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3 years ago

9

Help with 12 please

1 answer:

lesya [120]3 years ago

6 0

4(4v + 6p) =
16v + 24p <== ur simplified expression

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2 years ago

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Zielflug [23.3K]

I don't know about the first one but for the second one:

${2}^{3x + 2} - {2}^{3x} = 48 \\ \Leftrightarrow {2}^{3x} {2}^{2} - {2}^{3x} = 48 \\ \Leftrightarrow {2}^{3x} ( 4 - 1) = 48 \\ \Leftrightarrow 3 \times {2}^{3x} = 48 \\ \Leftrightarrow {2}^{3x} = 16 \\ \Leftrightarrow {2}^{3x} = {2}^{4} \\ \Leftrightarrow 3x = 4\Leftrightarrow x = \frac{4}{3}$

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2 years ago

3x+8=2x+21<br> X=?<br> (all working out needed)

Dahasolnce [82]

Answer:

x=13

Step-by-step explanation:

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8 0

2 years ago

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gavmur [86]

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8 0

2 years ago

The distribution of SAT scores of all college-bound seniors taking the SAT in 2014 was approximately normal with a mean of 14971

RideAnS [48]

Answer:

P(X<1200) is 0.8212

Step-by-step explanation:

Test statistic (z) = (X - mean)/sd

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mean = 1497

sd = 322

z = (1200 - 1497)/322 = -297/322 = -0.92

The cumulative area of the test statistic is the probability that X<1200. The cumulative area is 0.8212.

Therefore, P(X<1200) = 0.8212

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2 years ago

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