3 years ago

Hello please help i’ll give brainliest

Mathematics

1 answer:

lorasvet [3.4K]3 years ago

4 0

Second one babes mwah

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Please solve the right triangle below. Round the decimals to the nearest tenth.

aniked [119]

Find $AB$ using Pythagorean Theorem,

$AB=\sqrt{12^2+9^2}=15$ .

$A=\tan^{-1}(12/9)=53.1^{\circ}$ .

$B=\tan^{-1}(9/12)=36.9^{\circ}$ .

Hope this helps.

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3 years ago

Scientific notation

tatuchka [14]

Answer:

1.45

Step-by-step explanation:

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4 years ago

Compute the loss of head and pressure drop in 200 ft of horizontal 6-in diameter asphalted cast iron pipe carrying water with a

laiz [17]

Answer:

The answer is below

Step-by-step explanation:

12 inches = 1 ft.

6 inches = 6 inches * (1 ft./12 inches) = 0.5 ft.

Therefore the diameter of the cast iron (D) = 6 inches = 0.5 ft.

The area of cast iron (A) = πD²/4 = π(0.5)²/4 = 0.196 ft²

The velocity (V) = 6 ft./s, the acceleration due to gravity (g) = 32.2 ft./s²

ε/D = 0.0004 ft./ 0.5 ft. = 0.0008

Using the moody chart, find the line ε/D = 0.0008 and determine the point of intersection with the vertical line R = 2.7 * 10⁵. Hence we get f = 0.02.

The head loss (h) is:

$h_f=f*\frac{L}{d}* \frac{V^2}{2g}=0.02*\frac{200\ ft}{0.5\ ft} *\frac{(6\ ft/s)^2}{2*32.2\ ft/s^2}=4.5\ ft$

The pressure drop (Δp) is:

Δp = ρg $h_f$ = $(62.4\ lbf/ft^3)(4.5\ ft)= 280\ lbf/ft^2$

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3 years ago

A man ordered 4 times as many boxes of ballpoint pens as boxes of felt-tip pens. Ballpoint pens cost $4.41 per box, and felt-tip

natka813 [3]

Answer:

Step-by-step explanation:

Let x = # of boxes of felt-tip pens.

(x)(3.44)+(4x)(4.41) = 63.24

21.08x = 63.24

x = 3

Because x = 3, the man bought 3 boxes of felt-tip pens and 12 boxes of ballpoint pens.

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2 years ago

Please help me please !! The answer isn’t a!

jenyasd209 [6]

Answer:

Step-by-step explanation:

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3 years ago