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krok68 [10]
3 years ago
7

Write an equation in slope-intercept form of the line that is perpendicular to the line represented by 8x-4y+9=0 and passes thro

ugh the point at (2, 3).
Mathematics
1 answer:
WARRIOR [948]3 years ago
4 0

Answer:

Step-by-step explanation:

y - 3 = (-1/2)(x - 2)

Solve 8x-4y+9=0 for y so as to find the slope of this given line:

8x + 9 = 4y, or y = 2x + 9/4.  The slope of the given line is 2.  The slope of any line perpendicular to this one is the negative reciprocal of 2, which is -1/2.

Use the point-slope formula:  y - k = m(x - h ).  (h, k) is (2, 3) and m is -1/2.

Then we have:  y - 3 = (-1/2)(x - 2)

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spin [16.1K]

Answer:

L x W x H

Step-by-step explanation:

if my calculations are correct the length is 2 the width is 3 and the height is 3

Therefore the answer is (2 x 3) = 6 x3

So the answer is 18.

Hope it helps, if it is incorrect than i am extremely sorry, wish you the best of luck and have a great day/midday/evening. BYYEEEEEEE

5 0
2 years ago
Graph y = -1/3x+5<br><br> will give brainiest
Mnenie [13.5K]

Answer:

THATS THE ANSWER

Step-by-step explanation:

3 0
3 years ago
5) In a certain supermarket, a sample of 60 customers who used a self-service checkout lane averaged 5.2 minutes of checkout tim
Ne4ueva [31]

Answer:

\S^2_p =\frac{(60-1)(3.1)^2 +(72 -1)(2.8)^2}{60 +72 -2}=8.643

S_p=2.940

t=\frac{(5.2 -6.1)-(0)}{2.940\sqrt{\frac{1}{60}+\frac{1}{72}}}=-1.751

df=60+72-2=130

p_v =P(t_{130}

Assuming a significance level of \alpha=0.05 we have that the p value is lower than this significance level so then we can conclude that the mean for checkout time is significantly less for people who use the self-service lane

Step-by-step explanation:

Data given

Our notation on this case :

n_1 =60 represent the sample size for people who used a self service

n_2 =72 represent the sample size for people who used a cashier

\bar X_1 =5.2 represent the sample mean for people who used a self service

\bar X_2 =6.1 represent the sample mean people who used a cashier

s_1=3.1 represent the sample standard deviation for people who used a self service

s_2=2.8 represent the sample standard deviation for people who used a cashier

Assumptions

When we have two independent samples from two normal distributions with equal variances we are assuming that  

\sigma^2_1 =\sigma^2_2 =\sigma^2

The statistic is given by:

t=\frac{(\bar X_1 -\bar X_2)-(\mu_{1}-\mu_2)}{S_p\sqrt{\frac{1}{n_1}+\frac{1}{n_2}}}

And t follows a t distribution with n_1+n_2 -2 degrees of freedom and the pooled variance S^2_p is given by this formula:

\S^2_p =\frac{(n_1-1)S^2_1 +(n_2 -1)S^2_2}{n_1 +n_2 -2}

System of hypothesis

Null hypothesis: \mu_1 \geq \mu_2

Alternative hypothesis: \mu_1 < \mu_2

This system is equivalent to:

Null hypothesis: \mu_1 - \mu_2 \geq 0

Alternative hypothesis: \mu_1 -\mu_2 < 0

We can find the pooled variance:

\S^2_p =\frac{(60-1)(3.1)^2 +(72 -1)(2.8)^2}{60 +72 -2}=8.643

And the deviation would be just the square root of the variance:

S_p=2.940

The statistic is given by:

t=\frac{(5.2 -6.1)-(0)}{2.940\sqrt{\frac{1}{60}+\frac{1}{72}}}=-1.751

The degrees of freedom are given by:

df=60+72-2=130

And now we can calculate the p value with:

p_v =P(t_{130}

Assuming a significance level of \alpha=0.05 we have that the p value is lower than this significance level so then we can conclude that the mean for checkout time is significantly less for people who use the self-service lane

5 0
3 years ago
I need a little help :)
Naily [24]

So firstly, square root 9a^2 and 49: 3a+7\sqrt{b}-a+\sqrt{b}


Next, combine like terms, and your answer will be 2a+8\sqrt{b} , or the third option.

3 0
3 years ago
Please help me I will mark brain-list
kozerog [31]

Answer:

q12 is 8

q13 is 81

Step-by-step explanation:

100*6 =600 / 75 = 8

90*72 = 6480 / 80 = 81

6 0
3 years ago
Read 2 more answers
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