The answer would be D since x alone cannot form an expression. It can however be a term, variable, and a constant, because those all need another number to form a formal question.
A
Because A dictates the actual equation correctly
For this one I'm going to assume that 4 7a means 4 * 7a...
(8 + 7a) + 4 * 7a =
8 + 7a + 28a =
8 + 35a
If I read it wrong and 4 7a is actually 47a then...
(8 + 7a) + 47a =
8 + 54a =
2(4 + 27a)
4. 15 tens, 1 hundred, 5 tens
150
5. 18 tens, 1 hundred, 8 tens
180
note: I hope this helps. I haven't done this in a long time. Sorry X(
The answer is 63. 9 times 7 is 63
