Katrina is asked to simplify the expression-3a-4b-2(5a-7b). She writes -3a-4b-2(5a-7b)=3a-4b-10a+14b
Which property allows her to do this?

41/2 - 1 1/3 what is the answer as a fraction?

What are the relative frequencies, to the nearest hundredth, of the rows of the two-way table? group 1: a 15 b 45 group 2: a 20 b 25

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?