Select all actions you should take to check for mistakes in your formulas. Check that you entered the correct data.
Look to see that you used the correct cell names.
Recalculate everything using a calculator.
Run a formula checker.
Make sure you have followed the correct order of operations.
Check that you used the correct operations.
Estimate the answer and compare to the actual answer.

add the following

professionals can use many types of technology that can them. some examples are, computers (they research and can use for programs for data, they are also used for job applications, school work, and even to make new ideas), speedometers (can get data for unknown data), sometimes something as small as a pen (used for rough drafts, to insert data, and again job applications).

answer; availability;