The length of a rectangle or field is 25 yards this is 3 yards more than twice the width how wide is the field

Evaluate the dot product of (3,-1) and (1,5)

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?

What is the slope of the line shown below?