The estimated attendance for Live 8, a worldwide free concert held in July 2005, was 1.8 million people, including figures near 800,000 in Philadelphia, 300,000 in Paris, and 200,000 in Rome and Berlin.  Do concert officials really count all those in attendance?  How do you suppose these figures are produced? How accurate can these estimates be?​

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two

Klmn and pqrs are similar trapezoids. which side of pqrs corresponds to lm

Grace is standing 18 feet from a lighthouse and kelly is standing 10 feet from grace. the angle that grace looks up to see the top of the lighthouse is 45°. the angle that kelly looks up to see the top of the lighthouse is y°. find the height, h, of the lighthouse. find the angle, rounded to the nearest tenth of a degree, in which kelly looks up to the top of the lighthouse. to the nearest tenth of a degree, find the value of x° . in two or more sentences, explain your calculations