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3 years ago

Help me w this ty! lolllisndndnd

Mathematics

1 answer:

RoseWind [281]3 years ago

8 0

Square root of 4 is 2
Square root of 9 is 3
7 is between 4 and 9, so its square root is somewhere between 2 and 3, which means the correct answer is between P and Q

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Based on a sample of 150 textbooks at the store, you find an average of 70.69 and a standard deviation of 29.6. The point estima

Ugo [173]

Answer:

Step-by-step explanation:

Given that:

The sample size = 150

The sample mean = 70.69

The standard deviation = 29.60

The sample mean is equal to the point estimate of the population = 70.69

At 99% confidence interval level is:

∝ = 1 - 0.99

∝ = 0.01

The critical value:

$Z_{\alpha/2} = Z_{0.01/2} \\ \\ Z_{0.005} = 2.58 \ using \ Z \ tables$

The Margin of error = $Z_{\alpha/2} \times \dfrac{\sigma}{\sqrt{n}}$

$= 2.58 \times \dfrac{29.6}{\sqrt{150}}$

= 2.58 × 2.4168

≅ 6.235

At 99% confidence interval; the estimate of the population mean lies within the interval:

= $\overline x - E < \mu \ < \overline x + E$

= 70.69 - 6.235 < μ < 70.69 + 6.235

= 64.455 < μ < 76.925

= (64.455 , 76.925 )

6 0

3 years ago

Find the surface area of this cylinder??

valentinak56 [21]

Answer:

Step-by-step explanation:

A=ch

then,

2ft×2ft

4ft

4 0

3 years ago

Today, the population of Canyon Falls is 22{,}50022,50022, comma, 500 and the population of Swift Creek is 15{,}20015,20015, com

MariettaO [177]

Answer:

10 years

Step-by-step explanation:

Given :

Population of Canyon falls = 22500

Rate of decrease = 740 per year

Population after x years :

f(x) = 22500 - 740x ; x = number of years

Population of Swift Creek = 15200

Rate of Increase = 1500 per year

Population after x years :

f(x) = 15200 + 1500x ; x = number of years

Number of years when, population of swift creek will be twice that of Canyon falls

15200 + 1500x = 2(22500 - 740x)

15200 + 1500x = 45000 - 1480x

15200 - 45000 = - 1480x - 1500x

-29800 = - 2980x

x = 29800 / 2980

x = 10

After 10 years

4 0

3 years ago

natita [175]

Step-by-step explanation:

that's it b is for brings

b compliment is for doesn't bring

8 0

3 years ago

Please help geometry questions<br> find X

ladessa [460]

Answer:

Step-by-step explanation:

The line x originates from the center of the circle and forms a perpendicular line with line RS, which means that the line is bisected.

That means that line RT is half of line RS, or 7.

Then we can use the Pythagorean Theorem to find the measure of x.

$7^2+b^2=9^2$

$49+b^2=81$

$b^2=32$

b = √32

b ≈ 5.66

5 0

3 years ago