Look at the number line, 0 going to the left is neg going to the right is positive. Look at 1 on the left, go to the other side and look at the 1 again but with a - in front of it. The next one is -2. The one next to -2 is -3 and -4 is next to it. I hope this will help you out.
Answer:
从 1 到 20 有 8 个素数。它们列在下面：2、3、5、7、11、13、17 和 19。
Answer:
B & D
Step-by-step explanation:
The quadratic formula can be used to solve for x for any quadratic. Recall a quadratic is any function whose highest exponent known as degree is 2. Looking at the answer selections, A has one term with exponent 3. This isn't possible in the formula. Looking at answer C, the term with exponent 2 has the same coefficient on each side of the equal sign. When it is rearranged these will cancel out no exponent of 2 will be in the equation anymore. Only B & D work after being rearranged and simplified
