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liq [111]
2 years ago
12

Helllp pls help and don’t comment if u don’t know

Mathematics
2 answers:
k0ka [10]2 years ago
7 0

For the first one Answer:7z^3 −2z+1+2z^2

Step-by-step explanation:

(7z ^3

+ 4z −1)+(2z^2

− 6z +2)

Combine 4z and −6z to get −2z.

7z3  − 2z −1 + 2z2  +2

Add −1 and 2 to get 1.

7z3  − 2z + 1 + 2z2

inna [77]2 years ago
4 0

Answer:

a) 7z³+2z²-2z+1

b)2x²+3x-8

Step-by-step explanation:

a) (7z³+4z-1)+(2z²-6z+2)

   7z³+2z²-2z+1

b) (5x²-2x-1)-(3x²-5x+7)

   5x²-2x-1-3x²+5x-7

   2x²+3x-8

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In the past, 35% of the students at ABC University were in the Business College, 35% of the students were in the Liberal Arts Co
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Answer:

The test statistic for Business College is -0.9944

The test statistic for Liberal Arts College is 1.1483

The test statistic for Education College is 0

Step-by-step explanation:

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Liberal Arts College = 35%

Education College = 30%

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Business College = 90

Liberal Arts College = 120

Education College = 90

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The percentage of Liberal Arts College,  = 120/300 × 100 = 40%

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z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p \cdot q}{n}}}

Where;

\hat p = The sample proportion

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n = The sample size

The test statistic for Business College is;

z=\dfrac{0.3-0.35}{\sqrt{\dfrac{0.35 \times 0.65}{90}}} \approx -0.9944

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z=\dfrac{0.4-0.35}{\sqrt{\dfrac{0.35 \times 0.65}{120}}} \approx 1.1483

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2 years ago
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