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

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?

When a rectangle is dilated, how do the perimeter and area of the rectangle change?