(-1,-1)
I recommend photomath, it helps with all equations!
Answer:
- a=4
- b=12
- c=9
- You have correctly selected the standard form.
Step-by-step explanation:
(2x +3)² = (2x)² + 2(2x)(3) +(3)²
= 4x² +12x +9
Comparing that to ax² +bx +c, we can identify ...
1 quarter + 1 dime + 1 nickel = 25¢ + 10¢ + 5¢ = 40¢
Each 5<span>¢ buys 15 minutes. How many ' 5</span>¢ ' are in 40<span>¢</span> ?
40/5 = 8 of them. So the (quarter+dime+nickel) can buy 8 x 15 minutes = 2 hours.
Starting at 9:00 AM, the meter had 5 minutes left on it, and Marsha bought
another 2 hours. So now the meter is good until 2 hours and 5 minutes
after 9:00 AM . . . . . 11:05 AM.