Answer:
82 phone calls
Step-by-step explanation:
If she had already spent 9 minutes, and she expects to spend 1 minute on each phone call; and she wants to spend 91 minutes on her phone;
91 - 9 = 82
(x,y)=(4,5)
c = 3x-y = 3(4) - 5 = 7
Answer: 7
2164 dollars
Answer: [-11,4]
yes in brackets
Answer: 7⁴, 7 to the fourth power, 7x7x7x7
