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3 years ago

I NEED HELP FAST PLEASE

Mathematics

1 answer:

Stells [14]3 years ago

8 0

Answer:

The second and fourth option

Step-by-step explanation:

In order for two lines to be perpendicular they must intercept each other and their slope must be the opposite inverse; ex: $\frac{-1}{4}$ the negative inverse is 4 (multiplying by -1 and flipping the fraction)

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In a random sample of 30 people who rode a roller coaster one day, the mean wait time is 46.7 minutes with a standard deviation

Rainbow [258]

Answer: C. $(29,\ 37.8)$

Step-by-step explanation:

The confidence interval for difference of two population mean is given by :-

$\overline{x}_1-\overline{x}_2\pm z_{\alpha/2}\sqrt{\dfrac{s_1^2}{n_1}+\dfrac{s_2^2}{n_2}}$

Given : Level of significance : $1-\alpha:0.99$

Then , significance level : $\alpha: 1-0.99=0.01$

Critical value : $z_{\alpha/2}=z_{0.005}=2.576$

$n_1=30\ ;\ n_2=50\\\\\overline{x}_1=46.7\ ;\ \overline{x}_2=13.3\\\\s_1=9.2\ ;\ s_2=1.9$

$46.7-13.3\pm(2.576)\sqrt{\dfrac{9.2^2}{30}+\dfrac{1.9^2}{50}}\approx33.4\pm4.38=(29.02\ ,37.78)\approx(29,\ 37.8)$

Hence, a 99% confidence interval for the difference between the mean wait times of everyone who rode both rides $(29,\ 37.8)$

5 0

4 years ago

Solve for missing side of the a) 81 feet b) 63 feet c) 120 feet d) 168 feet

Alex777 [14]

I can’t see the data did you forget to put it or like forget to put a picture???

8 0

3 years ago

Mrs. Avery's class ate 1/5 of their green pepper pizza and 9/12 of their pepperoni pizza. Which pizza did they eat more of?

Anton [14]

So what you have to do is make the denominators equal. You do that by finding out what number they can both go into which is 60. 12 can go into 60 5 times and so you have to do 9/12 times 5 which is 40/60. then 5 goes into 60 12 times so you have to do 1/5 times 5 which is 12/60. Then you see that 40/60 >12/60 therefore the class ate more of the pepperoni pizza

8 0

3 years ago

Read 2 more answers

A ball is kicked with an inicial velocity of

vesna_86 [32]

Answer:

bbbbbbbbbbbbbbbbbbbbbb

4 0

3 years ago

PLEASE HELP DUE SOON!WILL GIVE BRAINLIEST + POINTS! Thank you and stay safe! :’)

Semmy [17]

Both those are drawn to scale.

5. Isosceles right triangle, sides in ratio 1:1:√2 = x:x:24 so x/24=1/√2,

x = 24/√2 = 24(√2/2) = 12√2

Answer: D. 12√2

6. 1:1:√2 = 10 : AB : BC

BC = 10√2

Answer: A. 10√2 ft

4 0

3 years ago