I doing it right know i will give you the answer
Answer:
Step-by-step explanation:
<h3><u>Given expression:</u></h3>
= 
![= 3x(3x^2+3x+8)-1(3x^2+3x+8)\\\\Multiply\\\\=9x^3+9x^2+24x-3x^2-3x-8\\\\Combine \ like \ terms\\\\= 9x^3+9x^2-3x^2+24x-3x-8\\\\= 9x^3+6x^2+21x-8\\\\\rule[225]{225}{2}](https://tex.z-dn.net/?f=%3D%203x%283x%5E2%2B3x%2B8%29-1%283x%5E2%2B3x%2B8%29%5C%5C%5C%5CMultiply%5C%5C%5C%5C%3D9x%5E3%2B9x%5E2%2B24x-3x%5E2-3x-8%5C%5C%5C%5CCombine%20%5C%20like%20%5C%20terms%5C%5C%5C%5C%3D%209x%5E3%2B9x%5E2-3x%5E2%2B24x-3x-8%5C%5C%5C%5C%3D%209x%5E3%2B6x%5E2%2B21x-8%5C%5C%5C%5C%5Crule%5B225%5D%7B225%7D%7B2%7D)
Answer:
Step-by-step explanation:
Answer:
399 minutes a month
Step-by-step explanation:
As I understand the question the answer would, in other words, be how many minutes you can long-distance call with the economy plan for under $30.
The unit ratio is 5 cents per minute, which equates to 20 minutes worth of call time for one dollar (100/5).
The economy plan is $20 cheaper than the deluxe plan. $20 spent on long-distance calling gets you 400 mintues, but the question asks for an integer that would still leave remaining money.
Therefore the answer is 399 minutes of long-distance calling, which would leave five unspent cents.
Rational. Not whole or integer because its an exact measurement and not irrational because it CAN be expressed as a ratio (fraction, decimal measurement )
