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3 years ago

A person is standing 215 feet above the ocean

Mathematics

2 answers:

Eva8 [605]3 years ago

7 0

Answer:

Step-by-step explanation: I don’t know I just want my extra points

NNADVOKAT [17]3 years ago

3 0

Answer: 164 ft

Step-by-step explanation:

tan 48=215/x

-> x.tan48=215

->x =215/tan 48

->x = 193.6

tan 31=215/y

-> y.tan31 = 215

-> y= 215/ tan 31

-> y= 357.82

BC= y-x

= 357.82-193.6

= 164.22 = 164 ft

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50 points!!!!!! and brainliest if answered correctly 6-10 please show work

vladimir2022 [97]

Answer:

6) y = 4x

y = 3x - 1

=> 4x = 3x - 1

=> x = -1

=> y = 4(-1) = -4

7) y = 3x

y = 2x - 3

=> 3x = 2x - 3

=> x = -3

=> y = 3(-3) = -9

8) y = 2x

y = x - 4

=> 2x = x - 4

=> x = -4

=> y = 2(-4) = -8

9) y = 3x

y = 2x + 3

=> 3x = 2x + 3

=> x = 3

=> y = 3(3) = 9

10) y = 5x

y = 4x - 6

=> 5x = 4x - 6

=> x = -6

=> y = 5(-6) = -30

3 0

2 years ago

In 36 randomly selected seawater samples, the mean sodium chloride concentration was 23 cubic centimeters per cubic meter. Assum

Ludmilka [50]

Answer: 90% confidence interval for population mean =(21.163, 24.837)

95% confidence interval for population mean =(20.811, 25.189)

Step-by-step explanation:

Confidence interval for population mean ( $\mu$ ) is given by :-

$\overline{x}\pm z \dfrac{\sigma}{\sqrt{n}}$ , where n= sample size, z= critical z-value , $\overline{x}$ = sample mean $\sigma$ = population standard deviation.

Given : n= 36 , $\overline{x}=23$ cubic centimeters per cubic meter.

$\sigma=6.7$ cubic centimeters per cubic meter

For 90% confidence level , z= 1.645 [by z-table]

Then, required interval for population mean ( $\mu$ ) would be :

$23\pm (1.645) \dfrac{6.7}{\sqrt{36}}$

$=23\pm 1.837$

$=(23-1.837 , 23+ 1.837)=(21.163, 24.837)$

For 95% confidence level , z= 1.96 [by z-table]

Then, required interval for population mean ( $\mu$ ) would be :

$23\pm (1.96) \dfrac{6.7}{\sqrt{36}}$

$=23\pm 2.189$

$=(23-2.189 , 23+ 2.189)=(20.811, 25.189)$

Hence, 90% confidence interval for population mean =(21.163, 24.837)

95% confidence interval for population mean =(20.811, 25.189)

5 0

3 years ago

Will give someone BRAINLIEST for who gives the correct answer fast!!!!!!!

tatyana61 [14]

Answer:4

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

What is the value of X and Y?

Advocard [28]

Answer:

x = 5.25

y = 7.5

Step-by-step explanation:

Since line 1.5 is parallel to line x which is parallel to line y

then 2/(2+5) = 1.5/x

2x = 7(1.5)

2x = 10.5

x = 5.25

Similarly, 2/(2 + 5 + 3) = 1.5/y

2y = 10(1.5)

2y = 15

y = 7.5

3 0

2 years ago

I am multiple of 20 i have 3 digits my hundreds digit and tens digit add to make 9 half of me is less than 100 what am i

ASHA 777 [7]

Answer:

180

Step-by-step explanation:

Given :

the number has three digits

it is multiple of 20

hundreds digit and tens digit add to make 9

half of it is less than 100.

I suppose 180 can correctly fit into all above criterions

It is 3 digit number. 1+8 =9, 180/2 =90 which is less than 100.

4 0

3 years ago