MATHEMATICS MIDDLE SCHOOL

A class has 28students. The ratio of girls to boys is 4:3. How many girls are in the class?

Answers

Answer 1
Answer:

Answer:  

In a class of 28 students the ratio of girls and boys is 4:3. The number of girls in the class is 16.

Solution:  

Let us consider total number of students in the class is “T”.

Let the ratio of the students (Girl and boys) in the class is G: B.

Given that total number of students in class (T) = 28

From question, given that ratio of girls and boys is 4:3. We can write this ratio as,

Number of girls (G) = 4x and number of boys (B) = 3x

We have to find the number of girls in class. The total number of girls present in the class is given as ,

G = T * (G)/(G + B)

The total girl students present in the class G = 28 * (4 x)/(4 x + 3 x) = 28 * (4 x)/(7 x)

= 28 * (4)/(7) = 4 * 4 = 16

Hence the total number of girls in the class is 16.
Answer 2
Answer: There are 4+3=7 parts in total
4x7=28
16 are girls and the balance is 12 boys

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HELPFor the system below solve using linear combinations method 4x-7y=-2 and 12x-21y=-42

Answers

No solution 

cz 

12x-21y=-42   -----> /3  (divided by 3 )
4x-7y=14  ------ (2)
4x-7y=-2  ------- (1)

how 4x-7y =14 an = -2

and if we 
(2)-(1)
0=12  
#

What does the b value represent? in Exponential FunctionsA. Initial amount
B. Rate of growth/decay
C. Independent variable
D. Dependent variable

Answers

The answer is

C



Hope it helped :)

What is the product (3x-6)(2x2-7x+1)

Answers

Answer:

\large\boxed{6x^3-33x^2+45x-6}

Step-by-step explanation:

\text{Use FOIL:}\ (a+b)(c+d)=ac+ad+bc+bd\n\n(3x-6)(2x^2-7x+1)\n\n=(3x)(2x^2)+(3x)(-7x)+(3x)(1)+(-6)(2x^2)+(-6)(-7x)+(-6)(1)\n\n=6x^3-21x^2+3x-12x^2+42x-6\qquad\text{combine like terms}\n\n=6x^3+(-21x^2-12x^2)+(3x+42x)-6\n\n=6x^3-33x^2+45x-6

What is the value of 62 tens

Answers

62 tens is equal to 620, so 62x10=620. Lets split the equation up, 60 x 10 = 600 , 2 x 10 = 20 , so now add 600 and 20, 600 + 20 = 620

Hopefully this helped you.
The value of 62 tens would be just like multiplying 62 by 10 so 62x10=620
Your answer is 620.

Hope this Helps

In determining the quality of the hats in a used-hat bin, a grandmother selects the first four hats she can reach. Which sampling technique did she use?Select one:
a. systematic sampling
b. convenience sampling
c. stratified random sampling
d. voluntary response sampling

Answers

b convenience sampling because if it looks bad then she should throw it away but if it looks good then she should keep it 

A typist can type 3 pages in 20 minutes.How many pages can he type in an hour?

Answers

An hour is 60 minutes, divide 60 by 20(that equals 3), then  multiply 3 by 3 to get the answer 9 pages.
9 pages because there are 3 pages for every 20 minutes so you add 20+20+20=60 which is an hour then add 3 each time you add 20 minutes
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