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Ivanshal [37]
3 years ago
13

There are 9 students in a class. The teacher chooses 2 students to go to the

Mathematics
1 answer:
Ahat [919]3 years ago
8 0

Answer: 72

<u>Step-by-step explanation:</u>

There are 9 students to choose from to go the library. After that person is chosen there are 8 students remaining.

First student  and   Second student

           9           x               8                 = 72

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Show that the equation represents a circle and find its center and radius.<br> x2 + y2 +6y + 2 = 0
Dafna11 [192]

Answer:

Step-by-step explanation:

The general equation of a circle can be expressed as (x-a)²+(y-b)² = r² where (a,b) is the centre of the circle and r is the radius.

To show that the equation x² + y² +6y + 2 = 0 represents a circle, we need to write it in the format above using the completing the square method.

Given x² + (y² +6y) + 2 = 0

First we need to complete the square of the square in parenthesis by adding the square of half of the coefficient of y i.e (\frac{1}{2}*6) ^2 to the equation and adding the constant to the other side of the equation as well.

x² + (y² +6y) + 2 = 0

x^2+(y^2+6y+(\frac{1}{2}*6) ^2)+2 = 0+(\frac{1}{2}*6) ^2\\x^2+(y^2+6y+(3) ^2)+2 = 0+3 ^2\\x^2+(y^2+6y+9)+2 = 0+9\\x^2+(y+3)^2+2 = 9\\x^2+(y+3)^2+2-2 = 9-2\\x^2+(y+3)^2 = 7\\(x-0)^2+(y+3)^2 = 7\\

<em>Hence the equation represents a circle with centre C at (0, -3) and radius of √7</em>

7 0
3 years ago
For every 5 boys, there are 3 girls. If there are 60 students how many boys are there?
adell [148]

Answer:

not solvable

Step-by-step explanation:

so there is a ratio of 5:3

that equals 8 parts

if you divide 60 by 8 that's 7.5

times 7.5 by 5 and you get 37.5

don't know how u get half a person but that's just how it is

8 0
3 years ago
HELP PLEASE HURRY!!
frozen [14]

Answer:

9.9225 E 34.

E = exponent

= 9.9225 x 10^34

Step-by-step explanation:

5 0
3 years ago
A variable that is both (1) mutually exclusive, (2) exhaustive, (3) has a rank order AND (4) has equal distance between categori
kodGreya [7K]

Answer:

<em>Interval variables</em>

Step-by-step explanation:

<em>An interval variable which is also refereed to as ordinal variable with the additional property that t has differences in magnitudes of the between two  meaningful values</em>

<em>An example of an interval variable is ,when a temperature of 90 degrees and 100 degrees is the same difference as between 90 degrees and 80 degrees.</em>

<em>Interval variables are also said to be mutually exclusive , exhaustive and also having a rank or ranking order.</em>

6 0
3 years ago
Pls help me no one helps me
Ahat [919]

Answer:

20% error

Step-by-step explanation:

easy

9.4/7.8 or do 0.078x=9.4

1.20512820513

round to nearest tenth

1.2

means

20% error

4 0
2 years ago
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