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3 years ago

PLZ HELP!

Mathematics

1 answer:

Shtirlitz [24]3 years ago

8 0

Answer:

vertex and x= -b/2a = 0

second point, when x=1, y=3

third point the mirror of the second point over the vertex

Step-by-step explanation:

Do as described

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What are the zeros of the quadratic function f(w)=2w^2+7w-4

gogolik [260]

Answer:f(w)=w^3 + 7/2w^2-4w+c

Step-by-step explanation:

3 0

3 years ago

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Peter is x years old and his sister is 5 years older. If the product of their ages is 84, form an equation in x and solve it to

daser333 [38]

Answer:

x^2 + 5x - 84 = 0

x = 7

Step-by-step explanation:

let the sister's age = y

sister's age (y) = 5 + x equation 1

xy = 84 equation 2

Make y the subject of the formula in equation 2

y = 84/x

equate equation 1 and 2

84/x = 5 + x equation 3

Multiply equation 3 by x

84 = 5x + x^2

x^2 + 5x - 84 = 0

tjis can be solved using quadratic equation

x^2 -7x + 12x -84 = 0

x(x + 12) -7(x + 12)

x = 7 or - 12

age cant be negative so his age is 7

3 0

3 years ago

Select the conic section that represents the equation.

Oksanka [162]

It would by 'hyberbola'

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4 years ago

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Pls help :((( D:::: this is hard

Naily [24]

Answer:

it's B, y= y/x

Step-by-step explanation:

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3 years ago

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In a survey of 447 registered voters, 157 of them wished to see Mayor Waffleskate lose her next election. The Waffleskate campai

Hitman42 [59]

<h2>Answer with explanation:</h2>

Let p be the true proportion of registered voters wish to see Mayor Waffleskate defeated.

As per given , we have

$H_0: p\leq0.27\\\\ H_a: p >0.27$

Sample size : n= 447

Number of of registered voters wish to see Mayor Waffleskate defeated = 157

I.e. sample proportion : $\hat{p}=\dfrac{157}{447}\approx0.3512$

Confidence interval for population proportion is given by :-

$\hat{p}\pm z^*\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$

, where n= sample size

$\hat{p}$ = sample proportion

z* = critical z-value.

Critical z-value for 98% confidence interval is 2.33. (By z-table)

Then, the 98% confidence interval for the proportion of registered voters who wish to see Waffleskate defeated will be :

$0.3512\pm2.33\sqrt{\dfrac{0.3512(1-0.3512)}{447}}\\\\=0.3512\pm (2.33)(0.022577656)\\\\=0.3512\pm 0.05260593848\\\\=(0.3512-0.05260593848,\ 0.3512+0.05260593848)\\\\=(0.29859406152,\ 0.40380593848)\approx(0.299,\ 0.404)$

Since the 0.27 < 0.299 , it means 0.27 does not belong to the above confidence interval.

So , we reject the null hypothesis ( $H_0$ ).

So , <u>98% confidence interval does not support the claim.</u>

3 0

3 years ago