Plz math

what is 8.49×10−78.49×10−7 in decimal form?

a. 0.849

b. 0.849

c. 8,490,000

d. 849,000,000

What is the value of the expression below? (81^2)^1/8

Select the correct answer. joshua likes to read. he read 6 books when he was 6 years old. every year he doubled the number of books he read the previous year. how many total books did he read between the ages of 6 and 10? a. 60 b. 90 c.186 d.187

Igor stravinsky tires sells approximately 3,760,000 car tires and 1,200,000 truck tires each year. about 47,000,000 care tires and 26,000,00 truck tires are sold each year in the united states. what is stravinsky's market share in each of these two markets (cars and trucks)?