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Ratling [72]
3 years ago
12

A problem states there are seven more girls than boys and I class there are 23 students in the class in all how many girls are t

here in the class
Mathematics
1 answer:
netineya [11]3 years ago
7 0
W R I T E   T H E  E Q U A T I O N

23 = X + (X+7)
23 = 2X + 7
16=2X
/2   /2
8=X

Girls = X+7
         = 8+7
         = 15

S O   T H E R E   A R E   1 5   G I R L S


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What is the greatest integer a, such that a^2 + 3b is less than (2b)^2, assuming that b is 5? Please answer and have a nice day!
solniwko [45]
<h3>Answer: Largest value is a = 9</h3>

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

Work Shown:

b = 5

(2b)^2 = (2*5)^2 = 100

So we want the expression a^2+3b to be less than (2b)^2 = 100

We need to solve a^2 + 3b < 100 which turns into

a^2 + 3b < 100

a^2 + 3(5) < 100

a^2 + 15 < 100

after substituting in b = 5.

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

Let's isolate 'a'

a^2 + 15 < 100

a^2 < 100-15

a^2 < 85

a < sqrt(85)

a < 9.2195

'a' is an integer, so we round down to the nearest whole number to get a \le 9

So the greatest integer possible for 'a' is a = 9.

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

Check:

plug in a = 9 and b = 5

a^2 + 3b < 100

9^2 + 3(5) < 100

81 + 15 < 100

96 < 100 .... true statement

now try a = 10 and b = 5

a^2 + 3b < 100

10^2 + 3(5) < 100

100 + 15 < 100 ... you can probably already see the issue

115 < 100 ... this is false, so a = 10 doesn't work

5 0
3 years ago
Molly had already read 6 books this year before joining a book club, and she plans to read 3 books every month now that she has
tatuchka [14]

Answer:

12 months

Step-by-step explanation:

Given data:

Before joining club 6 books read

3 books every month

total books read 42

books read after joining the club = 42 - 6

books read after joining the club = 36

Months she has in book club = 36/3

Months she has in book club = 12 months

7 0
3 years ago
Please help me as fast as you can PLEASE
e-lub [12.9K]

Answer:

C

Step-by-step explanation:

6 0
3 years ago
What is the coefficient of x in expansion of (2x-4)^2 ?
Sunny_sXe [5.5K]

Answer:

2

Step-by-step explanation:

the one which is near to x

8 0
2 years ago
Help
kobusy [5.1K]

The equation of the line is y - 3 = 5(x - 8) ⇒ c

Step-by-step explanation:

The point-slope form of the linear equation is y-y_{1}=m(x-x_{1}) , where:

  • m is the slope of the line
  • (x_{1},y_{1}) is a point on the line

∵ The line passes through point (8 , 3)

∴ x_{1} = 8 and y_{1} = 3

∵ The slope of the line is 5

∴ m = 5

- Substitute these values in the form of the equation below

∵ y-y_{1}=m(x-x_{1})

∴ y - 3 = 5(x - 8)

The equation of the line is y - 3 = 5(x - 8)

Learn more:

You can learn more about the linear equations in brainly.com/question/1284310

#LearnwithBrainly

3 0
3 years ago
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