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Delvig [45]
3 years ago
6

Please can you help me on me question posted a picture

Mathematics
2 answers:
ladessa [460]3 years ago
6 0
For this case we have the following expression:
 y = (x + 3) ^ 2 + 53
 We rewrite the expression:
 y = (x ^ 2 + 6x + 9) + 53
 We add the constant term:
 y = x ^ 2 + 6x + 62
 Answer:
 
The standard equation of the polynomial for this case is given by:
 
y = x ^ 2 + 6x + 62
 
option B
tia_tia [17]3 years ago
5 0
I am 99% sure it is D.  Hope this helped! : )
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Tell whether this is a linear relationship, is not one, or it’s impossible to tell. Stan earned $15 on Monday, $45 on Tuesday, W
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In 1990, 1000 adults were randomly selected and each was asked if they smoked, 300
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Answer:

 The proportion of smokers was higher in 1990 than in 2000

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Solution

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The total number of sample 1 (n1) = 1000

Total  sample 2 number  (n2) = 2000

The number of favourable events (X1) = 300

The number of favourable events (X2) = 500

so,

p₁ = X₁/n₁ = 300/1000 = 0.3

p₂ = X₂/n₂ =500/2000 =0.25

α = 0.05

We are interested in testing the hypothesis.

The  hypothesis (Null) ....>  H₀ : p₁ = p₂

Alternate hypothesis------ > H₁ : p₁ > p₂

Thus,

P = X₁ + X₂/ n₁ + n₂

P =300 + 500/1000 +2000

P =800/3000

=0.2667

Now,

Z₀ = P₁ - P₂/√ P (1 -P) (1/n₁ + 1/n₂)

Z₀ =  0.3 - 0.25/√0.2667  (1 - 0.2667) (1/1000 + 1/2000)

Z₀ = 0.4999999999999999/√ 0.2667 (0.7333000000000001) (0.001 +0.0005)

Then,

Z₀ = 0.4999999999999999/√0.00029335666500000004

Z₀ = 2.9193

so,

zα/2 = z0.05/2 =z0.025

zα/2 = 1.6448536269514722

Now, we apply the decision rule:

Decision Rule: Reject the null hypothesis if the statistic value test is higher than the critical value 1.6448536269514722

The statistic value, 2.9193 is greater than the critical value 1.6448536269514722,  then we will reject the null hypothesis.

Therefore, the proportion of smokers was higher in 1990 than in 2000

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3 years ago
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