The librarian was checking the thicknesses of several books and found that the average thickness of a book was 1.8 centimeters. She found this by averaging the thicknesses of five different books. Four of the thicknesses were 1.4 cm, 1.9 cm,
2.1 cm, and 2.4 cm. What was the thickness of the fifth book that she measured?

In triangle opq right angled at p op=7cm, oq-pq=1 determine the values of sinq and cosq

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Acaterer charges $500 plus $30 per guest to cater a wedding. walt and traci don't want to spend more than $8000 on catering. write and solve an inequality in terms of the number of guests, g, that can be invited. a) 30g ? 8000; g ? 267 b) 500g < 8000; g < 16 c) 500 + 30g < 8000; g < 250 d) 500 + 30g ? 8000; g ? 250