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3 years ago

In a class of 25 students, 20 have a brother and 8 have a sister. There are 3 students

Mathematics

1 answer:

kaheart [24]3 years ago

6 0

Answer: 6/8 or 3/4 or 0.75

Step-by-step explanation:

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Solve for y: 3x - 4y = 12

Tju [1.3M]

3x-4y=12
4y=3x-12
y=(3x-12)/4
y=(3/4)x-3

3 0

3 years ago

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Which word correctly completes the sentence. the motorcycle fell over on _______ side A.it's B.its

777dan777 [17]

B "it's" means (it is) and that would not make sense if it fell on it is side .

4 0

3 years ago

A,B and C are the vertices of one triangle.

dsp73

Answer:

Step-by-step explanation:

Given: The triangle with coordinate A(4,6), B(2,-2) and C(-2,-4). D is the mid point of AB and E is the mid point of AC.

To prove: DE is parallel to BC.

Construction: Join DE.

Proof: If we prove the basic proportionality theorem that is $\frac{AD}{DB}=\frac{AE}{EC}$ , then it proves that DE is parallel to BC.

Now, Mid Point D has coordinates= $(\frac{4+2}{2},\frac{6-2}{2})=(3,2)$ and Mid Point E has coordinates= $(\frac{4-2}{2},\frac{6-4}{2})=(1,1)$

Now, AD= $\sqrt{(4-3)^{2}+(6-2)^{2}}=\sqrt{17}$

DB= $\sqrt{(3-2)^{2}+(2+2)^{2}}=\sqrt{17}$

AE= $\sqrt{(4-1)^{2}+(6-1)^{2}}=\sqrt{34}$

EC= $\sqrt{(1+2)^{2}+(1+4)^{2}}=\sqrt{34}$

Now, $\frac{AD}{DB}=\frac{AE}{EC}$

= $\frac{\sqrt{17}}{\sqrt{17}}=\frac{\sqrt{34}}{\sqrt{34}}=\frac{1}{1}$

Hence, $\frac{AD}{DB}=\frac{AE}{EC}$

Thus, By basic proportionality theorem, DE is parallel to BC.

4 0

3 years ago

Read 2 more answers

Scarlett is playing a video game. She spends 90 minerals to create 18 workers. Each worker costs the same number of minerals. Wr

Gnoma [55]

Answer:

$m=5w$

Step-by-step explanation:

Let

m-----> the amount of minerals

w-----> the number of workers

we know that

$\frac{m}{w}=\frac{90}{18}=5$

$m=5w$ -----> the relationship represent a proportional variation

7 0

2 years ago

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Sheri built a 1/200 scale model of a dam. She used 0.1 cubic meter of plaster. What is the volume of the actual dam in cubic met

Fynjy0 [20]

The correct answer is C) 800,000 cubic meters.

The scale given is for the length, width or height of the model. In order to find the scale for the volume, we would cube this scale, since volume is a cubic measurement:
(1/200)³ = 1/8,000,000

Since the volume of the model is 0.1, we multiply this by 8,000,000 to find the volume of the actual dam:
0.1(8000000) = 800,000

4 0

2 years ago