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3 years ago

The differece of twice a number and five is three. Find the number

Mathematics

2 answers:

Anton [14]3 years ago

5 0

Answer:

Step-by-step explanation:

LEt the number be x.

2x - 5 = 3

2x = 3 + 5 = 8

x = 8/2 = 4

To solve the equation: add 5 to both sides and then multiply by 1/2.

Liula [17]3 years ago

5 0

let x represent the unknown number
2x-5=3
(add 5 to both sides)
2x=8
(divide by 2 on both sides)
x=4

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Write the given quadratic functions in<br> standard form:<br> y = (x - 2)(x + 4)

Annette [7]

Y= x^2+2x-8 (the x^2 is x squared)

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3 years ago

An AISI 1040 cold-drawn steel tube has an OD 5 50 mm and wall thickness 6 mm. What maximum external pressure can this tube withs

lukranit [14]

Answer:

82.79MPa

Step-by-step explanation:

Minimum yield strength for AISI 1040 cold drawn steel as obtained from literature, Sᵧ = 490 MPa

Given, outer radius, r₀ = 25mm = 0.025m, thickness = 6mm = 0.006m, internal radius, rᵢ = 19mm = 0.019m,

Largest allowable stress = 0.8(-490) = -392 MPa (minus sign because of compressive nature of the stress)

The tangential stress, σₜ = - ((r₀²p₀)/(r₀² - rᵢ²))(1 + (rᵢ²/r²))

But the maximum tangential stress will occur on the internal diameter of the tube, where r = rᵢ

σₜₘₐₓ = -2(r₀²p₀)/(r₀² - rᵢ²)

p₀ = - σₜₘₐₓ(r₀² - rᵢ²)/2(r₀²) = -392(0.025² - 0.019²)/2(0.025²) = 82.79 MPa.

Hope this helps!!

8 0

4 years ago

I need help please.

JulijaS [17]

Answer:

$\frac{7\sqrt{5} }{8}$

Step-by-step explanation:

Using the rules of radicals

$\sqrt{\frac{a}{b} }$ = $\frac{\sqrt{a} }{\sqrt{b} }$

$\sqrt{a}$ × $\sqrt{b}$ ⇔ $\sqrt{ab}$

Given

$\sqrt{\frac{245}{64} }$ = $\frac{\sqrt{245} }{\sqrt{64} }$

Simplifying the radicals

$\sqrt{245}$

= $\sqrt{5(7)(7)}$

= $\sqrt{49(5)}$

= $\sqrt{49}$ × $\sqrt{5}$ = 7 $\sqrt{5}$

and

$\sqrt{64}$ = 8

The simplified radical is

$\frac{7\sqrt{5} }{8}$

3 0

3 years ago

_________ integers are natural numbers. 1.) some 2.) all 3.) no

Marina CMI [18]

Answer:

1.) Some

Step-by-step explanation:

Natural numbers do not contain negative numbers, but they do contain whole numbers like 1, 2, 3. So your answer would be some.

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3 years ago

An equation of the form 7/8 = x/9 is called a/an_________

anygoal [31]

Answer:

Proportion.

Step-by-step explanation:

Sorry for the late answer! I hope this helps! :)

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3 years ago