An expression is shown below:

3(m + 5 + 9m)

Part A: Write two expressions that are equivalent to the given expression. (3 points)

Part B: Show that one of your expressions in Part A is equivalent to the given expression using algebraic properties. Explain which properties you used. (4 points)

Part C: Show that your other expression from Part A is equivalent to the given expression by substituting a number for m. (3 points)

A: two expressions equivalent to 3(m + 5 + 9m) are 3(5 + 10m) and (3m + 15 + 27m)

B: 3(m + 5 + 9m) = 3(5 +  m + 9m) = 3(5 + 10m)    [associative property]

3(m + 5 + 9m) = (3m + 15 + 27m)    [distributive]

C: Let m = 2: 3(m + 5 + 9m) = 3(2 + 5 + 9(2)) = 3(7 + 18) = 3(25) = 75

3(5 + 10m) = 3(5 + 10(2)) = 3(5 + 20) = 3(25) = 75

3m + 15 + 27m = 3(2) + 15 + 27(2) = 6 + 15 + 54 = 75

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: