The domain of a function is always equal to which one of the following options?

If a =6, what is the value of 2a(3b + 5c)?

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

Solve the triangle. a = 21°, c = 105°, c = 5