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3 years ago

Help please I’m on a timer

Mathematics

1 answer:

iren2701 [21]3 years ago

7 0

All real numbers greater than or equal to -3

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How do i answer this question 5*(8-4)/4-2

NemiM [27]

the answer is 3

but a way to work these problems out is to use PEMDAS

p-parentheses

e-exponent

m-multiplication

d-division

a-addition

s-subtraction

they have to be donr in that order or the answer will come out different

6 0

2 years ago

A study sampled 350 upperclassmen (Group 1) and 250 underclassmen (Group 2) at high schools around the city of Portland. The stu

iVinArrow [24]

Answer:

$-0.061 < P_1 -P_2< 0.025$

Step-by-step explanation:

Give data:

$n_1 = 350$

$n_2 =250$

$x_1 = 23$

$x_2 = 21$

$\hat{P} 1 = \frac{x_1}{n_1} = \frac{23}{350} = 0.066$

$\hat{P} 2 = \frac{x_2}{n_2} = \frac{21}{250} = 0.084$

for 95% confidence interval

$\alpha = 1 - 0.95 = 0.05 and \alpha/2 = 0.025$

$z_{\alpha/2} = 1.96$ from standard z- table

confidence interval for P_1 and P_2 is

$\hat{P} 1 - \hat{P} 2 \pm z_{\alpja/2} \sqrt{\frac{\hat{P} 1(1-\hat{P} 1)}{n_1} +\frac{\hat{P} 2(1-\hat{P} 2)}{n_2}}$

$(0.066 - 0.084) \pm 1.96 \sqrt{\frac{0.066(1-0.066)}{350} +\frac{0.084(1-0.084)}{250}}$

$-0.018 \pm 0.043$

confidence interval is

$-0.018 - 0.043 < P_1 -P_2$

$-0.061 < P_1 -P_2< 0.025$

7 0

2 years ago

Pythagorean theorem in 3D.

Mekhanik [1.2K]

Answer:

Step-by-step explanation:

2^2 + 5^2 = s^2

s^2 = 4 + 25

s^2 = 29

s = sqrt(29)

s = 5.4

6 0

3 years ago

Is the simplified form of 2-3 + 3.3 rational?<br> Yes<br> No

N76 [4]

Answer:

YES IT IS

Step-by-step explanation:

2-3 + 3.3

= -1 + 3.3

= -4.3

We learn that:

Rational number: rational number is the number that can be written as a/b (a and b would be intergers and b is not equal to 0). Rational number would be most of numbers we use in out life, except Square root and Pi number.

In this case, -4.3 can be write as -43/10

So YES it would be a rational number

Hope this helped :3

6 0

3 years ago

Write each product using an exponent: example 6x6==

swat32

Since 6x6 equals 36, then 6² would be the exponent because 6² is the same as 6x6

3 0

2 years ago