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Darya [45]
3 years ago
13

What is the value of the expression 8^−2 ?

Mathematics
1 answer:
muminat3 years ago
7 0
_Brainliest if helped!

1 over 64 

8^2 = 64  , 8^-2 = 1/(8^2)  = 1/64 
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Five decreased by twice a number is same as five less than<br> three times the number.
sergejj [24]
Answer: If you are suppose to write an algebraic expression it is: 5 - 2x = 3x - 5
If you are suppose to solve the answer is:
5-2x=3x-5
-2x=3x-10
-5x=-10
x=2
8 0
2 years ago
Solve the system by using a matrix equation (Picture provided)
Katyanochek1 [597]

Answer:

Option b is correct (8,13).

Step-by-step explanation:

7x - 4y = 4

10x - 6y =2

it can be represented in matrix form as\left[\begin{array}{cc}7&-4\\10&-6\end{array}\right] \left[\begin{array}{c}x\\y\end{array}\right] = \left[\begin{array}{c}4\\2\end{array}\right]

A= \left[\begin{array}{cc}7&-4\\10&-6\end{array}\right]

X= \left[\begin{array}{c}x\\y\end{array}\right]

B= \left[\begin{array}{c}4\\2\end{array}\right]

i.e, AX=B

or X= A⁻¹ B

A⁻¹ = 1/|A| * Adj A

determinant of A = |A|= (7*-6) - (-4*10)

                                    = (-42)-(-40)

                                    = (-42) + 40 = -2

so, |A| = -2

Adj A=  \left[\begin{array}{cc}-6&4\\-10&7\end{array}\right]

A⁻¹ =  \left[\begin{array}{cc}-6&4\\-10&7\end{array}\right]/ -2

A⁻¹ =  \left[\begin{array}{cc}3&-2\\5&-7/2\end{array}\right]

X= A⁻¹ B

X=  \left[\begin{array}{cc}3&-2\\5&-7/2\end{array}\right] *\left[\begin{array}{c}4\\2\end{array}\right]

X= \left[\begin{array}{c}(3*4) + (-2*2)\\(5*4) + (-7/2*2)\end{array}\right]

X= \left[\begin{array}{c}12-4\\20-7\end{array}\right]

X= \left[\begin{array}{c}8\\13\end{array}\right]

x= 8, y= 13

solution set= (8,13).

Option b is correct.

3 0
3 years ago
(16 \8) + (24 \ 6)<br> 2<br> DONE
Marina86 [1]

Answer:

6

Step-by-step explanation:

Remember the Order of Operations:

Parentheses

Exponents

Multiplication/Division (whichever comes first)

Addition/Subtraction (whichever comes first)

In this case, we start by simplifying what is in the parentheses:

(16÷8)+(24÷6)

2+4

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3 0
2 years ago
Read 2 more answers
What is the circumference of the circle if r= 3.5 feet? Use 22/7 for pi
alexdok [17]

Answer:

circumference of circle=2πr

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hope it helps.

6 0
3 years ago
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I don’t understand geometry and need help doing this.
lorasvet [3.4K]

In first question Use trigonometry for finding angles

Similarly in second question use trigonometry to find value of x

In third question use formula 2πr to find circumference and radius is given to you in this question.

6 0
3 years ago
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