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3 years ago

HELP QUICK PLEASE!!

Mathematics

1 answer:

horsena [70]3 years ago

4 0

$\huge\mathfrak\red{Its\:letter\:D}$

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What's 3x + 10 - x + 12

Zinaida [17]

2x+22 is the answer.

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3 years ago

Read 2 more answers

What is the r-value of the following data, to three decimal places

Mrrafil [7]

<h2>Answer:</h2>

Option: A is the correct answer.

A. -0.903

<h2>Step-by-step explanation:</h2>

The formula to calculate correlation coefficient r is given by:

$r=\dfrac{n\sum xy-(\sum x)(\sum y)}{\sqrt{n(\sum x^2)-(\sum x)^2}\sqrt{n(\sum y^2)-(\sum y)^2}}$

x y xy x² y²

4 23 92 16 529

5 12 60 25 144

8 10 80 64 100

9 9 81 81 81

13 2 26 169 4

-------------------------------------------------------------------------

∑ 39 56 339 355 858

Also n=5 ( as there are 5 data points )

Hence, we get:

$r=\dfrac{5\times 339-39\times 56}{\sqrt{5\times 355-(39)^2}\times \sqrt{5\times 858-(56)^2}}\\\\\\r=\dfrac{-489}{\sqrt{254}\times \sqrt{1154}}\\$

$r=-\dfrac{489}{541.40188}=-0.9032$

Hence, the r-value of the following data, to three decimal places is:

A. -0.932

8 0

4 years ago

If a person can see 6 miles from a height of 25 feet, how far can a person see from a height of 196 feet?

Aleksandr-060686 [28]

Answer:

47,04 miles

Step-by-step explanation:

you can clearly see something 20 feet away that you should be able to see from that distance. If a person can see 6 miles from a height of 25 feet, by dividing 196 by 25 we can get the following calculation

196 ÷ 25 = 7,84

Then you gan multiply

7,84 × 6 = 47,04 miles

Or equal to 75703,542 meters

8 0

3 years ago

During the exponential phase, E. coli bacteria in a culture increase in number at a rate proportional to the current population.

NikAS [45]

Answer:

197.2 million

Step-by-step explanation:

The appropriate exponential equation for the population is ...

p(t) = 172.0e^(0.019t)

Then we can compute for t=7.2:

p(7.2) = 172.0e^(0.019·7.2) ≈ 172.0·1.146599 ≈ 197.2

7.2 minutes from now, the population will be about 197.2 million.

___

For continuous growth (or continuous compounding), the exponential formula is ...

f(t) = (value at t=0)×e^(rt)

where r is the growth rate in one unit of time, and t is the number of time periods.

8 0

3 years ago

The expression sin(23°)cos(7°) + cos(23º)sin(7°) is equivalent to

jeka94

Answer:

$\sin(30)$

Step-by-step explanation:

Given

$\sin(23) \cos(7) + \cos(23) \sin(7)$

Required

An equivalent expression

The above is an illustration of the sine formula which states:

$\sin(A) \cos(B) + \cos(A) \sin(B) = \sin(A + B)$

In this case:

$A = 23\\ B = 7$

So:

$\sin(23) \cos(7) + \cos(23) \sin(7) = \sin(23 + 7)$

$\sin(23) \cos(7) + \cos(23) \sin(7) = \sin(30)$

Hence, an equivalent expression is: $\sin(30)$

8 0

3 years ago