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LiRa [457]
2 years ago
6

Multiply.

Mathematics
1 answer:
maksim [4K]2 years ago
6 0

Answer:

−25/42

Step-by-step explanation:

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A 50 centimeter piece of wire is bent into a circle. What is the area of this circle?
Korvikt [17]

Answer:

198.95 cm²

Step-by-step explanation:

Circumference = 50cm

C = πD

D = C/π

r = D/2

r = 50/π/2

r= 7.957747…..cm

Area = π r²

A = π x 7.957747….²

A = 198.95 cm² (2dp)

6 0
3 years ago
Which of the following triangle congruence theorems would be used in this proof?
HACTEHA [7]

The answer is SSS congruency.

AB=CD (given)

BC=DA (given)

AC=AC (common side)

∴ΔADC≅ΔABC

Please mark brainliest if this helps!

5 0
3 years ago
M1 Matrix is:
harkovskaia [24]

Answer:

(a)First Row, First Column =1

(b)First Row, second Column =0

(c)Second Row, First Column =0

(d)Second Row, second Column =1

Step-by-step explanation:

Given matrix M=\left(\begin{array}{ccc}-5&3\\-8&5\end{array}\right)

The Inverse of a 2X2 matrix

A=\left(\begin{array}{ccc}a&b\\c&d\end{array}\right)

can be found using the following:

A^{-1}=\dfrac{1}{ad-bc} \left(\begin{array}{ccc}d&-b\\-c&a\end{array}\right)

Therefore:

M^{-1}=\dfrac{1}{(5*-5)-(3*-8)} \left(\begin{array}{ccc}5&-3\\8&-5\end{array}\right)\\=-1\left(\begin{array}{ccc}5&-3\\8&-5\end{array}\right)\\=\left(\begin{array}{ccc}-5&3\\-8&5\end{array}\right)

Next, we find the product M^{-1}M

M^{-1}M=\left(\begin{array}{ccc}-5&3\\-8&5\end{array}\right)\left(\begin{array}{ccc}-5&3\\-8&5\end{array}\right)\\=\left(\begin{array}{ccc}-5*-5+3*-8&-5*3+3*5\\-8*-5+5*-8&-8*3+5*5\end{array}\right)\\=\left(\begin{array}{ccc}1&0\\0&1\end{array}\right)

Therefore:

(a)First Row, First Column =1

(b)First Row, second Column =0

(c)Second Row, First Column =0

(d)Second Row, second Column =1

NOTE: The multiplication of a matrix and its inverse always gives the identity matrix as seen above,

7 0
3 years ago
How do I find the derivative of the problem:<br> f(x) = x^2 + x at x= -1
Bond [772]
The derivate is. f'(x)=2x+1 .then f'(-1)=-2+1=-1
3 0
3 years ago
Solve pls brainliest
Andreyy89

Answer:

1. 9

2. 5

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
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