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3 years ago

Round to the nearest ten for 2,420

Mathematics

2 answers:

kotykmax [81]3 years ago

5 0

I'm pretty sure it's just 2,420.

melamori03 [73]3 years ago

3 0

2,420 because 2 is is in the tenth place and the number after that is 0

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HELP!!!!!!!!!!!!!!!!!!!!!!!!!! Can U Answer All These.

mash [69]

QUESTION 1

In figure A, the area of the bigger square is $625\:units^2$ . This means that the length of this square is the hypotenuse of the right angle triangle formed, which is $25\:units$ .

The area of the two smaller squares are $576\:units^2$ and $49\:units^2$ .

The length of these two squares form the two shorter legs of the right angle triangle, which are $24$ and $7$ units respectively.

Therefore we can write the equation, $576+49=625$ .

This implies that, $24^2+7^2=25^2$

We can see that the sum of the squares of the two shorter legs equals the square of the longer side which is the hypotenuse and this what the Pythagoras theorem says.

But in fig. B,

$5^2+4^2\ne 6^2$

Therefore the correct answer is Fig A.

QUESTION 2

See diagram.

We introduce the two lines as shown in the diagram.

From Pythagoras' Theorem,

$|AB|^2=|AC|^2+|BC|^2$

But $|AC|=|7-3|=4$ units.

and

$|BC|=|8-2|=6$ units.

This implies that,

$|AB|^2=4^2+6^2$

$|AB|^2=16+36$

$|AB|^2=52$

$|AB|=\sqrt{52}$

$|AB|=2\sqrt{13}$

$|AB|=7.2$ to the nearest tenth.

QUESTION 3

The numbers $3,4$ and $5$ form a Pythagorean triplet because $3^2+4^2=5^2$ .

If these numbers represent the side lengths of a triangular fence, then the triangular fence must be a right angle triangle.

The correct answer is B

Yes,because $3^2+4^2=5^2$ .

QUESTION 4

See graph.

We want to find the image of the triangle with vertices A(-5,-4), B(-2,-4), and C(-5,-1) after a reflection in the x-axis.

The mapping for this transformation is

$P(x,y)\rightarrow P'(x,-y)$ .

We just have to negate the y-coordinates.

$A(-4,-5)\rightarrow A'(-4,5)$ .

$B(-4,-1)\rightarrow B'(-4,1)$ .

$C(-5,-1)\rightarrow C'(-5,1)$ .

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3 years ago

Using synthetic divison, what is the quotient of this expression? 2x^2+5x-7 over x-2

a_sh-v [17]

Answer:

A. 2x + 9 + 11 over x - 2

Step-by-step explanation:

2x^2+5x-7 over x-2

divide - 2x^2 + 5x - 7 over x - 2 = 2x + 9x - 7 over x - 2

= 2x + 9x - 7 over x - 2

divide - 9x - 7 over x - 2 = 9 + 11 over x - 2

= 2x + 9 + 11 over x - 2

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3 years ago

The radius of Mars is about 3.4 times 10^3 km. What is the approximate surface area of Mars? Use the formula for the surface are

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Answer: the answer is a hard doosie

Step-by-step explanation:

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2 years ago

A surveyor measures the angle of elevation to a point on a mountain to be 12 degrees. The point on the mountain is horizontally

olchik [2.2K]

From the right triangle formed, the adjacent side to the angle of elevation is 5 miles and the vertical change in elevation is the opposite side. From the trigonometric function, tangent of an angle,
tan 12° = x / 5 miles
The value of x from the equation is 1.06 miles. Thus, the vertical change in elevation is 1.06 miles.

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3 years ago

Read 2 more answers

£150 is divided between David, Mark & Henry so that David gets twice as much as Mark, and Mark gets three times as much as H

Sauron [17]

Answer:

David receives £90

Step-by-step explanation:

Let David's share be D

Let Mark's share be M

Let Henry's share be H

From the question, we obtained the following data:

David gets twice as much as Mark i.e

D = 2M

M = D/2

Mark gets three times as much as Henry i.e

M = 3H

H = M/3

H = (D/2) /3

H = D/6

The sum of their shares is £150 i.e

D + M + H = 150

D + D/2 + D/6 = 150

Multiply through by 6 to clear the fraction

6D + 3D + D = 900

10D = 900

Divide both side by the coefficient of D i.e 10

D = 900/10

D = 90

Therefore, David receives £90

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3 years ago