each of the next strings identify the number of beads she uses in 5 string

If yuri has 20 books in each shelve and there are 6 bookshelves how many book are in the bookcase

Write an equation to solve Keisha bought a used bike for $12 more than half its original price. She paid $72. What was the original price?

Round 45,122 to the nearest thousand