Help Asap! I have 30 minutes! 30 Points!

2 answers:

6 0

(2x - 5) (5x - 10)
Use FOIL
10x² - 20x - 25x + 50

10x² - 45x + 50

5( 2x² - 9x + 10)

2x -5
x -2

5(2x - 5)(x -2)

make each equal to 0
2x - 5 = 0
x - 2 = 0

2x - 5 = 0 x - 2 = 0
2x - 5 (+5) = 0 x - 2 (+2) = 0 (+2)
2x = 5 x = 2
x = 5/2

x = 5/2 , 2

hope this helps

Damm [24]3 years ago

5 0

<span>Help Asap! I have 30 minutes! 30 Points!
What is the value of x? (2x - 5) (5x - 10)
(No answers, you have to write the answers)</span>

$(2x-5)(5x-10)= 0 \\ \\ the\ distributive\ property. \\ \\ 10x^2-20x-25x+50 = 0 \\ \\ 10x^2-45x +50 = 0 \\ \\ Bhaskara \to \ x _{1\ and\ 2} = \dfrac{-b\pm \sqrt{b^2-4ac} }{2a} \quad a=10\quad b= -45\quad c=50 \\ \\ \\ \ x _{1\ and\ 2} = \dfrac{-(-45)\pm \sqrt{(45)^2-4(10)(50)} }{2(10)} \\ \\ \\\ x _{1\ and\ 2} = \dfrac{+45\pm \sqrt{2025-2000} }{20} \\ \\ \\\ x _{1\ and\ 2} = \dfrac{+45\pm \sqrt{25} }{20}$

$x _{1\ and\ 2} = \dfrac{+45\pm 5 }{20} \\ \\ \\ x _{1} = \dfrac{+45+ 5 }{20} \qquad\qquad x _{2} = \dfrac{+45-5 }{20}\\ \\ \\ x _{1} = \dfrac{50 }{20} \qquad\qquad \qquad x _{2} = \dfrac{+40 }{20}\\ \\ \\ x _{1} = \dfrac{5 }{2} \qquad\qquad \qquad x _{2} = \dfrac{+4 }{2} \\ \\ \\ \boxed{\\ \\ \\ x _{1} = \dfrac{5 }{2} \qquad\qquad \qquad x _{2} = 2}$

I wish you much success in your studies!!!!

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In 2013, a study found that U.S. consumers consumed soft drinks with a mean of 42.2 gallons per year and variance of 169. Ninety

melisa1 [442]

Answer:

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The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

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The standard deviation is the square root of the variance, so $\sigma = \sqrt{169} = 13$