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viva [34]
3 years ago
8

Will mark brainliest :) Given vectors u = -9i + 8j and v = 7i + 5j find 2u -6j in terms of unit vectors i and j

Mathematics
2 answers:
Jet001 [13]3 years ago
8 0

Answer:

the answer is option number b..

a_sh-v [17]3 years ago
4 0

Answer:

b.

Step-by-step explanation:

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krek1111 [17]
The graph is a function because when you use the vertical line test it does not hit more than one point at any given place on the line.

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3 years ago
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To solve -9 - 16m = 7, what steps would you use?
Ne4ueva [31]

First your going to add 9 to both sides.

-9-16m=7  --->  16m=16

then you just divide them. so m should equal 1


7 0
3 years ago
Find the coordinates of the midpoint of<br> segment XY for X(-2, 3) and Y(-8, -9).
marshall27 [118]

Answer:

use formula

(x,y) =[ (x1+x2)/2 ,(y1+y2/2)]

=[(-2-8)/2, (3-9)/2]

=(-10/2 ,-6/2)

=(-5,-3)

4 0
3 years ago
In a sample of 8 high school students, they spent an average of 28.8 hours each week doing sports with a sample standard deviati
Alja [10]

Answer:

26.12\:

Step-by-step explanation:

Since the population standard deviation \sigma is unknown, and the sample standard deviation s, must replace it, the t distribution  must be used for the confidence interval.

The sample size is n=8.

The degree of freedom is df=n-1, \implies df=8-1=7.

With 95% confidence level, the \alpha-level(significance level) is 5%.

Hence with 7 degrees of freedom, t_{\frac{\alpha}{2} }=2.365. (Read from the t-distribution table see attachment)

The 95% confidence interval can be found by using the formula:

\bar X-t_{\frac{\alpha}{2}}(\frac{s}{\sqrt{n} } )\:.

The sample mean is \bar X=28.8 hours.

The sample sample standard deviation is s=3.2 hours.

We now substitute all these values into the formula to obtain:

28.8-2.365(\frac{3.2}{\sqrt{8} } )\:.

26.12\:

We are 95% confident that the population mean is between 26.12 and 31.48  hours.

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3 years ago
Which is the better buy $60 and 6 CDs or $72 and 8 CDs
skad [1K]

Answer:

$72 and 8 CDs is better.

Step-by-step explanation:

60/6 = 10 $/CD

72/8 = 9 $/CD

8 0
3 years ago
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