Confused on Math
Solve the Systems
x+2y+2z=-2
2x-y-2z=-5
x+2y+4z=0
x=?
y=?
z=?

Answer:

  x = 0; y = -6; z = 1

Step-by-step explanation:

You want to find the solution to the system of equations ...

This set of equations is conveniently solved using the matrix row-reduction features of a scientific or graphing calculator, spreadsheet, or any of a number of apps or on-line calculators.

The attachment shows the solution to be ...

  (x, y, z) = (0, -6, 1)

__

Additional comment

Solving a system of three or more equations "by hand" often can be done by an ad hoc process. It can be done in systematic fashion using Gauss-Jordan reduction techniques, but that often gets messy. Similarly, Cramer's Rule can be used, but that math tends to involve more arithmetic operations than are really necessary.

Adding the first equation to the other two eliminates the y-variable and reduces the system to two equations in two unknowns.

  (9x +y -3z) +(10x -y +2z) = (-9) +(8) . . . . adding [1] and [2]

  19x -z = -1 . . . . simplified

  (9x +y -3z) +(-10x -y +4z) = (-9) +(10) . . . . adding [1] and [3]

  -x +z = 1 . . . . simplified

At this point, we could graph the two equations, or we can proceed algebraically.

Adding these two equations gives ...

  (19x -z) +(-x +z) = (-1) +(1)

  18x = 0   ⇒   x = 0

Using the second of the reduced equations, we find ...

 -x +z = 1

  0 +z = 1   ⇒   z = 1

And using the second of the original equations, gives us ...

  10(0) -y +2(1) = 8

  -y = 6 . . . . . subtract 2

  y = -6 . . . . multiply by -1

Then the solution is (x, y, z) = (0, -6, 1), as above.

Answer:

A and D

Step-by-step explanation:

[tex]\sf \boxed{\text{\bf Volume of rectangular box = length * width * height}}[/tex]

A) Volume of the given box = 6 * 3 * 5

                                             = 90 cubic meters.

D) Volume of the given box = 3 * 2 * 15

                                             = 90 cubic meters

Answer:

The function has a minimum of -1 at x = 3

The function is increasing on the interval: (3,∞)

The function is decreasing on the interval (-∞,3)

Step-by-step explanation:

Since our parabola opens upwards on the graph, the function has a minimum.

The minimum is the lowest x-value and y-value in the function.

From left to right, the function is moving downwards (decreasing) from x = -∞ to x = 3.

From left to right, the function is moving upwards (increasing) from x = 3 to x = ∞

Answer:

Step-by-step explanation:

9 ( 3 + 4) - 8 / 4 =

( use BIDMAS)

first step is brackets:

9 (7) - 8 / 4 =

next step is division:

63 - (8 / 4) =

63 - 2 = 61

hope that helps :)

Answer:

35

Step-by-step explanation:

thx for the pionts loolllll

The number of 4-fluidounce bottles that should be dispensed to meet the dosing requirements for the treatment of oropharyngeal candidiasis is 37.5 bottles.

To determine the number of 4-fluidounce bottles, we apply mathematical operations of addition, subtraction, division, and multiplication.

First, the total dosage is determined as 1,500 mg.

Since 40 mg/mL is available in 4-fluidounce bottles, the total dosage is divided by 40 mg/mL to determine the number of bottles required.

Dose of posaconazole for the first day = 100 mg twice

= 200 mg (100 mg x 2)

The total number of days for the dosage = 14

Dose for next 13 days = 1,300 mg (100 mg x 13)

Total dosage = 1,500 mg (200 mg + 1,300 mg)

40 mg/mL = 4-fluidounce bottle

1,500 mg = 37.5 bottles (1,500/40)

Thus, the number of 4-fluidounce bottles is 37.5 bottles.

Learn more about mathematical operations at https://brainly.com/question/20628271

#SPJ1

Answer:

  70 ft

Step-by-step explanation:

You want the actual width of a gym that is represented as 7 inches on a drawing with a scale of 1 in : 10 ft.

Each inch represents 10 feet, so 7 inches will represent ...

  7 × 10 ft = 70 ft

The gym is 70 ft wide.

__

Additional comment

You can also write and solve an equation that shows the measures are proportional:

  actual width / drawing width = (10 ft) / (1 in) = (gym width) / (7 in)

Multiplying both sides of this proportion by 7 in, we have ...

  gym width = (7 in) × (10 ft)/(1 in) = 7 × 10 ft = 70 ft

The answer will be 0. 10 >  0. 01 . Option B

Given the values as;

Turn the values into proper fractions

a. 0. 10 = 10/ 100

Reduce to simpler terms

= 10/ 100

= 1/ 10

b. 0. 01 = 1/ 100

a = 1/ 100

b = 1/ 100

This means that both decimals are not of  equal proportion and thus a is greater than (>) b

Thus, the answer will be 0. 10 >  0. 01 . Option B

Learn more about decimals here:

https://brainly.com/question/1827193

#SPJ1

Answer:

Hello,

a=3

Step-by-step explanation:

Since the middle term is x^3y^3 ==> n=6

Coefficient of  x^3y^3 is 20 (triangle de Pascal)

So a^6= 14580/20=729 ==> a=3

By doing some changes of units, we can see that we will need 22.61 gallons of paint to cover 800 square meters.

We know that with one liter of interior paint we can cover 100 square feet.

Remember the relation between square feet and square meeters:

1ft^2 = 0.092 m^2

Then with one liter we can cover:

100ft^2 = 100*0.092 m^2 = 9.2 m^2

So the number of liters of paint that we need to cover the 800 m^2 is given by the quotient:

L = 800m^2/9.2m^2 = 86.96

We need 86.96 liters of paint, and the relation between liters and gallons is:

1 L = 0.26 gal

Then we need:

86.96 L = 86.96*(0.26 gal) = 22.61 gal

We will need 22.61 gallons of paint to cover 800 square meters.

Learn more about changes of units:

https://brainly.com/question/141163

#SPJ1

Answer:-26

Step-by-step explanation:

Answer:-14-12=-26

Step-by-step explanation: PEMDAS. You do the first parentheses which is 7-21, which will get you -14. Then you do the second parentheses, 4+8. That will get you 12. Then since there’s no multiplication/division, you go to addition/subtraction and since there’s a subtraction symbol in between the parentheses, that’s what you do. -14-12 which will get you -26.

Hope this helps!

Btw PEMDAS stands for (for those people who don’t know or don’t remember)

Parentheses

Exponents

Multiplication*

Division*

Addition’

Subtraction’

*do both together, whichever one comes first when reading it

’do both together, whichever one comes first when reading it

We can't find dimension of the painting because length of painting is imaginary form.

Six rectangles make up a cuboid, each of which is referred to as a face. The cuboid's six faces are denoted by the letters ABFE, DAEH, DCGH, CBFG, ABCD, and EFGH in the previous diagram.

A pair of opposing faces is formed by the top face ABCD and the bottom face EFGH. The opposing faces ABFE, DCGH, and DAEH, CBFG, have similar pairings. Adjacent faces are any two faces that are not opposite faces.

Consider the faces ABCD, ABFE, BCGF, CDHG, and ADHE that are close by.

The width of painting = x- 24

the length of painting = x

according to question  

area of painting = 4081 [tex]cm^{2}[/tex]

i.e. [tex]x * (x - 24) = 4081[/tex]

[tex]x^{2} -24x-4081 = 0[/tex]

applying shridharacharya formula  :

 [tex]x = (-b ± √(b2 - 4ac)) / 2a.[/tex]

it has imaginary roots !!!

Roots: -12 + 62.745517768204i, -12 - 62.745517768204i

Root Pair: -12 ± √(3937)i

Factored: f(x) = (x + 12 + 62.745517768204i)(x + 12 - 62.745517768204i)

Discriminant: -15748

Vertex: (-12, 3937)

Sum of Roots (-b/a): -24

Product of Roots (c/a): 4081

∴ We can't find dimension of the painting because length of painting is imaginary form.

learn more about cuboidal object here :

brainly.com/question/19754639

#SPJ9

If one fifth times w equals negative one eight then w = -5/8

What is Rational numbers?

A rational number is any number that can be written as a fraction, where both the numerator (the top number) and the denominator (the bottom number) are integers, and the denominator is not equal to zero. In other words, a rational number can be expressed as p/q, where p and q are both integers and q ≠ 0.

given that one fifth times w equals negative one eight

we have to find the value of w

one fifth = 1/5

one fifth times w = (1/5)* w

negative one eighth = - 1/8

now according to the question

one fifth times w equals negative one eight

(1/5) *w =  -1/8

now solve the equation , we get

w= (5) * (-1/8)

  = -5/8

Hence ,if  one fifth times w equals negative one eight then w = -5/8

learn more about of fraction here

https://brainly.com/question/10354322

#SPJ9

Answer:

y = -34x - 270

Step-by-step explanation:

m = -34, y = 2, x = -8

y = mx + b

2 = -34(-8) + b

b = 2 - 272

b = -270

y = -34x - 270

Answer:

I think 3.

Step-by-step explanation:

3*4=12 near 10

8 x 10^16/4 x 10^11

do exponents first

8 x 10,000,000,000,000,000/4 x 100,000,000,000

than multiply

80,000,000,000,000,000/4 x 100,000,000,000

than divide

20,000,000,000,000,000x 100,000,000,000

2,000,000,000,000,000,000,000,000,000

Answer:

40

Step-by-step explanation:

=125x32

=4,000÷100

=40

Answer:

Step-by-step explanation:

400

30

1

400 FOR HUNDREDS

Answer: 36

Step-by-step explanation:

Median of an even number data set, you would add the two middle numbers divided by 2. Answer is 36. See attached solution

Answer: x = 4

Step-by-step explanation:

   Given:

3x - 1 = 11

   Add 1 to both sides of the equation:

3x = 12

   Divide both sides of the equation by 3:

x = 4

The correct option is option B) which is that the statement is true for all real numbers.

According to the question we have been given the inequality equation as

             |2s-7| ≥ -1

We know that for b<0,

         if |a| ≥ b then all real numbers.

Here we have been given,

           |a| = |2s-7|

            b = -1 <0

As it is fulfilling the above condition and also all the absolute values are non-negative. Therefore the statement is true for all real numbers.

Hence the solution of the  |2s-7| ≥ -1 is true for all real numbers that is option B) is the correct option.

Learn more about inequalities here : https://brainly.com/question/24372553

#SPJ9

Equation of the line with slope -1/2 passing through the point (-1,-4) is x + 2y = -9

Given,

the slope of the line = -1/2

the line passes through the point (-1,-4)

=> s = -1 and t = -4

The following equation can be used to find the line's equation:

( y - t ) = slope ( x - s )

We get by substituting the values in the equation

=> y + 4 = - 1/2 * ( x + 1 )

=> x + 2y = -1 - 8

=> x + 2y = -9

Therefore, by using the formula for equation of line, we get the equation of the line with slope -1/2 passing through the point (-1,-4) as x + 2y = -9

Learn more about Equation of Line here:

https://brainly.com/question/17947737

#SPJ9

The water that a bobcat drink in 1 day will be 3x.

Let the amount of water be represented by x.

From the information, it was stated that each day a bobcat drinks about 3 times as much water as a canada goose drinks.

Let the water that the Canada goose drank be represented as x

Therefore, the water that a bobcat drink in 1 day will be 3x.

Learn more about expressions on:

brainly.com/question/22048677

#SPJ1

Answer:

17

Step-by-step explanation:

We can substitute x = -4 and y = 1 since the point lies on the line.

[tex]5(-4)-3(1)=B \\ \\ B=17[/tex]

Answer:

  26.0 cm

Step-by-step explanation:

Given quadrilateral ABCD with diagonal BD forming triangles ABD and BCD, and angles A=90°, C=52°, ADB=35°, and CBD=52°, you want the length of CD to 3 significant figures.

The law of sines tells you the relation between sides and opposite angles is ...

  a/sin(A) = b/sin(B) = c/sin(C)

This lets us write two proportions that can be solved for the measure of CD.

In triangle ABD:

  BD/sin(A) = AB/sin(D)

  BD = AB·sin(90°)/sin(35°) = 12 cm/sin(35°) ≈ 20.921 cm

In triangle BCD:

  CD/sin(B) = BD/sin(C)

  CD = BD·sin(B)/sin(C) = 20.921 cm·sin(102°)/sin(52°) ≈ 25.969 cm

The length of CD is about 26.0 cm.

The value of the composite function (mn)(-3) is 9

The given parameters are:

m(x) = x

n(x) = -3

The composite function is given as

(mn)(x)

The above composite function is calculated as

(mn)(x) = m(x) * n(x)

Substitute -3 for x in the above function

So, the above function becomes

(mn)(-3) = m(-3) * n(-3)

So, the above function becomes

(mn)(-3) = -3 *-3

Evaluate the product in the above equation

So, we have

(mn)(-3) = 9

Hence, the value of the composite function (mn)(-3) is 9

Read more about composite function at

https://brainly.com/question/10687170

#SPJ1

Complete question

If m(x) = x and n(x) = -3, calculate ( m n ) (x) for x = −3

Answer: 0.17

Step-by-step explanation:

Plug the equation into a calculator (17 divided by 100).

You can also think of the problem like this; move both decimal places to the left twice since, in 100, there are two 0's.

17 -> 0.17

100 -> 1

This can also work with 17 and 1000, but you would have to move the decimal place three times.

17 -> 0.017

1000 -> 1

I think you are supposed to add the the numbers in that row and if it's more that 18 and less that 37 that's the answer. exapmle:

2,8,3,9,5

Add those together and get 27. 27 is less than 37 and more that 18 so it would be one of the answers.

I could be wrong but I'm pretty sure that is what you do

Answer:

true

Step-by-step explanation:

Answer: true

step by step explanation:

The amount invested in the account that paid 4% interest is $2,600

The amount invested in the account that paid 13% interest is $1,500.

a + b = 4100 equation 1

0.04a + 0.13b = 299 equation 2

Where:

a = amount invested in the account that paid 4% interest

b = amount invested in the account that paid 13% interest

The first step is to multiply equation 1 by 0,04

0.04a + 0.04b  = 164 equation 3

Subtract equation 3 from equation 2

0.09b = 135

b = 135 / 0.09

b = $1500

a = 4100 - 1500 = $2,600

To learn more about simultaneous equations, please check: https://brainly.com/question/25875552

#SPJ1