PLEASE ANSWER NO LINKS OR GET REPORTED : Two-hundred pounds of bio-degradable material was weighed every two years to determine how much time it would take for the material to degrade. Which equation represents y, the total amount of weight at the end of t years?​

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?

The difference between tax advoidance and tax evasion

The graph of y = ax^2 + bx + c is a parabola that opens up and has a vertex at (0, 5). what is the solution set of the related equation 0 = ax%2 + bx + c?