1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
RUDIKE [14]
2 years ago
7

Toss a coin 7 times. what is the number of sequences of heads or tails?

Mathematics
1 answer:
dezoksy [38]2 years ago
5 0
2 to 7 or 2/7 or 2:7
You might be interested in
Alex is selling tickets to a school play. An adult ticket costs $6.50 and a student ticket costs $4.00. Alex sells x adult ticke
Tamiku [17]
F(X)=(4)12+x6.50
f(x)=48x+6.50
3 0
3 years ago
Which shape does the intersection of the vertical plane with the prism look like?
Verizon [17]

Answer:

it looks like an triangle in the option above lol

7 0
3 years ago
5th Grade Science Very Easy plz help me :3 NO LINKS
givi [52]

Answer:

rubbing it against your hair it causes friction and with friction comes energy

3 0
2 years ago
Read 2 more answers
How to find the central angle of a regular polygon
Annette [7]

Answer:

I hope this helps

Step-by-step explanation:

Central angle of a regular polygon:

The central angle of a polygon is the angle made at the center of a polygon by any two adjacent vertices as shown in the figure below.

In the above figure, the angles a, b, c, d, e and f are the central angles of the hexagon. There are 6 central angles in a hexagon. The number of central angles in a polygon is always equal to the number of sides of the polygon.

As you can see in the figure above, all the central angles of the polygon together will always form a complete circle. Hence the central angles add up to 360° in all polygons. Since a regular polygon has all equal sides, the central angles in a regular polygon are also equal.

So to find the measure of the central angles of a regular polygon follow the steps below:

First identify the number of sides ‘n’.

Then divide 360° by n.

For example: say you need to find the central angle of a regular pentagon.

First identify the number of sides ‘n’: here n = 5

Then divide 360° by n: 360° ÷ 5 = 72°.

Conversely, you can also find the number of sides of a regular polygon, when the central angle is given, by dividing 360 by the central angle.

Note: In the case of an irregular polygon, since there is no clear center for an irregular polygon, it has no central angle.

3 0
3 years ago
Can someone help me please? Use the linear combination method to solve the system of equations. Pretty please show your work and
Pavel [41]

Answer:

  (x, y) = (4, -3)

Step-by-step explanation:

  • x-3y=13
  • 2x+4y=-4

First of all, look at the given equations. Here, we see that the second equation has coefficients that all have a factor of 2. If we divide that out, we get an equation that has an x-coefficient of 1, matching the x-coefficient in the first equation.

Here is the reduced second equation:

  x +2y = -2

Now, if we subtract one equation from the other, the variable x will be eliminated. We want to choose that subtraction wisely.

We note that the y-coefficient in the first equation is less than that in the second equation. If we subtract the first equation from the second, the result will have a positive y-coefficient:

  (x +2y) -(x -3y) = (-2) -(13)

  5y = -15 . . . . . . . . . . . . . . . . simplify. Note that the x-variable is eliminated, which is the purpose of this exercise.

  y = -3 . . . . . . . divide by 5

We can use this value in the reduced second equation to find the value of x:

  x +2(-3) = -2

  x = 4 . . . . . . . . . add 6 and simplify

The solution is (x, y) = (4, -3).

_____

I find a graphing calculator provides an easy and reliable check of the answer.

_____

<em>Comment on linear combination</em>

This method is often called "elimination," because the purpose of combining the equations in a particular way is to eliminate one of the variables. This requires you look at the coefficients of the variables and devise a plan to combine them so the resulting coefficient for one of the variables is zero.

In the worst case, you can combine ...

  • ax +by = c
  • dx +ey = f

by multiplying the second equation by <em>a</em> and the first by <em>-d</em>:

  a(dx +ey) -d(ax +by) = a( f) -d(c)

  y(ae -bd) = fa -cd . . . . . . simplify; x is eliminated

This sort of approach results in a formula for the solution known as Cramer's Rule.

  y = (fa-cd)/(ae-bd)

The corresponding solution for x is ...

  x = (ce-bf)/(ae-bd)

__

The point of looking at the equations first is that you can often choose which variable to eliminate and what multiplier to use to minimize the amount of arithmetic involved—as we did above.

5 0
3 years ago
Read 2 more answers
Other questions:
  • In the figure, angle G measures 117°, angle C measures 22°, and angle E measures 40°.
    7·1 answer
  • What is the slope of the line through (11, 10) and (12, 5)?
    12·1 answer
  • The sum of two numbers is 51 and the difference is 15 . What are the numbers?
    11·1 answer
  • The diagram shows a cone and its axis of rotation. If a plane passes through the axis of rotation, which type of cross section w
    8·2 answers
  • If six times a number is decreased by fourteen, the result is 124. What is the number
    5·2 answers
  • Answer please?? 50+40+10=
    6·2 answers
  • WILL GIVE BRAINLIEST
    14·1 answer
  • 3) 9i(3)+ 9i(2)+ 18i + 36​
    10·1 answer
  • Solve the linear system by graphing <br> y=x+2 and y=-6x+9
    8·1 answer
  • Round to the nearest cent.<br> ​$37,045.56728
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!