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Irina18 [472]
2 years ago
15

Please help me find all the missing angles in the two problems

Mathematics
1 answer:
Yakvenalex [24]2 years ago
3 0

the answer for the second problem is x=99 degrees and y= 261 degrees

dunno the first problem :/

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A is a 4x4 matrix and A^2 + 4A - 5I = 0. If det(A+2I)>0, enter det(A+2I)
maw [93]
\mathbf A^2+4\mathbf A-5\mathbf I=0
\implies\mathbf A^2+4\mathbf A+4\mathbf I=(\mathbf A+2\mathbf I)^2=9\mathbf I
\implies\det\bigg((\mathbf A+2\mathbf I)^2\bigg)=\det(9\mathbf I)
\implies\det(\mathbf A+2\mathbf I)^2=9^4\det\mathbf I
\implies\det(\mathbf A+2\mathbf I)=\pm\sqrt{9^4}
\implies\det(\mathbf A+2\mathbf I)=9^2=81

where we take the positive root because we're told that the determinant is positive.
5 0
3 years ago
If u answer this question i will give you 100 points i swear
tamaranim1 [39]

Answer: point W

Step-by-step explanation:

5 0
3 years ago
A media poll of 500 air travelers surveyed in national airports found that 370 favor tighter security procedures in boarding pla
serg [7]

Answer:

92% Confidence interval:  (0.7078,0.7722)

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 500

Number of travelers who favor tight security, x = 370

\hat{p} = \dfrac{x}{n} = \dfrac{370}{500} = 0.74

92% Confidence interval:

\hat{p}\pm z_{stat}\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}

z_{critical}\text{ at}~\alpha_{0.08} = \pm 1.645

Putting the values, we get:

0.74\pm 1.645(\sqrt{\dfrac{0.74(1-0.74)}{500}}) = 0.74\pm 0.0322\\\\=(0.7078,0.7722)

3 0
3 years ago
The acceleration of an object due to gravity is 32 feet per second squared. What is acceleration due to gravity in inches per se
MrRa [10]
One foot = 12 inches.
32 feet = x inches
x/12=32/1
so 
x=12*32/1 inches per second^2
6 0
3 years ago
Read 2 more answers
What time is 5 3/4 hours after 11:32 pm?
ANTONII [103]
Correct answer is 4:13 am
6 0
3 years ago
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