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3 years ago

2 times 2.1-(2.8 times 1.5)

Mathematics

1 answer:

natali 33 [55]3 years ago

5 0

The simplest answer is 0 if u actrually do the work if u have to sneak a calculator in XD

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Which of the following weights would you expect to be suitable for weighing on an ordinary bathroom scale?

Ierofanga [76]

Answer:

c) $4.10^{6} cg$ =40Kg

Step-by-step explanation:

To find the answer we have to put all the options in the same unit, so we are going to use Kg.

a) 2500 μg

μ $=1.10^{-6}$

Replacing the value of μ:

$2500.1.10^{-6} g=\\ 2500.10^{-6} g$

<u><em>Observation:</em></u> 1 g = 0.001 Kg, 1 g= $1.10^{-3}$ Kg

$2500.10^{-6} g=\\ =2500.10^{-6}.10^{-3}Kg\\=2500.10^{-9}Kg$

$2500.10^{-9}Kg=0.000002500 Kg$

This number is very small so it's no suitable for weighing on an ordinary bathroom scale.

b) $5.10^{-4}Kg$

This value is already in kilograms,

$5.10^{-4} kg=0,0005 Kg$

But it's small. It's not suitable for weighing on an ordinary bathroom scale.

c) $4.10^{6} cg$

Centigrams: cg= $1.10^{-5} Kg$

Then,

$4.10^{6} cg=4.10^{6}.10^{-5}Kg\\ =4.10^{1} Kg\\ =40 Kg$

This value it's suitable for weighing on an bathroom scale.

d) $5,5.10^{8} dg$

Decigrams: dg= $1.10^{-4} Kg$

Then,

$5,5.10^{8} dg=5,5.10^{8}.10^{-4}Kg\\ =5,5.10^{4} Kg\\ =55000 Kg$

This value is too big for a bathroom scale. Usually the limit for an ordinary bathroom scale is between 140-150 Kgs.

e) $2,0.10^{7} mg$

Miligrams: mg= $1.10^{-6} Kg$

Then,

$2,0.10^{7} mg=2,0.10^{7}.10^{-6}Kg\\ =2,0.10^{1} Kg\\ =20 Kg$

This could be a right answer too but it all depends on the scale. There are some scales whose minimum weight is 30Kg. So the right answer is c)

5 0

4 years ago

Which of the value of x satisfies the equation below -2x-7=12

Masteriza [31]

Answer is A.
You start by adding the 7 to the opposite side. Giving you 19. You divide both sides by -2 which gives you x on one side and -9.5 on the other.

-2x-7=12
-2x=12(+7)
-2x=19
x=19/-2
x=-9.5

8 0

3 years ago

Hello nice people of the world, I just wanted tell you to have a great day! (p.s. can u answer this plz)

Alika [10]

Answer:

Option B

Step-by-step explanation:

The coordinates are (-1,8) and (3,-4)

Slope = $\frac{rise}{run}$

Slope = $\frac{-4-8}{3+1}$

Slope = $\frac{-12}{4}$

Slope = -3

7 0

4 years ago

Read 2 more answers

James is putting a fence around his square yard. The area of his yard is 100 square feet. How much fencing does James need in to

gtnhenbr [62]

Answer:

40 ft.

Step-by-step explanation:

Because James's yard is a square, we can take the square root of the area to find the side length. The square root of 100 is 10, so we know that one side of his yard will require 10 feet of fencing. Since the yard has 4 sides, we simply need to do 4 * 10 = 40 ft of fencing.

Hope this helps!

3 0

3 years ago

The circumference of a circle is 24 pi cm. What is the exact area of the circle?

makvit [3.9K]

144pi
becous the radius is 24pi/(pi*2) and thet is 12
now 12²*pi is 144pi

3 0

3 years ago

Read 2 more answers