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3 years ago

Which expression is equivalent to (x+2)(3x-3)

Mathematics

1 answer:

navik [9.2K]3 years ago

7 0

Answer:

$3x^2+3x-6$

Step-by-step explanation:

$\left(x+2\right)\left(3x-3\right)$

Use FOIL.

$x\cdot \:3x+x\left(-3\right)+2\cdot \:3x+2\left(-3\right)$

$3xx-3x+2\cdot \:3x-2\cdot \:3$

$3x^2-3x+2\cdot \:3x-2\cdot \:3$

$3x^2-3x+6x-6$

$3x^2+3x-6$

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Answer:

The value of the test statistic is $t = -2.09$

Step-by-step explanation:

The null hypothesis is:

$H_{0} = 6.6$

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$X = 6.5, \mu = 6.6, \sigma = \sqrt{0.64} = 0.8, n = 280$

$t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

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