What is the answers to the following questions?

286, 174 + 30,976

286,174 + 35,252 + 30,796 ( write the estimate next to your answer)

the digit 5 occurs 2 times in 35,252. what's the value of each 5? explain your answer.

alaska's glacier bay national park had 418,911 visitors in 2008. then, the park had 444,653 visitors in 2009. how many people visited the park in 2008 and 2009

a. 852,564. c. 863,564

b. 862,564. d. 963,564

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