Tina, David and Ahmed share gold coins in the ratio of 2:4:4. David gets 80 more gold coins than Tina. How many gold coins did Ahmed get?

Given the choice between receiving $1.000.000 in one month or a single penny-doubled everyday for the period of one month; which option would you choice? show your work to support your answer. (assume that 1 month=30 days)

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

The bottom of ignacio's desktop is 74.5cm from the floor. ignacios sits in his adjustable chair, and the tops of his legs are 49.3cm from the floor. each clockwise rotation of the knob on the chair raises ignacio's legs by 4.8cm. write an inequality to determine the number of clockwise rotations, r, ignacio could make with the knob without his legs touching the desk.