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3 years ago

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For each set of angles name the angle pair and find the missing measurement Type of angle pair 2) These angles are to 1340 SO...

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1 answer:

AfilCa [17]3 years ago

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Question 19 (4 points)

wolverine [178]

He made the first error in number 3

8 0

2 years ago

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Can someone please answer it correctly if it’s correct I will mark you brainliest

snow_tiger [21]

Answer:

6 blooms

Step-by-step explanation:

40 x 15%

40 x 0.15 = 6

3 0

3 years ago

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Find the values of λ for which the determinant is zero.

elena55 [62]

Answer:

Determinant are special number that can only be defined for square matrices.

Step-by-step explanation:

Determinant are particularly important for analysis. The inverse of a matrix exist, if the determinant is not equal to zero.

How to find determinant

For a 2×2 matrix

$det ( \left[\begin{array}{cc}x&y\\a&z\end{array}\right] ) = xz-ay$

For a 3×3 matrix

we first decompose it to 2×2

$det (\left[\begin{array}{ccc}k&l&m\\o&p&q\\r&s&t\end{array}\right] )\\\\= k*det(\left[\begin{array}{cc}p&q\\s&t\end{array}\right] ) - l*det(\left[\begin{array}{cc}o&q\\r&t\end{array}\right] ) + m*det(\left[\begin{array}{cc}o&p\\r&s\end{array}\right] ) \\\\=k(pt-sq) - l(ot-rq) + m(os-rp)$

Example

Find the values of λ for which the determinant is zero

$\left[\begin{array}{ccc}s&-1&0\\-1&s&-1\\0&-1&1\end{array}\right]$

$det(\left[\begin{array}{ccc}s&-1&0\\-1&s&-1\\0&-1&1\end{array}\right])\\\\= s*det(\left[\begin{array}{cc}s&-1\\-1&1\end{array}\right] ) - (-1)*det(\left[\begin{array}{cc}-1&-1\\0&1\end{array}\right] ) + 0*det(\left[\begin{array}{cc}-1&s\\0&-1\end{array}\right] )\\\\= s(s(1)-(-1*-1)) - (-1)(-1*1 - (-1*0)) + 0\\= s(s - 1)) + 1(-1 + 0) \\=s^{2} -s-1$

Equating the determinant to zero

$s^{2} -s-1 =0\\$

s = $\frac{1}{2}$ * (1 ±5 )

s = 1.61 or -0.61

5 0

3 years ago

Aishas mother is five times older than aisha.the sum of their ages is 30.how old is aisha?

Cloud [144]

m = 5a

m + a = 30

Because we already know the value of m, we can find the value of a.

5a + a = 30

<em><u>Combine like terms.</u></em>

6a = 30

<em><u>Divide both sides by 6</u></em>

a = 5

Now that we know the value of a, we can find the true value of m.

m = 5a

m = 5 * 5

m = 25

Aisha is 5 years old, and Aisha's mother is 25 years old. (This is your answer.)

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3 years ago

A bird leaves its nest and travels 18 miles per hour downwind for x hours. On the return trip, the bird travels 3 miles per hour

Butoxors [25]

Answer:

distance down wind

d - 6 = distance back

time = distance ÷ speed

x = d/20

x = (d - 6)/(16)

so d/20 = (d - 6)/16. Cross multiply

20d - 120 = 16d

-120 = -4d

30 = d so the whole trip assuming the bird gets back to the starting point is 60 miles

4 0

2 years ago

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