I will give brainliest please help me asap! Simplify the expression. Make sure you have all positive exponents.​

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a. about 4 b. about 8 c. about 40 d. about 21

Maria walks a round trip of 0.75 mile to school every day. how many miles will she walk in 4.5 days

The triangles in the diagram are congruent. if mzf = 40°, mza = 80°, and mzg = 60°, what is mzb?