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2 years ago

Please help!!!! ASAP

Mathematics

1 answer:

In-s [12.5K]2 years ago

8 0

Answer:

Step-by-step explanation:

I just put the first one in desmos to see if it was the same

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Find the set of values of x for which y is zero in<br>the equation y=(x + 2) (2x-2)

Alex777 [14]

Answer:

{ - 2, 1 }

Step-by-step explanation:

To determine the values let y = 0, that is

(x + 2)(2x - 2) = 0 ← in standard form

Equate each factor to zero and solve for x

x + 2 = 0 ⇒ x = - 2

2x - 2 = 0 ⇒ 2x = 2 ⇒ x = 1

The set of values are { - 2, 1 }

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2 years ago

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Trapezoid= 4 sides
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hexagon= 6 sides
octagon= 8 sides
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2 years ago

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The administrator of a nursing home would like to do a time-and-motion study of staff time spend per day performing nonemergency

WINSTONCH [101]

Answer:

32 days must be sampled to test the proposed hypothesis.

Step-by-step explanation:

Consider the provided information.

The average number of person-hours per day spent on these task was $\mu_0=16$ .

The actual value of μ is 12 hours or less i.e μ=12

She wants a test having α=0.05

The probability of a type II error of at most β=0.10 and σ=7.64.

δ = μ-μ0

= 12-16

= -4

Now use the formula for calculating the sample size:

$N=\frac{(Z_{\alpha}+Z_{\beta})^2\sigma^2}{\delta^2}$

Substitute the respective values.

$N=\frac{(Z_{0.05}+Z_{0.1})^2(7.64)^2}{(-4)^2}$

$N=\frac{(1.6449+1.2816)^2(7.64)^2}{16}$

$N=31.2437958482\approx 32$

Hence, 32 days must be sampled to test the proposed hypothesis.

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2 years ago

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Answer:
A

Explanation:
the common difference is 12. 51+12= 63

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belka [17]

10 students should be correct

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