Answer:

Step-by-step explanation:

Answer:
1 Spanish 90%
2.French 37%
3. Chinese 18%
Step-by-step explanation:
9/10 .......... 90/100 ........... 90%
37%.................. 37%
9/50............. 18/100 .......... 18%
-1/2 = -3/6
-3/6 + 1/6 = -2/6
-2/6 = -1/3
-1/3 is your answer
hope this helps
Answer:
I'm not very sure, however I think you have to replace the sign - for a +.
Step-by-step explanation:
7 + 4√13