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3 years ago

B. If some amount of water contains 1400 oxygen atoms, how many hydrogen atoms does it contain?

Mathematics

1 answer:

Genrish500 [490]3 years ago

5 0

Answer:

B: 2800 hydrogen atoms

C: 6760 hydrogen atoms

D: y=amount of oxygen atoms*2

Step-by-step explanation:

B: We know the formula for water is H2O. SO that means that there is 2 hydrogen atoms and 1 oxygen atom. So there is 2 times the amount of hydrogen atoms so we can do 1400*2=2800, So there is 2800 hydrogen atoms in the water.

C: Same thing as B. 3380*2=6760

D: y=amount of oxygen atoms*2. Because there is one oxygen atom and two hydrogen atoms so 1*2=2.

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Eight gardeners equally share 1/2 of a pile of pine needles. What fraction of the pile does each gardener receive?

Tpy6a [65]

Answer:

Each gardner will get 1/16 of a pile of pine needles.

Step-by-step explanation:

1/2 ÷ 8

*Switch the division to multiplication and flip the 8 (or 8/1) upside-down.

= 1/2 · 1/8

= 1/16

3 0

3 years ago

Y = (25 - 2) (35 - 2). Multiply the binomials.

Dima020 [189]

Answer: y=759

Step-by-step explanation:

y = (25 - 2) (35 - 2)

y = (23) (33)

y = 759

5 0

3 years ago

Read 2 more answers

10) The line FG is a diameter of the circle with centre C (6, 1). Given F is (2.-3), find the coordinates of G.

Maurinko [17]

Answer:

Coordinates of the endpoint g is (10,5)

Step-by-step explanation:

The coordinates of a midpoint can be found using the formula;

(x,y) = (x1 + x2)/2 , (y1 + y2)/2

In this case, we have the mid point but we want to get the end point

Thus;

(6,1) = (x1 + 2)/2 , (y1-3)/2

x1 + 2 = 2(6)

x1 + 2 = 12

x1 = 12-2

x1 = 10

y1 - 3 = 2(1)

y1 -3 = 2

y1 = 2 + 3

y1 = 5

The coordinates of G are (10,5)

6 0

3 years ago

Please help why is d a angle

saw5 [17]

Here is your answer

Both

a) /_D

c) /_ADB

are correct

REASON:

/_ADB represents an angle between AD and BD which is marked in the question.

/_D represents the point where the two lines or rays have a common point, i.e.D

[However writing a single letter to represent an angle is not completely correct. But when there is only one angle represented through the point then writing a single letter is correct

i.e. /_D is correct ]

HOPE IT IS USEFUL

5 0

3 years ago

Draw a quadrilateral ABCD with AB = 8.5cm, BC =4.5cm, CD =5cm , DA = 6cm , BD =7.5cm. Draw an equal area Triangle

irina1246 [14]

Answer:

Check below please

Step-by-step explanation:

A quadrilateral is a polygon with four sides.

Then let's plot it, check it below.

1) Since 5 line segments were given for a quadrilateral, one of them is an interior one. In this quadrilateral, a rhombus. We have a diagonal, id est a line segment between non-consecutive points.

2) Let's calculate the area of this rhombus. Since this polygon is made up of two triangles let's find it using Heron's Formula, not very popular. But equally valid, also we don't have the height nor angles.

All we need is the semi-perimeter, (half of the Perimeter (2P) and plug it in the formula:

$\bigtriangleup ABD semi-perimeter:\frac{6+8.5+7.5}{2} \therefore s=11\\Area \:\bigtriangleup ABD=\sqrt{11(11-6)(11-8.5)(11-7.5)}=\frac{5\sqrt{77}}{2} \approx21.94 cm\\\\\bigtriangleup \:BCD\: semi-perimeter:\frac{4.5+5+7.5}{2} \therefore s=8.5\\\\Area \bigtriangleup BCD=\sqrt{8.5(8.5-4.5)(8.5-5)(8.5-7.5)}=\sqrt{119}\approx 10.90$

$Area\: of\: Rhombus\: ABCD=21.94+10.90=32.84 cm^2$

3) Well, now we need to trace a triangle whose area is 32.84 cm^2. From the classical formula for Area of Triangles we can write:

$\frac{b*h}{2}=32.84 \therefore b*h=65.68$

Let's find out two values one for the base and another for height. Since 65.58 can be divided both by two and three, it is divisible by 6.

$65.58 : 6 =10.93\\b=6\\h=10.93$

5 0

3 years ago