Use the distributive property to simplify the expression. (10 + 4 y) 1/2

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?

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?