X^2 + 6x - 7 =
(x + 7)(x - 1)
Answer:
The exact same as subtracting.
Example
5 + (-2) = 3
Answer: 3h + 0.9s
Step-by-step explanation:
90% is the same as 0.9 of..
1. She could get 9 envelopes for 4 dollars each (or the other way around)
2. She could get 12 envelopes for 3 dollars each (or the other way around)
3. She could get 18 envelopes for 2 dollars each (or the other way around)