- Um número => x
- O quadrado de um número => x²
<span>- O produto desse número por 3, mais 18 => 3x + 18
x</span>² = 3x + 18 => x² - 3x - 18 = 0, p/ a = 1, b = -3, c = -18
Δ = (-3)² - 4(1)(-18) = 81
<span>x' = [-(-3) + 9]/2 = 12/2 = 6
x" = </span><span> [-(-3) - 9]/2 = -6/2 = -3</span>
Answer: The best deal is 1/2 a pizza for $8.
Step-by-step explanation:
-First you take all of the fractions, find the greatest common denomenator and make all of the denomenators the same
- I found that all the denomenators went into 30 so I multiplied them by what they needed to be 30
1/5 x 6 = 6/30 2/5 x 6 = 12/30 1/2 x 15 = 15/30 2/3 x 10 = 10/30
-By doing this you can see you get the most slices for $8
GCF = 4
Reduce the fraction by dividing
the numerator and denominator by 4
and get the simplified answer.
<span><span>12 ÷ 4
--------- = 3/8
32 ÷ 4
Your answer is 3/8. :D</span></span>
Answer:
(a) = 40%
(b) = 28%
(c) Expected value = $222,500
Standard deviation = $7,216.88
Step-by-step explanation:
This is a normal distribution with a = 210,000 and b =235,000
(a) The probability that he will get at least $225,000 for the house is:
(b)The probability he will get less than $217,000 is:
(c) The expected value (E) and the standard deviation (S) are: