I need help with this problem. Can anyone help?

Answer:

A

Step-by-step explanation:

y = -9 ------(1)

9x -4y = -9 -------(2)

substitute (1) into (2)

9x - 4 (-9) = -9

9x = - 45

x = -5

there you go, x = -5 and y = -9

so. (-5 , -9 )

hope this helps

please mark it brainliest

Answer:

Step-by-step explanation:

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Answer:

3 - x ≥ 15

Step-by-step explanation:

3 - x ≥ 15

Answer:

1.344

Step-by-step explanation:

Given that:

n=49,σ = 4.8

Zcritical = 95%

Using the relation :

Margin of Error = Zcritical * sqrt(σ² / n)

Zcritical at 95% = 1.96

Margin of Error = 1.96 * sqrt(4.8² / 49)

Margin of Error = 1.96 * (4.8 / 7)

Margin of Error = 1.96 * 0.6857142

Margin of Error = 1.344

Answer:

D:30

Step-by-step explanation:

Total of students =53

53-7= 46

46÷2=23

23+7=30

Answer:

maybe get help from your teacher

Answer:

C) The graph opens down and the vertex is a maximum.

Step-by-step explanation:

Just took the quiz on K12, good luck! :)

Option (C) will be the correct option.

         f(x) = ax² + bx + c

         Vertex of the parabola is represented by [tex][-\frac{b}{2a}, f(\frac{b}{2a})][/tex]

         And the sign of the leading coefficient decides the opening of the

         parabola.

         For positive sign of 'a' → Parabola will open upwards

         For negative sign of 'a' → Parabola opens downwards

Quadratic function given in the question is,

f(x) = -4x²+ 6x - 7

Leading coefficient → (-4)

Negative sign represents the opening of the parabola downwards.

And the vertex will be a maximum.

           Therefore, Option (C) will be the correct option.

Learn more about the quadratic function here,

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Answer:

The average rate of change over the given interval is 12

Step-by-step explanation:

Here, we want to calculate the average rate of change over the given interval

Mathematically, we can calculate the average rate of change using the formula below;

f(b) - f(a)/b-a

The f values are same as the y values

Thus, we have it that;

a = 1 and b = 3

f(a) = -5 and f(b) = 19

The average rate of change is thus;

(19-(-5))/(3-1) = 24/2 = 12

Answer:

x=9

Step-by-step explanation:

12+12x=3+13x then simplify

Answer:

20. 1/2 and 5/7 so the chance would be 5/14 or 20.83

19. 5/7 and 1/2 so it's 5/14 or 20.83 again

18. 2/7 and 11/1 so it's a 22/7 chance or 3.14

Answer:

26.69

Step-by-step explanation:

The question lacks the required diagram. Find the diagram attached

The missing side is x;

From the triangle we are given;

Opposite = x

Hypotenuse = 29

Angle of elevation = 67 degrees

Using the SOH CAH TOA identity;

Sin theta = opposite/hypotenuse;

sin 67 = x/29

x = 29sin67

x = 29(0.9205)

x = 26.69

Hence the length of the missing side is 26.69

All trigonometric ratios of triangle PQR were calculated.

In the given right triangle PQR

PR = 14

QR = 50

So, using Pythagoras' theorem

PQ = 48

Sine of an angle = Opposite side / Hypotenuse

cosine of an angle = Adjacent side/ Hypotenuse

Tangent of an angle = Opposite side/ Adjacent side

So, SinQ = 14/50 =7/25      

CosecQ = 1/SinQ = 25/7

CosQ= 48/50 = 24/25

SecQ = 1/CosQ = 25/24

TanQ = 14/48 = 7/24

CotQ = 1/tanQ = 24/7

SinR=24/25

CosecR = 1/SinR= 25/24

CosR=7/25

SecR = 1/Cosr = 25/7

TanR =24/7

CotR = 1/tanR = 7/24

Thus, All trigonometric ratios of triangle PQR were calculated.

To get more about trigonometric ratios visit:

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Answer:

1.641× 10^-3 pounds/ cubic inch

Step-by-step explanation:

Density= mass / volume

Mass of the material= 9 kilograms

Volume= 7 cubic feet

Density= 9/7= 1.286 kg/ ft^3

Density= 1.286 kg/ ft^3

To Convert to pounds per inch

1 kg/ ft^3 = 0.00128 pound / cubic inch

1.286 kg/ ft^3 = X pounds/ cubic inch

X=( 1.286 × 0.00128)

= 0.0016407087 pounds/ cubic inch

= 1.641× 10^-3 pounds/ cubic inch

Hence,this density in pounds per inch is 1.641× 10^-3 pounds/ cubic inch

Answer:The reciprocal of 5/6 is found by switching the numerator for the denominator and the denominator for the numerator. That means that the reciprocal of 5/6 is 6/5.

Answer:

1.2

Step-by-step explanation:

that should be it the answer

Answer:

3/7 chance or a 42.8% chance

Step-by-step explanation:

Answer:

13

Step-by-step explanation:

Evaluate the expression for v = 2.

First, plug in 2 wherever v is seen.

5v + 3

5(2) + 3

Next, multiply.

5(2) + 3

10 + 3

Add.

10 + 3

13

Your final answer is 13.

Please let me know if there are any issues with this answer.

Answer:

i think this is algebra

Step-by-step explanation:

The first thing you have to do is open the multiplication parenthesis to substitute V for 2

5v + 3

5 (2) + 3

Now that you have the parenthesis, you multiply and then the result that you add.

5(2) or 5x2= 10 but is better with parenthesis.

10 + 3

=3

I hope this helps.

Answer:

I think it would be C

I'm not completely sure though!

Answer:

Step-by-step explanation:

Exterior angle is equal to sum of non-adjacent interior angles:

Correct choice is D. 85

Answer:

d

Step-by-step explanation:

Answer:

235.5

Step-by-step explanation:

Volume of a cylinder is 3.14(or pi) times radius^2 (5) times the height (3)

3.14 x 5^2 x 3

3.14 x 25 x 3 = 235.5

trust me

Answer:

Step-by-step explanation:

The scale factor is 2

Corresponding point on a unit circle is equal to [tex]\boldsymbol{\left [ \frac{-\sqrt{3}}{2},\frac{-1}{2} \right ]}[/tex]

So, option C. is correct.

A unit circle is a circle with radius is equal to one.

Any point on a unit circle is of the form [tex]\boldsymbol{\left ( cos\, \theta, \sin\, \theta \right )}[/tex]

Value of [tex]\theta[/tex] is [tex]\boldsymbol{\frac{7\pi}{6}}[/tex]

So, corresponding point on a unit circle is equal to [tex]\boldsymbol{\left [\cos \left (\frac{7\pi}{6} \right ),\sin \left (\frac{7\pi}{6} \right ) \right ]}[/tex]

[tex]\left [\cos \left (\frac{7\pi}{6} \right ),\sin \left (\frac{7\pi}{6} \right ) \right ]=\left [\cos \left (\pi + \frac{\pi}{6} \right ),\sin \left (\pi + \frac{\pi}{6} \right ) \right ][/tex]

                              [tex]=\left [ -cos\left ( \frac{\pi}{6} \right ),-\sin\left ( \frac{\pi}{6} \right ) \right ]\\=\boldsymbol{\left [ \frac{-\sqrt{3}}{2},\frac{-1}{2} \right ]}[/tex]

So, option C. is correct.

Find out more information about circle here:

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Answer:

377 is your answer

Step-by-step explanation:

75.4 x 5 there is your answer

Answer:

A

Step-by-step explanation:

Answer:

Its closer to B.

Step-by-step explanation:

19% is close to 20% which is 1/4 of 100%

Answer: x = 10

Step-by-step explanation: 4 times 250 is 1000 and divided by 100 is 10

Answer:

18

Step-by-step explanation:

8+10=18

hope this helps :)

Answer:

18

Step-by-step explanation:

10+8=18.

Answer:

5 + 2/3 = 5 remainder 6

Macie waters 5 plants. She uses [tex]\frac{2}{3}[/tex] cup of water for each plant. So, she uses 3.33 cups of water. This problem is based on the principle of multiplication.

The principle of multiplication states that a number when multiplied by another number results in a product of the two numbers. These two numbers on being multiplied give a unique number and that resultant number is said to be divisible by both numbers and their factors.

It is given that Macie waters 5 plants.

According to the question, she uses [tex]\frac{2}{3}[/tex] cup of water for each plant.

Total number of cups of water used by her [tex]= 5\times\frac{2}{3}[/tex]

                                                                        [tex]= \frac{10}{3}[/tex]

                                                                        [tex]= 3.33[/tex].

So, Macie uses 3.33 cups of water.

Learn more about Multiplication here:

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Answer:

Step-by-step explanation:

Answer:

kiloliter

Step-by-step explanation:

10 hectoliters fit in one kiloliter