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4 years ago

PLEASE HELP ME!!!!!!

Mathematics

1 answer:

MA_775_DIABLO [31]4 years ago

5 0

I think the one to the top right, it makes sense but I'm not absolutely sure :(

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A number < 50 that is divisible by 1,2,3,5 and 10?

jeka57 [31]

30 fits those requirements

7 0

3 years ago

If the sum of two numbers is 15 and their quotient is 4, what are they?

11Alexandr11 [23.1K]

Answer:

3, 12

Step-by-step explanation:

"x" is the larger number,

"y" is the smaller number.

Given

x + y = 15

x / y = 4

manipulate the equations for the problem

x / y = 4

*y *y

x = 4y

solve the system of equations by the methord of substitution:

x + y =15

4y + y = 15

5y = 15

y = 3

Subsitute back into the equations given.

x = 4y

x = 12

6 0

3 years ago

<img src="https://tex.z-dn.net/?f=%20%5Csqrt%7B%20%5Cfrac%7B64%7D%7B25%7D%20%7D%20" id="TexFormula1" title=" \sqrt{ \frac{64}{25

Svet_ta [14]

$\sqrt{\dfrac{64}{25}} = \sqrt{\dfrac{8^2}{5^2}} = \dfrac 8 5$

3 0

4 years ago

A metal pipe is 70 cm in length. Its internal radius is 12mm and thickness is 1mm. If 1mm^3 of the metal weighs 0.05 gm, what is

Free_Kalibri [48]

Step-by-step explanation:

we have to calculate the volume of 2 pipes, actually.

the inner, empty volume of the pipe with radius of 12mm.

and the complete pipe volume including the pipe wall, which adds 1mm to the radius (12+1 = 13mm).

and then we need to subtract the volume of the inner, hole part from the general pipe volume.

and that is then the volume of the actual pipe material, which we will then "translate" to weight based on the given ratio of 1/0.05 mm³/gm

so, what is the volume of a pipe ? it is actually a cylinder. it has a circular base area, and the length is, of course, the height.

the area of a circle is pi×r².

and the cylinder volume is base area times height :

pi×r²×height

also to remember : 1cm = 10mm

so, length = height = 70×10 = 700mm.

it is always important to use the same dimension of numbers when combining them in a calculation.

Vi (inner volume) = pi×12²×700 mm³ = pi×144×700 mm³

Vt (total volume) = pi×13²×700 mm³ = pi×169×700 mm³

Vt- Vi = (169 - 144)×pi×700 = 25×pi×700 mm³ =

= 54,977.87144 mm³

now, to the weight.

1 mm³ weighs 0.05 gm.

but we have not 1 but 54,977.87144 mm³.

so, we need to multiply 0.05 by the amount of mm³ to get the total weight.

0.05×54,977.87144 = 2,748.893572 gm

the pipe weighs 2748.89 gm or 2.75 kg (1kg = 1000gm).

6 0

3 years ago

Clarence measures the diameter of each tennis ball and a bag with a standard ruler. Unfortunately he uses the ruler and correctl

ollegr [7]

Refer to the figure below.

Assume that there are n correct measurements
$x_{i} , \, i=1,2, \, ... \, n$
Because each measurement has an error of 0.2 in, the actual measurements are
$x_{i} + 2$

From the figure, the analysis indicates that the correct mean is
μ = 3 in = 3*2.54 cm = 7.62 cm
The correct standard deviation is
2.934 in = 2.934*2.54 cm = 7.45 cm

Answer:
μ = 7.62 cm
σ = 7.45 cm

7 0

3 years ago