Hey uh guys i need help pls thanks

Mathematics

1 answer:

vivado [14]3 years ago

7 0

i don’t know for sure but i just figured it out....

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Simplify the expression 2 • (3 + 5 − 1) • 2

s2008m [1.1K]

I think the simplify expression is 2^2 x 7 = 28. Sorry if it is wrong

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Find the inverse of f(x)=2x+7

alukav5142 [94]

F ^-1(x) = x+7/2 should be your solution I really hope this helps and im so sorry if it doesn’t!!

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2 years ago

Sixty percent of the eligible voting residents of a certain community support the incumbent candidate. If eight of the residents

il63 [147K]

By the binomial theorem we know that

$1 = (.4 + .6)^8 \\ = {8 \choose 0} (.4)^{8} (.6)^{0} + {8 \choose 1} (.4)^{7} (.6)^{1} +{8 \choose 2} (.4)^{6} (.6)^{2} + {8 \choose 3} (.4)^{5} (.6)^{3} + {8 \choose 4} (.4)^{4} (.6)^{4} \\ + \quad {8 \choose 5} (.4)^{3} (.6)^{5} + {8 \choose 6} (.4)^{2} (.6)^{6} + {8 \choose 7} (.4)^{1} (.6)^{7} + {8 \choose 8} (.4)^{0} (.6)^{8}$

The probability that exactly 5 of 8 support the incumbent is the term

${8 \choose 5} (.4)^{3} (.6)^{5}$

So at least five of eight support is the sum of this term and beyond,

$p={8 \choose 5} (.4)^{3} (.6)^{5} + {8 \choose 6} (.4)^{2} (.6)^{6} + {8 \choose 7} (.4)^{1} (.6)^{7} + {8 \choose 8} (.4)^{0} (.6)^{8}$

No particularly easy way of calculating that except popping it into Wolfram Alpha which reports

$p = \dfrac{ 46413}{78125}$

Shouldn't half the terms work out to .6 ? Interestingly it's not exactly .6 but pretty close at .594.

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4 years ago

Amanda reads 15 pages of her 150 page book in 2 hours at this rate how long will it take her to read the entire book

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Ratio and proportion 15 pages/2hours=150 pages/x hours cross multiply 15x= 300 x-20 it will take Amanda 20 hours to read the entire book

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4 years ago

GrogVix [38]

I would use substitution because x is already solved for in the equation x= -2y and we can substitute it into 5x-y =44

Choice C

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