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Are These Expressions Equivalent?

Check yes or no: are the two expressions equivalent, equal for EVERY value of the variable, not just one? Then explain and test a value.

ExampleAre these two expressions equivalent? Test a value to check.
n + n + n  and  n3
yesno
Why: n + n + n = 3n, which is not n3 = n × n × n. Adding repeatedly gives a coefficient; multiplying repeatedly gives an exponent. Test n = 2: 6 against 8.
  1. 1.Are these two expressions equivalent? Test a value to check.
    2n + 4n + 9  and  6n + 10
    yesno
    Why?
  2. 2.Are these two expressions equivalent? Test a value to check.
    3(a + 6)  and  3a + 6
    yesno
    Why?
  3. 3.Are these two expressions equivalent? Test a value to check.
    8(m + 3)  and  8m + 3
    yesno
    Why?
  4. 4.Are these two expressions equivalent? Test a value to check.
    5n + 6n + 6  and  11n + 6
    yesno
    Why?
  5. 5.Are these two expressions equivalent? Test a value to check.
    7t + 5t + 2  and  12t + 2
    yesno
    Why?