Answer:
it's 6
Step-by-step explanation:
B=7 and D=13, so 13-7= 6

<em>If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up (+1).</em>
<em>If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down (no change).</em>
Answer:
First one is x(7-4)
Second one is x(3)
Third one is 3x
Step-by-step explanation: Plz mark brainliest