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2 years ago

15

Last year's computer models are discounted 20%. What was the original price to the nearest dollar of a computer that now costs $

1,480?

1 answer:

Alisiya [41]2 years ago

3 0

Answer:

<h3>$1850</h3>

Step-by-step explanation:

<h3>If the Original price was $ X , Then </h3>

$x - 0.20x \: = 1480$

$0.8x = 1480$

$x = 1480 \div 0.8$

<h3>So , X = 1850 dollars .</h3>

<h2>Hope this helps you !!! </h2>

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Answer:

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At most two means at x = 0 ,1 , 2

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c. That at least 13 of them have been married?

P(x=13)+P(x=14)+P(x=15)

$={15}C_{13}(0.75)^{13} (0.25^{15-13})+{15}C_{14} (0.75)^{14}(0.25^{15-14}+{15}C_{15} (0.75)^{15} (0.25^{15-15})$

$=\frac{15!}{13!(15-13)!}(0.75)^{13} (0.25^{15-13})+\frac{15!}{14!(15-14)!} (0.75)^{14}(0.25^{15-14}+{15}C_{15} (0.75)^{15} (0.25^{15-15})$

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