Answer:
-4a + 7a = + 3a
But you don't actually need a pkus sign 3a is fine too. You are basically sum - 4 and 7. Let me know if you still confused.
Answer:
The answer is 10y + 48.
Step-by-step explanation:
First you have to get rid of brackets by expanding :

Next you have to collect like-terms :

Answer:
it depends
Step-by-step explanation:
it really just depends
Answer:
a=7b=9c=4
Step-by-step explanation:
Answer:
no because there is no relation between the temperature changes
Step-by-step explanation: