If the average (arithmetic mean) of 2, 7, and x is 12, what is the value of x?

5x + 2 = 12 solve the following equation. then place the correct number in the box provided.

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5

Factor the expression using the gcf. the expression 21m−49n factored using the gcf