Amy created the following residual plot: does her residual plot make sense based on the scatterplot

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?

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

What is the relationship between all triangles that can be drawn given the same three angles