1. Calculate 78 + 15.
Suggested workflow: Enter the expression on the home screen and press ENTER.
Show hint
Check the plus sign and press ENTER.
Show worked answer
78 + 15 = 93.
Guided TI-84 practice
Do the task. Check it. Learn from the result.
Work one set at a time. Use the calculator, reveal a hint only when you need it, and open the worked answer after you have made an attempt.
Set 1
3 questionsCalculator basics
2. Calculate (−3)².
Suggested workflow: Use the negative key for −3, wrap it in parentheses, then press x².
Show hint
The parentheses matter: (−3)² is positive.
Show worked answer
(−3)² = 9.
3. Calculate √144.
Suggested workflow: Use 2nd, x² to open the square-root template.
Show hint
Make sure 144 is inside the radical.
Show worked answer
√144 = 12.
Set 2
3 questionsGraphing and tables
4. For y = x² − 4, enter the positive x-intercept.
Suggested workflow: Graph the function and use 2nd, TRACE, zero.
Show hint
The graph crosses at −2 and 2; enter the positive value.
Show worked answer
The positive x-intercept is 2.
5. For y = 2x + 1, what is y when x = 3?
Suggested workflow: Graph the function and TRACE to x = 3, or use the table.
Show hint
Substitute x = 3 or read the table.
Show worked answer
2(3) + 1 = 7.
6. What is the vertex y-value of y = x² − 4?
Suggested workflow: Graph the parabola and use minimum from the CALC menu.
Show hint
The lowest point occurs at x = 0.
Show worked answer
The vertex is (0, −4), so the y-value is −4.
Set 3
3 questionsStatistics and lists
7. Find the mean of 4, 6, 6, 8 and 11.
Suggested workflow: Enter the data in L1 and run 1-Var Stats.
Show hint
Look for x̄ in the results.
Show worked answer
The sum is 35 and 35 ÷ 5 = 7.
8. Find the median of 4, 6, 6, 8 and 11.
Suggested workflow: Run 1-Var Stats and read Med.
Show hint
The middle value in the ordered list is the median.
Show worked answer
The median is 6.
9. Find the range of 4, 6, 6, 8 and 11.
Suggested workflow: Use the minimum and maximum from the statistics results.
Show hint
Subtract the minimum from the maximum.
Show worked answer
11 − 4 = 7.
Set 4
3 questionsMatrices
10. Find det([[2,1],[3,4]]).
Suggested workflow: Create matrix [A], then use det([A]).
Show hint
For a 2×2 matrix, det = ad − bc.
Show worked answer
2×4 − 1×3 = 5.
11. Add [[1,2],[3,4]] and [[5,6],[7,8]]. Enter the top-left value.
Suggested workflow: Store the matrices as [A] and [B], then calculate [A]+[B].
Show hint
Add corresponding entries.
Show worked answer
1 + 5 = 6.
12. Multiply [[1,0],[0,1]] by [[5,6],[7,8]]. Enter the bottom-right value.
Suggested workflow: The first matrix is the identity matrix.
Show hint
Multiplying by the identity leaves the matrix unchanged.
Show worked answer
The product is [[5,6],[7,8]], so the bottom-right value is 8.
Set 5
3 questionsTrigonometry
13. In Degree mode, calculate sin(30).
Suggested workflow: Set MODE to Degree, then enter sin(30).
Show hint
If the answer is not 0.5, check the angle mode.
Show worked answer
sin(30°) = 0.5.
14. In Degree mode, calculate cos(60).
Suggested workflow: Set MODE to Degree, then enter cos(60).
Show hint
Cosine of 60 degrees is a common exact value.
Show worked answer
cos(60°) = 0.5.
15. In Degree mode, calculate tan(45).
Suggested workflow: Set MODE to Degree, then enter tan(45).
Show hint
Check that the calculator is not in Radian mode.
Show worked answer
tan(45°) = 1.