Final answer:
The expressions b) 10x - 50 = 0 and c) 3x + 20 = 50 are the ones where, if x equals 10, the expressions would equal 50.
Step-by-step explanation:
When x = 10, we need to evaluate which of the given expressions could equal 50. Here is the evaluation for each of the given expressions: 6x + 5 = 6(10) + 5 = 60 + 5 = 65, which does not equal 50. 10x - 50 = 10(10) - 50 = 100 - 50 = 50, which does equal 50. 3x + 20 = 3(10) + 20 = 30 + 20 = 50, which does equal 50. For the expression 5x + 25 = 100, let's first solve for x: 5x + 25 = 100, 5x = 100 - 25, 5x = 75, x = 75/5, x = 15. This states that when x = 15 (not 10), the expression equals 100, so with x = 10 it does not equal 50.