dwayne used row operstions on an augmented matrix representing a system of equations and obtained the following result. how many solutions does dwayne's system of equations have?

Answer:

x = 2

Step-by-step explanation:

Vertical angles are equal to each other. It means that,

∠A = ∠B

So,

20x+10 = 30x−10

Taking like terms together, we get :

20x-30x=-10-10

-10x=-20

x=2

So, the value of x is 2.

Answer:

quite not sure

Step-by-step explanation:

Answer:

C

Step-by-step explanation:

You are asking a group of people to gain knowledge, and through that, you would be conducting a survey.

Answer:

C.) y = 9

Step-by-step explanation:

Simply substitute in -2 for x.

y = -4(-2) + 1

y = 8 + 1

y = 9

Answer: 15

Step-by-step explanation:

Answer:

B). x=9

Step-by-step explanation:

4 x (5 + 4) =3 ×(x + 3)

36=3x+9

3x=27

x=9

Answer:

Step-by-step explanation:

18.60$

I believe is your answer ...

Answer: 1,080 dollars

Step-by-step explanation: Start with your initial value of $1,166.40 then subtract $86.40 to get $1,080.

Answer:

It's 1

Step-by-step explanation:

Answer:

y = -8

Step-by-step explanation:

to find the midpoint you add the two together then divide by 2

(4 + y) / 2 = -2

4 + y = -4

y = -8

Answer:

87

Step-by-step explanation:

16 × 6 = 96 cans

96 - 9 = 87

Answer:

87

Step-by-step explanation:

Answer:

250

Step-by-step explanation:

You do 20/.08 to get 250.

Answer:

2.5

Step-by-step explanation:20/8=2.5

Answer:

8/15

Step-by-step explanation:

(2/5)/(3/4)

keep change flip

2*4=8

5*3=15

8/15

Answer:

[tex]\frac{8}{15}[/tex]

Step-by-step explanation:

[tex]\frac{2}{5}[/tex] ÷ [tex]\frac{3}{4}[/tex]    (convert division to multiplication by inverting the second fraction)

= [tex]\frac{2}{5}[/tex] × [tex]\frac{4}{3}[/tex]   (combine fractions by multiplying numerator with numerator and denominator by denominator)

= [tex]\frac{(2)(4)}{(5)(3)}[/tex]

= [tex]\frac{8}{15}[/tex]

Answer:

[tex]\huge\boxed{7^{x-y}}[/tex]

Step-by-step explanation:

We can use basic exponent rules to simplify this expression.

We know that [tex]a^b \div a^c = a^{b-c}[/tex].

Since we have the same base (7) and different exponents (x, y), we can subtract the exponents and raise the base to that power.

[tex]7^{x-y}[/tex]

Hope this helped!

Answer:

if it helps try dividing those two numbers so like 25/7

Answer:

ab - a - b + 1 = (a - 1)(b - 1)

Step-by-step explanation:

Let us explain factorization by grouping

In the expression of 4 terms ax + by + bx + ay

Take every two terms have a common factor in a bracket

Take the common factor out of the brackets

Take the bracket as a common factor

Let us do these steps with our question

∵ ab - a - b + 1 is an expression of 4 terms

→ Take ab and a in a bracket, -b and 1 in another bracket

∴ ab - a - b + 1 = (ab - a) + (-b + 1)

→ Take a as a common factor from the 1st bracket and -1 from

   the 2nd bracket

∴ (ab - a) + (-b + 1) = a(b -1) + -1(b - 1)

→ Take the bracket (b - 1) as a common factor

∴ a(b -1) + -1(b - 1) = (b - 1)(a + -1)

∵ (+)(-) = (-)

∴ (b - 1)(a + -1) = (b - 1)(a -1)

→ Change the order of the bracket

∴ (b - 1)(a -1) = (a - 1)(b - 1)

∴ ab - a - b + 1 = (a - 1)(b - 1)

Answer:

x= -5

Step-by-step explanation:

3(5x+10)+10=6x-(x+10)

15x+30+10=6x-x-10

15x+40=5x-10

15x-5x=-10-40

10x=-50

x=-5

Answer:

x= -5

Step-by-step explanation:

trustttt mannn

x=45, we know 2x is 90 because it is a right angle, so we can divide 90 by two, to get 45. Now to substitute, 90+55+(45-10) = 180, therefore, this answer would make logical sense.

Answer:

5

Step-by-step explanation:

80 is at the top and 40 takes half of the bottom so the other half is 40.

15/120 = 0.125 so...

40x0.125 will be your answer.

You get 5.

Answer:

it would be 3.0 times 0.03 so the answer is 0.9

Answer:

8 b mod 12 is equal to 4.

Step-by-step explanation:

Use Dividend = Divisor × Quotient + Remainder

As b mod 12 = 5 (that is division of b by 12 gives a remainder of 5)

[tex]b=12k+5[/tex]

Here, k is any integer.

Multiply both sides of [tex]b=12k+5[/tex] by 8

[tex]8b=8(12k+5)\\8b=8(12k)+40[/tex]

write 40 in terms of 12

[tex]40=36+4=12(3)+4[/tex]

[tex]8b=8(12k)+12(3)+4\\8b=12(8k+3)+4[/tex]

Therefore,

8 b mod 12 is equal to 4.

Answer:

option #2

Step-by-step explanation:

Answer:

4

Step-by-step explanation:

Answer:

$31.50

Step-by-step explanation:

To solve this problem, create the equation

y = 0.10x + 25

Where x is equal to the number of international minutes and y is equaled to the total price paid. Since we are give the number of international minutes (the x), plug this into the equation and solve for y.

y = 0.10(65) + 25

y = 6.5 + 25

y = 31.5 or $31.50

Answer:

a????

Step-by-step explanation:

sorry if I'm wrong might be b

Answer:

D

Step-by-step explanation:

It is x<2 which means x can not be 2, so it is a dotted line, then x is anything less than 2, so it is shaded to the left.

Answer:

D. -i

Step-by-step explanation:

I took the quiz and got a 100%

The required value of the complex number [tex]i^{31}[/tex] = -i.

Given that,
To determine the value of complex numbers [tex]i^{31}[/tex].

In mathematics, it deals with numbers of operations according to the statements. There are four major arithmetic operators, addition, subtraction, multiplication and division,

The number that are constitute of real and imaginary numbers are called complex number. complex number can be represents as z = a+ ib ,where a = real part and bi = imaginary part.

Here,
[tex]i^4 = 1[/tex] and [tex]i^3 = -i[/tex]

For complex numbers [tex]i^{31}[/tex]

[tex]=i^{31}\\=(i^4)^7.i^3\\=1.-i\\=-i[/tex]

Thus, the required value of the complex number [tex]i^{31}[/tex] = -i.

Learn more about complex numbers here: https://brainly.com/question/28007020

#SPJ5

Answer:

Step-by-step explanation:

see attached

Answer:

-33.5, -71/2, or 35 1/2  they are all the same

Step-by-step explanation:

Answer:

Integers, and rational, I know this because -0.45 is a negative number   and because rational numbers include all categories.

Step-by-step explanation: