7. Tina rides her electric bicycle 10 km/h faster than Tony. Tina can travel 60 km in the same time that is takes Tony to travel 40 km. Determine Tina's average speed and Tony's average speed.
State the variable used and what it represents. Show all WORK.

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

Graph the system of inequalities presented here on your own paper, then use your graph to answer the following questions: y < 4x − 8 y is greater than or equal to negative 5 over 2 times x plus 5 part a: describe the graph of the system, including shading and the types of lines graphed. provide a description of the solution area. (6 points) part b: is the point (5, −8) included in the solution area for the system? justify your answer mathematically. (4 points)