A group of 13 friends were planning a trip. On the night before they left they made a lot of phone calls. Each friend talked to every friend at least once. What is the fewest phone calls that would have been made.

Answer:

N = 18

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Equality Properties

Step-by-step explanation:

Step 1: Define

Identify

N + 9 = 27

Step 2: Solve for N

Answer:

none if abive

Step-by-step explanation:

Please check your question .......

Answer:

f(x) ≤ x2 – x – 1

Step-by-step explanation:

Answer:

The graph will have opposite x-intercepts of b and –b and be symmetrical about the y-axis. The graph will have a y-intercept at –b2.

Step-by-step explanation:

i don't have the step by step explanation but that answer is also right

the x intercepts are b and b

the graph has opposite x intercepts

the graph is symetrical  over the y axis

the y intercept is at b²

Answer:

f(x) ≤ x2 – x – 1

Answer:

890

Step-by-step explanation:

i hope this helped

Answer:

1,280, –2560, 5120

Step-by-step explanation:

I got it right on grandpoint.

Step-by-step explanation:

Area  = πr²

2) 11² x 3.14 = 379.94

3) 3² x 3.14 = 28.26

4) 5² x 3.14 = 78.5

5) 6.5² x 3.14 = 132.665

6) 7.2² x 3.14= 162.7776

Answer:

just for yourself and you to a Dictionary with th

Answer:

The first option

Step-by-step explanation:

slope is -2/6

I.e. -1/3

1 box= 36 paper plates

12 boxes = 12× 36 paper plates

= 432 paper plates

He used 173 paper plates for the birthday party of his son

No. of paper plates were left = 432-173 = 259

Explanation:

A linear pair of angles is where they are both adjacent and supplementary.

Adjacent angles share a common line or ray. In this case, they share ray FE.

Supplementary angles add to 180. So they combine to a straight angle.

Answer:

Linear pair

Step-by-step explanation:

Their nonadjacent sides formed a line

Step-by-step explanation:

Write what tou know

volume of a cone

V = (πr2h)/3

d =2.2in

r = d /2

h = 1.8

evaluate that

to find ounces

amount of ounces = Volume of cone x 0.554

Answer:

store B

Step-by-step explanation:

Answer:

30m x 40m

Step-by-step explanation:

The diagram is 15cm x 20cm

since 1cm = 2m

the backyard measures

30m x 40m

Answer:  The backyard is 30 meters by 40 meters

30 meters = horizontal dimension

40 meters = vertical dimension

===========================================================

Explanation:

The pool on paper is 7.5 units across horizontally. Applying the scale factor, we can see that it corresponds to 7.5*2 = 15 meters

The 20 meter portion is vertical. On paper, we see that it's 10 units tall. So the "times 2" operation applies to jump from 10 cm to 20 meters

Or you could note that the ratio 1 cm : 2 m scales up to 10 cm : 20 m after multiplying both parts by 10.

-----------------

With that in mind, all we need to do really is count the number of squares across the top and along the left side. Across the top, we have 15 squares. That 15 cm corresponds to 15*2 = 30 meters in length.

Along the left side, the figure is 20 cm tall. So that corresponds to 20*2 = 40 meters.

The backyard is 30 meters by 40 meters. This includes the backyard, shed, and other features in the diagram. The entire backyard is 30*20 = 600 square meters. If you wanted to know the area of the grass only, then you'd subtract off the areas of the pool, shed, etc.

-----------------

Your teacher mentions that the pool is similar to the backyard overall. Since we're in a geometry setting, the word "similar" is very specific of course.

We can match up the corresponding lengths to form a proportion like so

(large horizontal)/(small horizontal) = (large vertical)/(small vertical)

30/15 = 40/20

2 = 2

So that confirms we have similar figures, at least in terms of the sides being proportional. Everything being a rectangle helps show that all angles are the same.

Answer:

4

Step-by-step explanation:

8.0,8.1,8.2,8.3...........

8÷2=4

It's actually 4.1 or by rounding off its 4.

We can prove this because 8÷2=4, so, 8.1÷2=4.1

Or 4.

Hope it helps you... pls mark brainliest if it helps you

Answer:

Part A)

A reasonable domain to plot the growth function is:

[tex]0\leq d \leq 12[/tex]

Part B)

The y-intercept represents that when the biologist started her study, the radius of the algae was five millimeters.

Part C)

The average rate of change from d = 4 to d = 11 was about 0.11. This means that from the 4th day to the 11th, the radius of the algae grew, on average, at a rate of 0.11 mm per day.

Step-by-step explanation:

The radius of the algae f(d) in millimeters after d days is given by the function:

[tex]f(d)=5(1.02)^d[/tex]

Part A)

We know that the radius of the algae was approximately 6.34 mm when the biologist concluded her study. To find the reasonable domain, we can substitute 6.34 for f(d) and solve for d. Therefore:

[tex]6.34=5(1.02)^d[/tex]

Divide both sides by five:

[tex](1.02)^d=1.268[/tex]

Take the log of both sides with base 1.02:

[tex]\displaystyle d=\log_{1.02}1.268[/tex]

Using the Change of Base Property, evaluate for d:

[tex]\displaystyle d=\frac{\log 1.268}{\log 1.02}=11.9903...\approx 12[/tex]

So, the biologist concluded her study after 12 days.

Therefore, a reasonable domain to plot the growth function is:

[tex]0\leq d\leq 12[/tex]

Part 2)

The y-intercept of the function is when d = 0. Find the y-intercept:

[tex]f(0)=5(1.02)^{(0)}=5(1)=5[/tex]

Since d represent the amount of days after the study had begun, the y-intercept represents the radius of the algae on the initial day.

So, when the biologist started her study, the radius of the algae was five millimeters.

Part 3)

To find the average rate of change for a nonlinear function, we find the slope between the two endpoints on the interval.

We want to find the average rate of change of f(d) from d = 4 to d = 11.

Find the endpoints:

[tex]f(4)=5.4121...\text{ and } f(11)=6.2168...[/tex]

And find the slope between them:

[tex]\displaystyle m=\frac{f(11)-f(4)}{11-4}=0.1149...\approx 0.11[/tex]

Since f(d) measures millimeters and d measures days, this tells us that, on average, the radius of the algae grew by about 0.11 mm per day from the 4th day to the 11th day.

Answer:

first one because the second one is solvable through graphing

Step-by-step explanation: y = mx +b could be anything

Answer:

33.48

Step-by-step explanation:

Find the diagram attached

Opposite  = 32

Hypotnuse = 58

Sin theta = opposite/hypotenuse

Sin theta = 32/58

Sin theta = 0.5517

theta = arcsin(0.5517)

theta = 33.48

Hence the value of x to the nearest tenth is 33.48

Answer:

18 pi inches

Step-by-step explanation:

The area of a circle is

A = pi r^2

81 pi = pi r^2

81 = r^2

Taking the square root of each side

9 = r

We can now find the circumference

C = 2 * pi *r

C =2 * pi *9

C = 18 pi

Answer:

[tex]52[/tex]

Step-by-step explanation:

[tex]n + 94 = 32 + 114[/tex]

[tex]n + 94 = 146[/tex]

[tex]n = 146 - 94[/tex]

[tex]n = 52[/tex]

Answer:

x^2+22x+121

Step-by-step explanation:

(x)^2+2*x*11+11^2

=x^22x+121

Answer:

6

Step-by-step explanation:

Answer:

I am pretty sure it's 495

Step-by-step explanation:

The context of this problem makes me think that the order in which the sites are in does not matter

if that's the case we can solve this using combinations

the combinations formula is as follows:

ACB= [tex]\frac{A!}{(A-B)!*B!}[/tex]

so 12C4= [tex]\frac{12!}{(12-4)!*4!}=495[/tex]

Answer:

90degree because of O is center of circle and mAB come from radius

Step-by-step explanation:

Answer:

74

Step-by-step explanation:

well, you see, потому что я плохая сука-ниггер, да бруддахол лмао

Answer:

a=6

Step-by-step explanation:

Since this is a right triangle, we can use the Pythagorean theorem

a^2 + b^2 = c^2  where a and b are the legs and c is the hypotenuse

a^2 + 8^2 = 10^2

a^2 + 64= 100

a^2 +64-64 = 100-64

a^2 = 36

Take the square root of each side

sqrt(a^2) = sqrt(36)

a = 6

Answer:

a = 6

Step-by-step explanation:

According to the question,

Using Pythagorean theorem

( a )² + ( b )² = ( c )²

( a )² + ( 8 )² = ( 10 )²

evaluate the exponent

a ² + 64 = 100

subtract 64 from each side

a ² + 64 - 64 = 100 - 64

a ² = 36

Take the square root of each side

√a² = √36

a = 6

Answer:

hi how are you

Step-by-step explanatio

https://socratic.org/questions/how-do-you-solve-sqrt3cosx-sinx-1-in-the-interval-0-360#333481

so

Step-by-step explanation:

you divide 1 by 2 then time the denominator by 69

Answer:

So B has the greatest value of slope.

Step-by-step explanation:

A has a negative slope, so A is out.

B, C and D all have positive slopes.

B has a greater slope than C, so C is out.

B has a finite slope, and D has a "slope" of infinite, but much of the time it does not count, because we do not make calculations with infinite slopes, and infinity is not a number (value).

So B has the greatest value of slope.

Answer:

The area of the shaded region is 240 ft.

Step-by-step explanation:

Area Formula: A = L * H

First, find the area of the WHOLE shape. (300 = 25 * 12)

Next, find the area of the WHITE section. (60 = 5 * 12)

Lastly, subtract the area of the entire shape to the area of the white section. (300 - 60 = 240)

Your final answer should be 240 ft. Hope this helps! :D

9514 1404 393

Answer:

Step-by-step explanation:

The parent function f(x) = a^x has a domain of all real numbers, a range of y>0, a y-intercept of 1, and an asymptote of y=0. It is a growth function for a>1, a decay function for 0<a<1.

Here, you have a=4, and the value -7 has been added. That addition translates the graph downward 7 units, so you have ...

Answer:

d

Step-by-step explanation: