we use a TI-82 to find the equation: 1)Press STAT, 1. Enter the X values in L1 and Y values in L2 . It seems that we can draw a quadratic curve through all 5 points. So, we will find a quadratic relation between Y and X. we do so using a TI-82 STAT feature. The correct answer is J since a = -1 and c = 4. 2) Press 2nd STAT PLOT,1, Enter, ZOOM, 9. The value of b is very close to zero. It should be zero. The reason that it is not zero is rounding done by the calculator in the process of calculations. 3) Press STAT, right arrow, 6, Enter. OBJECTIVE 2

2) Press 2nd STAT PLOT,1, Enter, ZOOM, 9. we use a TI-82 to find the amount of radioactive material at time 50 hours: 1)Press STAT, 1. Enter the Time values in L1 and the Mass values in L2 . 2) Press 2nd STAT PLOT,1, Enter, ZOOM, 9. It seems that we can draw an exponential decay curve through all 4 points. So, we will find an exponential relation between Mass and Time. we do so using a TI-82 STAT feature. 4) Press Y= , VARS, 5, right arrow twice, 7. 5) Press 2nd TblSet and set Indpnt to Ask. Then press 2nd TABLE and enter 50 for X. Notice the answer 2.25. To check your equation, enter 0,10,20, and 30 for X. The values for Y1 should be the same as given in the table above. 3) Press STAT, right arrow, arrow down to ExpReg, Enter, Enter.

CREATED BY R.KHADEM / Adapted by Rene Sandel-Patterson End-of-Course Test Algebra I THIS IS THE END OF OBJECTIVE 1 REVIEW. YOU NEED TO WORK OUT THE PROBLEMS RELATED TO THIS OBJECTIVE. YOUR TEACHER WILL PROVIDE YOU WITH THE WORKSHEETS. WE WILL COVER OBJECTIVE 2 NEXT. CREATED BY R.KHADEM / Adapted by Rene Sandel-Patterson