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3 years ago

What figures have rotation symmetry? PLEASE HELP I NEED A GOOD GRADE

Mathematics

2 answers:

Darina [25.2K]3 years ago

6 0

if set up like

1 2

3 4

its 1 and 4

1 has 90deg rotationals and 4 has 180 the other two don't.

Ivanshal [37]3 years ago

5 0

The figures on the top left and the bottom right have rotational symmetry.

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How many factors does (2x+5) have

zalisa [80]

Answer:
three (3) factors

Explanation:
2, x and 5 are all factors.

hope this helps! <3

6 0

3 years ago

There are 3 black marbles and 4 red marbles in a bag.

devlian [24]

3 + 4 = 7 all marables in bag
The probability that the first marable is black
$P(A_1)=\dfrac{3}{7}$
The probability that the second marable is black too
$P(A_2)=\dfrac{2}{6}=\dfrac{1}{3}$
Together:
$P(A)=P(A_1)\cdot P(A_2)=\dfrac{3}{7}\cdot\dfrac{1}{3}=\dfrac{1}{7}\to D$

8 0

3 years ago

Use Cramer's Rule to find x in the system of equations below.

Ronch [10]

Answer: x = 4 , y = -3

Step-by-step explanation:

Going by the Cramer's rule , we first determine the determinant by dealing with only the coefficients of x and y in the 2 x 2 matrix.

2x - 3y = 17

5x + 4y = 8

2 -3

5 4, going by the rule now, we now have

(2 x 4) - (5 x -3)

8 + 15

= 23.

Now to find the value of x , replace the constants with the coefficient of x and divide by he determinants.

17 -3

8 4

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

2 -3

5 4

( 17 x 4 ) - ( 8 x -3 )

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

= 68 + 24

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

= 92/23

= 4.

x = 4

Now to find y, just repeat the process by replacing the coefficient of y with the constants.

2 17

5 8

-----------

2 -3

5 4

( 2 x 8 ) - ( 5 x 17 )

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

16 - 85

---------

= -69/23

= -3

y = -3.

check

substitute for the values in any of the equations above.

2(4) - 3(-3)

8 + 9

= 17

8 0

3 years ago

Given the following triangle solve for the unknown angle.

svetlana [45]

Since it is shown that 2 of the sides of the triangle are congruent, we can assume that they have the same angle measures.

so to solve for the missing angle you can set up an equation equal to 180 since all triangles add up to 180 degrees.
21 + 21 + x = 180
42 + x = 180
x = 138

the value of the missing angle should be 138 degrees

hope this helped

4 0

3 years ago

An expirement consists of rolling two fair number cubes. What is the probability that the sum of the two numbers will be 4? Expr

ExtremeBDS [4]

Answer:

$\dfrac{1}{12}$

Step-by-step explanation:

Given:

Two fair number cubes i.e. two dice consisting the numbers 1, 2, 3, 4, 5, 6 on their faces and have equal probability of each number.

The dice are rolled.

To find:

Probability of getting the sum of two numbers as 4.

Solution:

First of all, let us have a look at the total possibilities when two dice are rolled:

([1][1], [1][2], [1][3], [1][4], [1][5], [1][6],

[2][1], [2][2], [2][3], [2][4], [2][5], [2][6],

[3][1], [3][2], [3][3], [3][4], [3][5], [3][6],

[4][1], [4][2], [4][3], [4][4], [4][5], [4][6],

[5][1], [5][2], [5][3], [5][4], [5][5], [5][6],

[6][1], [6][2], [6][3], [6][4], [6][5], [6][6])

These are total 36 possible outcomes.

For getting a sum as 4:

Possible number of favorable cases are 3 (as highlighted in BOLD in above)

Formula for probability of an event E can be observed as:

$P(E) = \dfrac{\text{Number of favorable cases}}{\text {Total number of cases}}$

Required probability is:

$\dfrac{3}{36} = \bold{\dfrac{1}{12}}$

5 0

3 years ago