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Stolb23 [73]
3 years ago
13

Solve ( 9 - r) ( 2 - 3r) using the FOIL method. QUICK PLEASE!

Mathematics
1 answer:
bazaltina [42]3 years ago
7 0

\huge\text{Hey there!}

\textsf{(9 - r)(2 - 3r)}

\textsf{= 9(2) + 9(-3r) + 2(-r) + (-r)(-3r)}

\mathsf{= 18 - 27r - 2r + 3r^2}

\mathsf{= 3r^2 + 18 - 27r - 2r}

\boxed{\large\text{COMBINE the LIKE TERMS}}

\mathsf{= 3r^2 + 18 + (-27r - 2r)}

\mathsf{= 3r^2 + 18 - 29r}

\mathsf{= 3r^2 - 29r + 18}

\boxed{\large\textsf{Therefore, your answer is: \large\boxed{\mathsf{3r^2 - 29r + 18}}}}\large\checkmark

\huge\text{Good luck on your assignment \& enjoy your day!}

~\frak{Amphitrite1040:)}

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The quality-control manager at a compact flourescent light bulb factory wants to test the claim that the mean life of a large sh
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Population standard deviation = σ=500 hours.

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Sample standard deviation=s=  600 hours.

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Z(0.10)=1.282  

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t= x`- u /s/√n

t= 6700-6500/600/√50

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6700± 1.645 (500/√50)

6700±116.336

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d. The range of CI [6583.336 ,6816.336] tells that the cfls having a different mean life lie in this range.

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