1. Which of the following are equivalent to -7 ? $\frac{-49}{-7}$ $\frac{0}{-7}$ $\frac{49}{-7}$ $\frac{-21}{3}$ $\frac{21}{3}$

Step 1 ：The question is asking for the equivalent of -7. To find the equivalent, we need to perform the operations given in each option and check if the result is -7.

Step 2 ：Perform the operations for each option: \(\frac{-49}{-7}\), \(\frac{0}{-7}\), \(\frac{49}{-7}\), \(\frac{-21}{3}\), \(\frac{21}{3}\).

Step 3 ：The options that result in -7 are \(\frac{49}{-7}\) and \(\frac{-21}{3}\).

Step 4 ：\(\boxed{\text{The options equivalent to -7 are } \frac{49}{-7} \text{ and } \frac{-21}{3}}\)