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SSSSS [86.1K]
3 years ago
5

HELPPP ITS AN EMERGENCY!!!!!!

Mathematics
1 answer:
attashe74 [19]3 years ago
5 0

Answer:

The equation in point-slope is \mathbf{y+5=3(x-6)}

Step-by-step explanation:

We need to write the point-slope form of the equation of the line passing through the point (6,-5) and perpendicular to the line y=-\frac{1}{3}x+4

The general form of point-slope is; y-y_1=m(x-x_1)

where m is slope and (x_1,y_1) is the point

We need to calculate slope.

We are given equation of line y=-\frac{1}{3}x+4 that is perpendicular to the required line.

The equation is given in slope-intercept form y=mx+b where m is slope.

Comparing both equations we get m= -1/3

But we know that when lines are perpendicular their slopes are opposite reciprocal of each other i.e m=-\frac{1}{m}

<em>So, </em><em>slope of required line is m = 3 </em><em>(opposite reciprocal of -1/3)</em>

Now, the equation in point-slope form having slope m=3 and point (6,-5) is

y-y_1=m(x-x_1)\\y-(-5)=3(x-6)\\y+5=3(x-6)

So, The equation in point-slope is \mathbf{y+5=3(x-6)}

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Dmitry_Shevchenko [17]
285*0.078=22.23
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3 years ago
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Find the value of the expression if sin beta= 0.45, find cos(pi/2-beta)
pav-90 [236]
If sin β = 0.45, we have to find cos ( π/2 - β ).
We know that: sin x = cos ( 90° - x ), or sin x = cos ( π/2 - x ). 
For example:  sin 60° = cos 30°.
cos ( π/2 - β ) = sin β = 0.45
Answer: 0.45
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4 years ago
Adding/subtracting polynomials <br>​
Nuetrik [128]

Answer:

g(x) - h(x) =  { - x}^{4}  - 11x

Step-by-step explanation:

g(x) =  {6x}^{2}  - 4x +  {3x}^{4}

h(x) =  {6x}^{2}  + 4 {x}^{4}  + 7x

g(x) - h(x)

({6x}^{2}  - 4x +  {3x}^{4})  - ( {6x}^{2}  + 4 {x}^{4}  + 7x)

{6x}^{2}  - 4x +  {3x}^{4}   - {6x}^{2}   -  4 {x}^{4}   -  7x

( {3x}^{4}  -  {4x}^{4}) +  ( {6x}^{2}  - 6x {}^{2} ) + ( - 4x - 7x)

{ - x}^{4}  - 11x

6 0
3 years ago
4a-5b:5a+4b=1:3 then find the value of a:b​
aleksley [76]

Answer:

a : b = 19 : 7

Step-by-step explanation:

Given

4a - 5b  : 5a + 4b = 1 : 3

Expressing in fractional form, that is

\frac{4a-5b}{5a+4b} = \frac{1}{3} ( cross- multiply )

3(4a - 5b) = 5a + 4b ← distribute left side

12a - 15b = 5a + 4b ( subtract 5a from both sides )

7a - 15b = 4b ( add 15b to both sides )

7a = 19b ( divide both sides by 7 )

a = \frac{19}{7} b ( divide both sides by b )

\frac{a}{b} = \frac{19}{7}

That is a : b = 19 : 7

7 0
3 years ago
Read 2 more answers
The time until recharge for a battery in a laptop computer under common conditions is normally distributed with mean of 265 minu
pochemuha

Answer:

a) 0.691 = 69.1% probability that a battery lasts more than four hours

b) 25% value = 231

75% value = 299

c) 183 minutes

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 265, \sigma = 50

a) What is the probability that a battery lasts more than four hours?

4 hours = 4*60 = 240 minutes

This is 1 subtracted by the pvalue of Z when X = 240. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{240 - 265}{50}

Z = -0.5

Z = -0.5 has a pvalue of 0.309

1 - 0.309 = 0.691

0.691 = 69.1% probability that a battery lasts more than four hours

b) What are the quartiles (the 25% and 75% values) of battery life?

25th percentile:

X when Z has a pvalue of 0.25. So X when Z = -0.675

Z = \frac{X - \mu}{\sigma}

-0.675 = \frac{X - 265}{50}

X - 265 = -0.675*50

X = 231

75th percentile:

X when Z has a pvalue of 0.75. So X when Z = 0.675

Z = \frac{X - \mu}{\sigma}

0.675 = \frac{X - 265}{50}

X - 265 = 0.675*50

X = 299

25% value = 231

75% value = 299

c) What value of life in minutes is exceeded with 95% probability?

The 100-95 = 5th percentile, which is the value of X when Z has a pvalue of 0.05. So X when Z = -1.645.

Z = \frac{X - \mu}{\sigma}

-1.645 = \frac{X - 265}{50}

X - 265 = -1.645*50

X = 183

8 0
4 years ago
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