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mel-nik [20]
2 years ago
7

Help me with this please

Mathematics
2 answers:
Nataliya [291]2 years ago
8 0
Answer:1/2
Explanation
stiv31 [10]2 years ago
6 0

Preliminary:

Fractions in Mathematics are rational numbers that can be written in the form x/y, where x and y are integers, and y 0 and the number x is not a multiple of y. In fractions x is called the numerator while y is called the denominator.

Fraction Types:

  • Common Fraction = is a fraction expressed in the form x/y, x as the numerator and y as the denominator. x and y are integers and y 0
  • Mixed fraction = is a combination of whole numbers and fractions, expressed in the form a \frac{b}{c}
  • Decimal fractions are indicated by a comma (,) as a separator between the round and fractional parts. The round part is in front of the comma and the fraction part is behind it. One digit after the comma means the denominator of the fraction 10, two digits after the comma means the denominator of the fraction 100, and so on.
  • A percent fraction is a fraction that has a denominator of 100, expressed in the form a%. example 50% is the same as \frac{50}{100}

Answer:

\frac{1}{2}

Step-by-step explanation:

3( \frac{6}{8}  -  \frac{1}{2} ) + 0.25 =  \frac{3 \times 2}{4 \times 2}  -  \frac{1}{2}  =  \frac{3 - 2 \times 1}{4}  =  \frac{1}{4}  + 0.25 =  \frac{50}{100}  =  \frac{1 \times 50}{2 \times 50}  =  \frac{1}{2}

<h3>Answer Details:</h3>

Grade: 6-Primary School

Subject: Math

Chapter: 6

Sub-chapter: Fractional Counting

Categorization Code: 6.2.6

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6. Sketch the region enclosed by the graphs of x =0, 6y-5x=0 and x+3y=21. Find the area
kow [346]
We can see that revolving the region formed by intersecting 3 lines, we will get 2 cones that are connected their bases.
Volume of the cone V=1/3 *πr²*h

1) small cone has r=5, and h=5
Volume small cone V1= 1/3 *π*5²*5 = 5³/3 *π
2) large cone has r=5, and h=21-6=15, h=15
Volume large cone V2= 1/3 *π*5²*15 = 5³*π
3) whole volume
5³/3 *π + 5³*π=5³π(1/3+1)=((5³*4)/3)π=(500/3)π≈166.7π≈523.6

Area
we see 2 right triangles,
Area of the triangle=1/2*b*h, where b -base, h -height
1) small one, b=5, h=5
A1=(1/2)*5*5=25/2
2)large one, b=5, h=15
A2=(1/2)*5*15=75/2
3) whole area=A1+A2=25/2+75/2=100/2=50

3 0
2 years ago
Read 2 more answers
Solve the system by substitution<br> 10x=y<br><br> 2x+y=-24
masha68 [24]

Answer: x=-2

Y= -20

Step-by-step explanation

You replace the y in the second equation with 10x. This is because it says 10x=y

2x+10x=12x so you put that

12x=-24

To get x by its self you divide by 12.

-24 divided by 12 is -2.

Now you plug in -2 to either equation as y. I chose the first one because it's easier.

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8 0
2 years ago
6n-3&gt;-18<br> Solve the inequality
Tamiku [17]

Answer:

<h3>n>-5/2</h3>

Step-by-step explanation:

First, you have to isolate it on one side of the equation. Remember that, isolate n on one side of the equation.

6n-3>-18

6n-3+3>-18+3 (Add 3 from both sides.)

-18+3 (Solve.)

-18+3=-15

6n>-15

6n/6>-15/6 (Divide by 6 from both sides.)

-15/6 (Solve.)

-15/6=-5/2

n>-5/2

In conclusion, the correct answer is n>-5/2.

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