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3 years ago

-x^2-4x-2=2 using quadratic formula

Mathematics

1 answer:

Natasha2012 [34]3 years ago

7 0

The answer to this would be x= -2

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Refer to the previous exercise. The researchers wanted a sufficiently large sample to be able to estimate the probability of pre

Maru [420]

Answer:

The large sample n = 117.07

Step-by-step explanation:

Step(i):-

Given that the estimate error (M.E) = 0.08

The proportion (p) = 0.75

q =1-p = 1- 0.75 =0.25

Level of significance = 0.05

Z₀.₀₅ = 1.96≅ 2

Step(ii):-

The Marginal error is determined by

M.E = $\frac{Z_{0.05} \sqrt{p(1-p)} }{\sqrt{n} }$

$0.08 = \frac{2 X \sqrt{0.75(1-0.75)} }{\sqrt{n} }$

Cross multiplication , we get

$\sqrt{n} = \frac{2 X \sqrt{0.75(1-0.75)} }{0.08 }$

√n = $\frac{2 X0.4330}{0.08} = 10.825$

squaring on both sides , we get

n = 117.07

Final answer:-

The large sample n = 117.07

6 0

3 years ago

To the nearest ten thousand the population of vermont was estimated to be about 620000 in 2008 which might have been the exact p

harina [27]

618,792 could have been the exact population.

since you are rounding to the nearest ten thousand, you would round my number up.

3 0

4 years ago

A choir teacher is dividing 12 sopranos and 9 altos into singing groups. He wants each group to have the same combination of sop

almond37 [142]

Answer:

3 groups

Step-by-step explanation:

Sopranos = 12

Altos = 9

Find the highest common factor of 12 and 9

12 = 1, 2, 3, 4, 6, 12

9 = 1, 3, 9

The highest common factor of 12 and 9 is 3

Therefore, the choir teacher can only have 3 groups

12 sopranos / 3 groups

= 4 sopranos per group

9 Altos / 3 groups

= 3 altos per group

Each of the 3 groups Will have 4 sopranos and 3 altos each

3 0

3 years ago

PLEASE ANSWER THIS I AM ON THE LAST SRAW WITH MY MOM

jekas [21]

Answer:

A .25

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

Please help. Algebra.

Nitella [24]

Answer:

d. 8yx^2

Step-by-step explanation:

Multiply the coefficients: 2 x 4 = 8

Multiply the exponents by adding them together: -2 + 4 = 2

5 0

3 years ago