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laiz [17]
4 years ago
7

A general 2x2 diagonal matrix has the form(a00b). Thus the two unknown real numbers a b are needed to specify each 2x2 diagonal

matrix. In Exercises 11 16, how many unknown real numbers are needed to specify each of the given matrices
1. An upper triangular 2x2 matrix?
2.) An m × n matrix?
Mathematics
1 answer:
horsena [70]4 years ago
6 0

Answer:

1. 3, and 2. m x n

Step-by-step explanation:

1. for an upper triangular 2x2 matrix i.e. (a,0,c,d), three (03) unknown elements a, c, and d are needed to be specified.

2. for m x n matrix, m*n elements are needed to be specified.

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ElenaW [278]

Answer:

0.74 to 6.06

Step-by-step explanation:

The groups are independnet,

SE(xh bar-xa bar)=sqrt [sh^2/nh+sa^2/na]=sqrt [10.1^2/80+10.3^2/80]=1.61

At df=157, the t critical is 1.65

90%c.i=(xh bar-xa bar)+-tcritical SE(xh bar-xa bar)

=(25.2-21.8)+-1.65*1.61

=0.74 to 6.06

5 0
3 years ago
Which of these is an equation? A 2y + 7 = 9 B 2x > 3 C 3n + 5 D a2 + 2
nikklg [1K]

Answer:

Option A is correct answer.

Step-by-step explanation:

An equation is having two sides equal. It has an = sign in it.

So, Option A 2y+7 = 9 is an equation as it has = sign in it. So, it is correct option.

All other options do not have = sign in them so, they are not equations.

6 0
4 years ago
Determine which of the following statements is true concerning the values described in column #1 and column #2. Column #1 Column
Gelneren [198K]
Hi,


1)
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Vertex=(-1,14) \ x-coordinate=-1\\




2) 
y=x^2-4x+3=x^2-4x+4-1=(x-2)^2-1\\\\
Vertex=(2,-1) \ x-coordinate=2\\







3 0
3 years ago
Read 2 more answers
Round 7.76 to one decimal place
Gelneren [198K]
So if a number is 5 or greater you round up but if the number is 4 or less you round down so the number 6 is above five so you would round the 6 to 10 therefore making it 7.8 instead of 7.76
5 0
4 years ago
Plsss help me solve this problem
Shkiper50 [21]

Answer:

120 degrees

Step-by-step explanation:

you have to do 61 +59

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