PLEASE I NEED HELP ON THIS

Answer:

30

Step-by-step explanation:

Answer:

The equation of a quadratic function that contains the points (1, 21), (2,18) and (-1, 9) is [tex]y = -3\cdot x^{2}+6\cdot x +18[/tex].

Step-by-step explanation:

A quadratic function is a second order polynomial of the form:

[tex]y = a\cdot x^{2}+b\cdot x + c[/tex] (1)

Where:

[tex]x[/tex] - Independent variable.

[tex]y[/tex] - Dependent variable.

[tex]a[/tex], [tex]b[/tex], [tex]c[/tex] - Coefficients.

From Algebra we understand that a second order polynomial is determined by knowing three distinct points. If we know that [tex](x_{1}, y_{1}) = (1, 21)[/tex], [tex](x_{2},y_{2}) = (2,18)[/tex] and [tex](x_{3}, y_{3}) = (-1, 9)[/tex], then we construct the following system of linear equations:

[tex]a+b+c = 21[/tex] (2)

[tex]4\cdot a + 2\cdot b + c = 18[/tex] (3)

[tex]a - b + c = 9[/tex] (4)

By algebraic means, the solution of the system is:

[tex]a = -3[/tex], [tex]b = 6[/tex], [tex]c = 18[/tex]

Therefore, the equation of a quadratic function that contains the points (1, 21), (2,18) and (-1, 9) is [tex]y = -3\cdot x^{2}+6\cdot x +18[/tex].

Answer: 12 girls to 27 students

5 boys to 9 students

15 boys to 12 girls

HOPE THIS HELPS

CAN U PLEASE GIVE ME BRAINLIEST

Answer:

56ft2 in

Step-by-step explanation:

Answer:

the answer is D

Step-by-step explanation:

they divided

Answer:

It's actually B.

Step-by-step explanation:

Divide the numbers on the scale drawing by 3. 75 divided by 3 equals 25, 51 divided by 3 equals 17, 30 divided by 3 equals 10, and 72 divided by 3 equals 24. Letter B has all of those answers.

Answer:

Step-by-step explanation:

The area is the product of the length and width

Width = ?

The width is 2 3/20 m

Answer:

3/4 into decimal = 0.75

0.75 X 100 = 75

2 X 100 = 200

200/75 = 2.66666666

Answer:

about 4.52

Step-by-step explanation:

Since pi times radius squared is the formula for area, you would first divide 64 by 3.14 to get about 20.4. Then since you square the radius, you would do the opposite and find the square root which is about 4.52.

Answer:

The length of the longer side is 12 in

Step-by-step explanation:

Scaling

The dimensions of the photographic negative are 2 in by 1.5 in.

An enlarged print of it has a length of 9 in and it's equivalent to the shortest side.

Since the shortest side of the negative is 1.5 in, the scale factor is 9/1.5 = 6.

The longer side should have been enlarged by the same factor, thus the longer side is 2*6 = 12 in

The length of the longer side is 12 in

Answer: 16 1/15

23/3+42/5

115/15+126/15

241/15= 16 1/15

I hope this helps:

Answer:

16 1/15

Step-by-step explanation:

Add the whole numbers.  7+8=15

Now, combine the fractions 2/3 and 2/5. To do so, you need a common denominator. The LCD between 3 and 5 is 15.

Whatever you do to one side you must do to the other.

(5/5) 2/3+ 2/5 (3/3)

10/15+6/15=16/15

15+16/15

16/15 is an improper fraction, so convert this fraction to a mixed number.

16/15= 1 1/15

Finally, add the two together. 15+ 1 1/15=

16 1/15

Answer:

$2 per pound.

Step-by-step explanation:

No options are listed to your question. My best guess, depending on the typical length of TV shows, is the measurement of minutes!

Answer: Minutes can be used mostly in determining the duration for watching a TV show.

Step-by-step explanation:

Answer: Ella got the highest mark

Step-by-step explanation:

camilla got 160/200 because 200 divided by 5 = 40

lincoln got 88/200 because 44% of 200 is 88

ella   got 198/ 200

Answer: D, 180 - 130

Answer: Proportional

Step-by-step explanation: Any table that starts with (0,0), it means it’s proportional!

The equation of the line in the given graph, in slope-intercept form, is determined as: y = 1/2x + 4.

In slope-intercept form, we can express the equation of a line as, y = mx + b, where, m is the slope and b is the y-intercept of the graph.

Slope of the line (m) = change in y /change in x = 1/2

Y-intercept (b) = 4

Substitute m = 1/2 and b = 4 into y = mx + b:

y = 1/2x + 4

The equation of the line is: y = 1/2x + 4.

Learn more about equation of a line on:

https://brainly.com/question/13763238

#SPJ5

Answer:

7/3

Step-by-step explanation:

Use keep change flip

7×3=21 9×1=9

21/9=7/3

[tex]\frac{7}{9}[/tex]

Remember the rule for dividing fractions, keep, change, flip.

Keep the first fraction, change the division sign to a multiplication sign, flip the 2nd fraction, or find the reciprocal of the second fractions.

[tex]\frac{7}{9}[/tex]÷[tex]\frac{1}{3} = \frac{7}{9} * \frac{3}{1} = \frac{21}{3} = 7[/tex]

Answer:

Step-by-step explanation:

0       10

1        21

2      32

3      43

i donno if thats what you wanted

Answer:

0      43         turns into      1         44

1        32                              2        33

2        21                             3          22

3        10                              4          11

Step-by-step explanation:

Answer:

£180,£540 and £180

Step-by-step explanation:

Looking at the information presented, we don't have the percentages given neither do we have the items bought

However, let's say the money was spent on drinks, hotel reservations and food.

20% on food

60% on hotel reservations and

20% on transportation

We can now compute the individual cost of the a amount spent on each category from their percentage

For food

=20/100*900

=0.2*900

=180

Hotel reservations

=60/100*900

=0.6*900

=540

Foe transportation

=20/100*900

=0.2*900

=180

So, if you have your data, only follow the steps above and you will get your answers

To check, when we add all the amounts together they should sum up to 900

180+540+180=900

Answer:

Hint: x is a negative number.

Step-by-step explanation:

The equation is x + 12 = -6 and you are trying to find x. The easiest way to solve this equation is by first subtracting 12 from both sides. It would look like x + 12 - 12 = -6 - 12. Since positive 12 and negative 12 are opposite and equal, they cancel each other out. This can be drawn as well into circles and crossed out for every positive circle with a negative circle. As for -6 and -12, you can use the same method of drawing circles, (trust me they can be very helpful, especially for people like me who need to see it visually before getting a hang of it). Since both are negatives, you would have to add them together and that would give you x.

(Please reply if you still have questions. :) Have a wonderful day)

Answer: 15v

Step-by-step explanation: we can combine all the terms since they all have “v” in them making 6+6+3 which is 15, just add “v” to get 15v

Answer:

-9n-6

Step-by-step explanation:

sm

Answer: Solution

3n+(-6n)-6

Step-by-step explanation:

Answer:

5.5 is the answer

:)

Step-by-step explanation:

Answer:

The ball will hit the ground at 10 seconds and its maximum height is 1024 feet.

Step-by-step explanation:

Height of a mountain, h = 90 feet

Upward velocity of a ball, u = 64 ft/s

Its height as a function of time can be written by using the second equation of motion as follows :

[tex]f(x) = -16t^2 + 64t + 960[/tex] .....(1)

When it will hit the ground, f(x) = 0

[tex]-16t^2 + 64t + 960=0\\\\16(-t^2+4t+60)=0\\\\-t^2+4t+60=0[/tex]

It is quadratic equation.

t = -6 s and t = 10 s

Neglecting -6 seconds, the ball will hit the ground at 10 seconds.

For maximum height,

Put f'(x) = 0

[tex]-32t+64=0\\\\\\t=\dfrac{64}{32}\\\\t=2\ s[/tex]

Put t = 2 in equation (1)

[tex]f(2) = -16(2)^2 + 64(2) + 960\\\\=1024\ \text{feet}[/tex]

Hence, the ball will hit the ground at 10 seconds and its maximum height is 1024 feet.

Answer:

Radius of sphere = 3 feet

Step-by-step explanation:

The volume of sphere is 36 π ft³.

We need to find the radius of sphere.

The formula used is: [tex]Volume\:of\:sphere=\frac{4}{3}\pi r^3[/tex]

Putting value of volume and finding radius

[tex]Volume\:of\:sphere=\frac{4}{3}\pi r^3\\36\pi =\frac{4}{3}\pi r^3\\r^3=36 \pi \times \frac{3}{4\pi} \\r^3=9 \times 3\\r^3=27\\Taking\:cube\;root\:on \:both\:sides\\\sqrt[3]{r^3}=\sqrt[3]{27}\\r=3[/tex]

So, Radius of sphere = 3 feet

Answer:

0

Step-by-step explanation:

2.5=2/5 so 2.5-2/5=0

.

Answer/Step-By-Step Explanation:

A). 4/52 —> 1/13

B). 1/52 (there’s only one Queen of Hearts)

C). 4/52 —> 1/13

D). 8/52 —> 2/13 (cards less than 4 are 2 and 3).

E). 13/52 —> 1/4

F). 8/52 —> 2/13 (probability of choosing a queen is 4/52, probability of a 3 is 4/52).

G). 12/52 —> 3/13

Answer:

c

Step-by-step explanation:

because -1.8is tennecally the oposites but it hase the same number so i think its c

Answer:

-4/3

Step-by-step explanation:

Use the slope formula:

[tex]\frac{y2-y1}{x2-x2}[/tex]

-4 - 12/ 13 - 1

-16/12

Simplifies to -4/3