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3 years ago

Cornyia swims a 1/2 mile every 1/4 hour how long will it take to swim 2/ 1/2 miles

Mathematics

1 answer:

Pavlova-9 [17]3 years ago

5 0

Answer:

I'm unsure what the final fraction is but if you comment it I'll reply with the answer

Step-by-step explanation:

every hour she travels 2 miles, so in 30 minutes she will travel 1 mile, hopefully that can help

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A car costs £20000. Work out the price after a 5% discount.

Mandarinka [93]

Answer:

£19000

Step-by-step explanation:

Discount cost = 5% of 20000 = 5/100 x 20000 = 1000

SO, cost after discount = 20000 - 1000 = 19000

hope this helps

6 0

3 years ago

Calcular: E = (sec245o + tg45o) ctg37o - 2cos60o

Vlada [557]

Answer:

$-2.813$

Step-by-step explanation:

Se simplifica inicialmente la fórmula en términos de las funciones trigonométricas fundamentales (Initially, the formula is simplified in terms of fundamental trigonometric functions):

$(\sec 245^{\circ} + \tan 45^{\circ} )\cdot \cot 37^{\circ} - 2\cos 60^{\circ}$

$\left(\frac{1}{\cos 245^{\circ}}+\frac{\sin 45^{\circ}}{\cos 45^{\circ}} \right)\cdot \left(\frac{\cos 37^{\circ}}{\sin 37^{\circ}} \right) - 2\cdot \cos 60^{\circ}$

$(-2.366 + 1 )\cdot (1.327) - 1$

$-2.813$

7 0

3 years ago

The ordered pair (1,81), (2,100), (3,121), 5,169).. represent a function. What is a rule that represent this function?

zloy xaker [14]

A rule that represents this function is y = (x + 8)².

The rule looks like √y = (x + 8)

Now square both sides

y = (x + 8)²

y = x² + 16x + 64

I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

8 0

2 years ago

Use the confidence interval to find the estimated margin of error. Then find the sample mean. A biologist reports a confidence i

Pavlova-9 [17]

Answer:

$\bar X = \frac{Lower +Upper}{2}$

$\bar X= \frac{1.9+3.3}{2}= 2.6$

And the margin of error with this one:

$\bar X = \frac{Upper-Lower}{2}$

$ME = \frac{3.3-1.9}{2}= 0.7$

Step-by-step explanation:

Assuming that the parameter of interest is the sample mean $\mu$ . And we can estimate this parameter with a confidence interval given by this formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

For this case the confidence interval is given by (1.9, 3.3)

Since the confidence interval is symmetrical we can estimate the sample mean with this formula:

$\bar X = \frac{Lower +Upper}{2}$

$\bar X= \frac{1.9+3.3}{2}= 2.6$

And the margin of error with this one:

$\bar X = \frac{Upper-Lower}{2}$

$ME = \frac{3.3-1.9}{2}= 0.7$

7 0

3 years ago

Because the car that has a terrible oil leak not only as a new battery for the van but also slows him down because he needs the

Thepotemich [5.8K]

11 hours and 15 minutes to drive 500 miles

5 0

3 years ago