What is the value of -2xy if x = -1 and y = 6?

12
-12
26
8

The expression 13 - (-21) simplifies to 34.

The expression 13 - (-21) can be simplified as follows:

So, the expression 13 - (-21) is equivalent to 34.

To find the equivalent expression for \(13 - (-21)\), you can simplify the subtraction of a negative number, which is the same as adding its positive counterpart. Therefore:

\[ 13 - (-21) \]

is equivalent to:

\[ 13 + 21 \]

Among the given choices, the expression that matches this result is:

\[ \text{(Choice D) } 13 + 21 \]

Final answer:

The expression 13 - (-21) is equivalent to 13 + 21 because we change the subtraction of a negative number to addition. The final result is 34.

Explanation:

The expression 13 - (-21) involves subtracting a negative number from a positive number. According to the rules for subtracting integers, we change the sign of the number being subtracted and then follow the rules for addition as follows:

Therefore, the expression 13 - (-21) is equivalent to 13 + 21, which simplifies to 34.

Answer:

The Population Density is [tex]500\ People/mi^2[/tex].

Step-by-step explanation:

Given,

Total number of People = 900,000

Total Land Area = 1800 sq. mi.

Solution,

For calculating the population density, we have to divide the total number of people by the area of the land.

This can be framed in equation form'

[tex]Population\ Density=\frac{Total\ Number\ of\ People}{Land\ Area}[/tex]

Now putting the given values, we get;

[tex]Population\ Density=\frac{900,000}{1800\ mi^2}=500\ People/mi^2[/tex]

Hence The Population Density is [tex]500\ People/mi^2[/tex].

Final answer:

The solution to the algebraic equation 6x = 322 is found by dividing both sides by 6, which results in x ≈ 53.67.

Explanation:

The value of x that makes the equation 6x = 322 true can be found by performing simple algebra. In order to solve for x, you need to isolate it on one side of the equation.

Here are the steps:

Therefore, the value of x that satisfies the equation is approximately 53.67.

The function which is created by shifting the graph of function f up 5 units is  [tex]f(x)=4^x-1[/tex]

So, Option A is correct.

Step-by-step explanation:

We are given function: [tex]f(x)=4^x-6[/tex]

We need to determine the function which is created by shifting the graph of function f up 5 units.

The translation is vertical

If g(x)=f(x)+h then the graph is shifted up h units.

So, Applying translation:

[tex]f(x)=4^x-6[/tex]

[tex]g(x)=(4^x-6)+5[/tex]

Simplifying:

[tex]f(x)=4^x-6+5[/tex]

[tex]f(x)=4^x-1[/tex]

The function which is created by shifting the graph of function f up 5 units is  [tex]f(x)=4^x-1[/tex]

So, Option A is correct.

Keywords: Transformation

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Answer:

1:2

Step-by-step explanation:

Find the ratio of the ratio of the number of minutes he lifted weights to the total number of minutes of his entire workout and simplify it

25:10+25+15

25:50

1:2

Answer:

1 to 2

1:2

1/2

Step-by-step explanation:

Ratios can be written in three forms:

A to B

A:B

A/B

Ratios are also simplified by reducing to lowest terms like fractions are.

This problem's ratio is:

minutes lifted weights to total minutes workout

The number of minutes lifting weights is in the question: 25.

To find the total minutes of his workout, add the number of minutes he spent for all of the activities:

Total minutes = warm-up + lifting weights + treadmill

Total minutes = 10 + 25 + 15

Total minutes = 50

The ratio before simplifying is 25/50.

This ratio can be reduced to lowest terms. Both sides are divisible by 25.

25/25 = 1

50/25 = 2

The ratio in lowest terms is 1/2.

It can also be written as 1 to 2 or 1:2.

Hope it helps u............

The cost of package is $14.20

Step-by-step explanation:

Given,

Cost per pound of groundless beef = $5.99

Weight of package bought = 2.37 lbs

Cost of package = Cost per pound of beef * Weight of package

Cost of package = 5.99 * 2.37

Cost of package = $14.1963

Rounding off to nearest cent

Cost of package = $14.20

The cost of package is $14.20

Keywords: multiplication

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The cost per ticket is $0.75 if Clayton purchases the package.

Step-by-step explanation:

Given,

Cost of package = $18.75

Tickets in package = 25 tickets

To determine the cost of one ticket, we will divide the cost of package with number of tickets in package.

Cost per ticket = [tex]\frac{18.75}{25}[/tex]

Cost per ticket = $0.75

The cost per ticket is $0.75 if Clayton purchases the package.

Keywords: division, unit rate

Learn more about division at:

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56/84 or 2/3

Hope this helped!

Answer:

56/84

Step-by-step explanation:

Adam had 84 questions, and out of 84, he got 56 right.

Out of  just indicates a fraction.

You would then translate:

x/84

If x is how many he got right, you would then substitute in 56:

56/84

:)

Answer:

The quantity of cherries bought is 1.67 lb

The quantity of grapes bought is 3.33 lb

Step-by-step explanation:

Given as :

The cost of cherries = $4 per lb

The cost of grapes = $2.50 per lb

Total money spend on fruits = $15

The quantity of both fruits to bought = 5  lb

Let The quantity of cherries bought = c  lb

Let The quantity of grapes bought = g    lb

Now, According to question

quantity of both fruits to bought = quantity of cherries bought + quantity of grapes bought

i.e c + g = 5 lb              ........1

And

Total money spend on fruits = cost of cherries × quantity of cherries bought + cost of grapes × quantity of grapes bought

Or , c   lb ×  $4 per lb +  g  lb  ×  $2.50 per lb = $15

Or, 4 c + 2.50 g = 15           .......2

Now, Solving equation 1 and 2

So, (4 c + 2.50 g) - 2.50 × (c + g) = 15 - 5 × 2.50

Or, (4 c - 2.50 c) + (2.50 g - 2.50 g) = 15 - 12.50

Or, 1.5 c + 0 = 2.5

∴ c = [tex]\dfrac{2.5}{1.5}[/tex]

I.e c = 1.67  lb

So, The quantity of cherries bought = c  = 1.67 lb

Putting the value of c in eq 1

Since , c + g = 5  lb

Or, g = 5  lb - c

Or, g = 5  lb - 1.67  lb

i.e  g = 3.33  lb

So, The quantity of grapes bought = g  = 3.33 lb

Hence, The quantity of cherries bought is 1.67 lb

and The quantity of grapes bought is 3.33 lb   Answer

Answer:

The value of a = ±(√3)/(6)

Step-by-step explanation:

Points A and D belong to the x−axis.

All vertices on the parabola y = a (x+1)(x−5) = a (x² - 4x - 5)

So, points A and D represents the x-intercept of the parabola y

To find x-intercept, put y = 0

∴ a (x+1)(x−5) = 0  ⇒ divide both sides by a

∴ (x+1)(x−5) = 0 ⇒ x = -1 or x = 5

so, the x-coordinate of Point A is -1 or 5

And given that: m∠BAD=60°

So, the tangential line of the parabola at point A has a slope of 60°

∴ y' = tan 60° = √3

∴ y' = a (2x-4)

∴ a (2x-4) = √3

∴ a = (√3)/(2x-4)

Substitute with x = -1 ⇒ a = (√3)/(-6)

Substitute with x = 5 ⇒ a = (√3)/(6)

So, The value of a = ±(√3)/(6)

Also, see the attached figure, it represents the problem in case of a = (√3)/(-6)

Answer:

Step-by-step explanation:

[tex]a=+(3+9\sqrt{3})/52\\ a=-(3+9\sqrt{3})/52\\[/tex]

Answer:

70

Step-by-step explanation:

We can rewrite the phrase for every '1 red light there are 9 blue lights' as there are 9 blue lights for every red, which may make it slightly clearer.

If there are 7 red lights, and 9 blues for every red, then there are 7*9 blue lights, or 63 blue lights. Now we can add the red and blue lights; 63+7=70, so there are 70 lights in all.

Answer:

70

Step-by-step explanation:

Answer:

1. See the graph attached

2. 13,400 thousands people will attend the new movie on the 8th day, if the pattern shown in the graph continues.

Explanation:

The table that shows the number of people who attend a new movie ofver teh course of a week is:

Day   Attendance (thousands)

1          12,200

3         12,600

5         13,000

7         13,400

8              x

The graph showing that pattern is attached.

It is a discrete graph because days can take only positive integer values.

You can see that the relation is linear and can calculate the change in the number of people every two days by subracting any two consecutive pairs of data:

Hence, every two days the increase in the number of people is 400 thousands.

For one day the increase is: 400 thousands / 2 days = 200 thousands/day.

Since you know the attendance for the day 7, you can calculate the attendance for the day 8 adding 200 thousands to 13,400:

Answer with Step-by-step explanation:

Jamel' spend on apples

= Jamel' spend on Green apples + on Red apples

= Cost per pound of apples *( Pounds of green apples + Pounds of red apples)

= 1.65*(2+3.2)

= 1.65*5.2

= $8.58

Answer: $8.58 is Jamel' total spend on apples.

Answer

Tina is 21, t-3

Step-by-step explanation:

Cole is 18, we don't really need that so just ignore it. Cole is 3 years younger than Tina. Therefore T which is Tina's age, minus 3 would equal Cole's age of 18.

Answer:

a

Step-by-step explanation:

Lets turn E into x and F into y.

We already know that x is 0.8. And if y/x = 0.6, we have to figure that out.

y/x = 0.6

y/0.8 = 0.6

Multiply by 8 to get y = 0.48.

So we have to find P(xy)

So if we know that x = 0.8 and y = 0.48 then all we have to do is multiply 0.48 and 0.8.

0.48 * 0.8 = 0.384

P(E and F) is 0.384.

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Answer: 12 1/3

Step-by-step explanation:

First, you need to add up 11/4 and

6 1/2

11/ 4 + 6 1/2 = 11/4 + 13/2 = 37 / 4

To find how many 3/4 we have in 37/4, we simply dividw 37/4 by 3/4

37/4 ÷ 3/4

= 37/4 × 4/3 (4 will cancel out 4)

= 37/3

=12 1/3

The number of groups of 3/4 that are in 11/4 and 6 1/2 is 3 2/3 and 8 2/3 respectively.

= 11/4 ÷ 3/4

= 11/4 × 4/3

= 11/3

= 3 2/3

= 6 1/2 ÷ 3/4

= 13/2 ÷ 3/4

= 13/2 × 4/3

= 8 2/3

Therefore, the number of groups of 3/4 that are in 11/4 and 6 1/2 are 3 2/3 and 8 2/3 respectively.

Read related link on:

https://brainly.com/question/14297045

Answer:

x = y

Step-by-step explanation:

7x = 5y + 2x

Subtract 2x from both sides

5x = 5y

x = y

The expression [tex]\((-4x^2ya^3)^2\)[/tex] written as a monomial in standard form is [tex]\(16x^4y^2a^6\)[/tex].

To write the expression [tex]\((-4x^2ya^3)^2\)[/tex] as a monomial in standard form, you need to apply the exponent to each term inside the parentheses.

Remember that when raising a power to another power, you multiply the exponents.

[tex]\((-4x^2ya^3)^2\)[/tex] means you square each term inside:

[tex]\[ (-4)^2 \cdot (x^2)^2 \cdot (y)^2 \cdot (a^3)^2 \][/tex]

Now, perform the operations:

[tex]\[ 16 \cdot x^{2 \cdot 2} \cdot y^{2 \cdot 1} \cdot a^{3 \cdot 2} \][/tex]

Simplify the exponents:

[tex]\[ 16 \cdot x^4 \cdot y^2 \cdot a^6 \][/tex]

So, [tex]\((-4x^2ya^3)^2\)[/tex] written as a monomial in standard form is [tex]\(16x^4y^2a^6\)[/tex].

for a³, when squared, it becomes [tex]a^(3*2) = a^6.[/tex] Thus, the simplified expression is [tex]16x^4y^2a^6[/tex]

To simplify the expression[tex](-4x^2ya^3)^2[/tex], apply the power rule, squaring each term within the parentheses. First, square the coefficients: (-4)² = 16. Then, square the variables inside the parentheses. For x², when raised to the power of 2, it becomes[tex]x^(2*2) = x^4.[/tex] For y^1, when squared, it becomes [tex]y^(1*2) = y^2[/tex]. Finally, for [tex]a^3,[/tex] when squared, it becomes a^(3*2) = a^6. Thus, the simplified expression is [tex]16x^4y^2a^6[/tex]

To simplify the expression[tex](-4x^2ya^3)^2,[/tex]start by understanding the exponent rule when raising a power to another power. Applying this rule, square the entire expression inside the parentheses:[tex](-4x^2ya^3)^2.[/tex]Begin by squaring the coefficient[tex](-4)^2,[/tex] resulting in 16. Then, square each variable term. For[tex]x^2,[/tex] when squared, it becomes[tex]x^(2*2) = x^4.[/tex]The y term, which is effectively[tex]y^1,[/tex]squared yields[tex]y^(1*2) = y^2.[/tex]Lastly, a^3, when squared, becomes [tex]a^(3*2) = a^6.[/tex]Therefore, combining the simplified coefficients and variables, the final answer is[tex]16x^4y^2a^6.[/tex]

HOPE IT HELPS U.............

The domain of a relation is the set of all the x-terms of the relation.

Let's look at an example.

In the image provided I have attached a relation and we want to list the domain.

So, I will list all the x-terms. Notice however that I listed 7 once even though it appears twice in the relation. When listing the domain, you don't repeat the x-terms.

Answer: 30m - 7

Step-by-step explanation:

combine the two m's (:

Answer:

30m-7

Step-by-step explanation:

18m-7+12m=30m-7

Answer:

[tex](-4,32)[/tex]

Step-by-step explanation:

Given points are [tex](-1,-8)[/tex]

And given transformation is [tex]D_4[/tex] [tex]r_{x-axis}[/tex]

We will start from left to right.

First transformation is reflection about x-axis.

When we reflect about x-axis [tex](x,y)\ became\ (x,-y)[/tex]

So, [tex](-1,-8)=[-1,-(-8)]=(-1,8)[/tex]

Now next transformation is dilation with a factor 4.

If we do dilation with a factor [tex]'k'[/tex] to the point [tex](x,y)[/tex]

New co-ordinates after dilation became [tex](kx,ky)[/tex]

So, [tex](-1,8)\ became\ (-4,32)[/tex]

Answer:

3/10, 3:10

Step-by-step explanation:

3 to 10 : 3/10, 3:10

The point (3, 2) is the solution to given system of equations

Solution:

Given that system of equations are:

[tex]x^2 + y^2 = 13[/tex]    ------ eqn 1

[tex]2x - y = 4[/tex]    ------- eqn 2

From eqn 2,

y = 2x - 4

Substitute y = 2x - 4 in eqn 1

[tex]x^2 + (2x - 4)^2 = 13\\\\x^2 + 4x^2 + 16 - 16x = 13\\\\5x^2 -16x + 3 = 0[/tex]

Let us solve the above equation by quadratic formula,

[tex]\text {For a quadratic equation } a x^{2}+b x+c=0, \text { where } a \neq 0\\\\x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}[/tex]

Using the Quadratic Formula for [tex]5x^2 -16x + 3 = 0[/tex] where  a = 5, b = -16, and c = 3

[tex]\begin{aligned}&x=\frac{-(-16) \pm \sqrt{(-16)^{2}-4(5)(3)}}{2 \times 5}\\\\&x=\frac{16 \pm \sqrt{256-60}}{10}\\\\&x=\frac{16 \pm \sqrt{196}}{10}\end{aligned}[/tex]

The discriminant [tex]b^2 - 4ac>0[/tex] so, there are two real roots.

[tex]\begin{aligned}&x=\frac{16 \pm \sqrt{196}}{10}=\frac{16 \pm 14}{10}\\\\&x=\frac{16+14}{10} \text { or } \frac{16-14}{10}\\\\&x=\frac{30}{10} \text { or } x=\frac{2}{10}\\\\&x=3 \text { or } x=0.2\end{aligned}[/tex]

Substitute for x = 0.2 and x = 3 in 2x - y = 4

when x = 3

2(3) - y = 4

6 - y = 4

y = 2

when x = 0.2

2(0.2) - y = 4

0.4 - y = 4

y = 0.4 - 4

y = -3.6

Thus Option D is correct The point is (3, 2)

The number of hours the diesel train traveled  before the cattle train caught up is 15 hours

Solution:

Let t = travel time of the diesel train

Then  (t - 2) is the travel time of the cattle train (Left 2 hrs later)

Average speed of diesel train = 52 mph

Average speed of cattle train = 60 mph

To find: number of hours the diesel train traveled  before the cattle train caught up

Distance = speed x time

Distance traveled by diesel train:

Distance = 52 x t = 52t

Distance traveled by cattle train:

Distance = 60 x (t - 2) = 60t - 120

When the cattle train catches the diesel, they will have traveled the

same distance

Distance traveled by diesel train = Distance traveled by cattle train

52t = 60t - 120

60t - 52t = 120

8t = 120

t = 15

Thus the number of hours the diesel train traveled  before the cattle train caught up is 15 hours

Answer: t = 6

Step-by-step explanation: First we solve for -9(t-2) and that comes out to be -9t + 18. Then we solve for 4(t-15) which comes out to be 4t - 60. So the new equation we have is -9t + 18 = 4t - 60. In order to solve for t, we need to get t on one side of the problem by itself. To do this we will first add 9t to both sides and it comes out to be 18 = 13t - 60. t is still not by itself so now we add 60 to both sides and that gives us 78 = 13t. t is still not by itself so now we need to divide each side by 13 so that variable t is by itself. When we divide both sides by 13 we get 6 = t.

Answer:

6

Step-by-step explanation:

-9t + 18 = 4(t-15)

-9 +18 = 4t - 60

-9t = 4t-60-18

-9t = 4t - 78

-9 - 4 = -78

-13 = -78t =

t = -78/-13

t = 6

The required equations that represent the sum and difference of numbers are: x + y = 77 and [tex]\frac{x}{2} - \frac{y}{3} = 6[/tex]

Solution:

Let the two consecutive numbers be "x" and "y"

Where "x" is the smaller number and "y" is the larger number

Given that sum of two consecutive numbers is 77

Therefore we frame a equation as:

x + y = 77

Also given that The difference of half of the smaller number and one-third of the larger number is 6

Therefore we frame a equation as:

half of the smaller number - one-third of the larger number = 6

half of x - one third of y = 6

[tex]\frac{1}{2}x - \frac{1}{3}y = 6\\\\\frac{x}{2} - \frac{y}{3} = 6[/tex]

Therefore the required equations that represent the sum and difference of numbers are:

x + y = 77

[tex]\frac{x}{2} - \frac{y}{3} = 6[/tex]

Answer:

$52.5 saved. And he paid $297.50

Step-by-step explanation:

First finding the amount of money of the 15% discount

350.00 × .15 = $52.5

Then the the original price minus the dicount

350.00 - 52.50 = $297.50

Answer:

he saved 52.5$

Step-by-step explanation:

350.00*15/100

=52.5

Solving the inequality [tex]7x-25<-39[/tex] we get [tex]x<-2[/tex]

Step-by-step explanation:

We need to solve 25 subtracted from the product of a number and 7 is less than -39

Translating into mathematical form

Let the number be x

[tex]7x-25<-39[/tex]

Solving the inequality to find the value of x

[tex]7x-25<-39[/tex]

Adding 25 on both sides

[tex]7x-25+25<-39+25[/tex]

[tex]7x<-14[/tex]

Divide both sides by 7

[tex]x<-2[/tex]

Solving the inequality [tex]7x-25<-39[/tex] we get [tex]x<-2[/tex]

Keywords: Solving inequalities

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The inequality representing the scenario '25 subtracted from the product of a number and 7 is less than -39' is solved by first setting up the inequality 7x - 25 < -39, then isolating x to find x < -2. Here, x represents the unknown number.

The student's question involves writing an inequality to represent the given scenario: 25 subtracted from the product of a number and 7 is less than -39. To express this in mathematical terms, let's denote the unknown number as x. The product of this number and 7 is written as 7x. Now, according to the question, when you subtract 25 from this product, the result should be less than -39.

So, the inequality becomes: 7x - 25 < -39. To solve this inequality, you would add 25 to both sides, resulting in 7x < -14. Then, dividing both sides by 7 gives us x < -2. This means that for the inequality to be true, the unknown number x must be less than -2.