Hello :
This number is : x
you have : x + 2x² = 6
2x² + x -6 = 0
Δ = b² -4ac a = 2 , b = 1 , c = 6
Δ = 1² - 4(2)(6) = 49 = 7²
X1 = (- 1 +7)/4 = 3/2
X2 = (-1-7)/4 = -2
Answer:
x=-11
Step-by-step explanation:
Answer:
5 $20 bills and 7 $10 bills
Step-by-step explanation:
You need to have 12 bills, and their values must add up to $170. Start with a guess, and adjust the guess until you find the answer.
The total number of $20 bills and $10 bills must be 10.
I made a table below. I started with a guess and kept adjusting it.
Number of Number of Total
$20 bills $10 bills Value
8 ($160) 4 ($40) $200 Value is too high.
6 ($120) 6 ($60) $180 Value is close
5 ($100) 7 ($70) $70 Correct value
Answer: 5 $20 bills and 7 $10 bills
Answer:
-2x
Step-by-step explanation:
1) Simplify brackets
-1/3+4/9
2) Find the Least Common Denominator (LCD) of 1/3, 4/9
LCD = 9
3) Make the denominators the same as the LCD
-((1 times 3)/(3 times 3)) + 4/9
4) Simplify. Denominators are now the same
-3/9 +4/9
5) Join the denominators
(-3+4)/9
6) Simplify
1/9
<u>Your answer is C) 1/9</u>