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3 years ago

Can someone help me pls

Mathematics

2 answers:

creativ13 [48]3 years ago

8 0

Answer:

52°

Step-by-step explanation:

BC is the radios so BC is perpendicilar to AC.

mBCA = 90°

<A = 180 - <B - <C

<A = 180 - 38 - 90 = 52°

Serggg [28]3 years ago

4 0

Answer:

∠ A = 52°

Step-by-step explanation:

The angle between the tangent and the radius at the point of contact C is 90°

Then Δ ABC is right.

∠ A = 180° - (90 + 38)° ← sum of angles in a triangle

∠ A = 180° - 128° = 52°

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Calculate the circumference of the circles with the following dimensions.

creativ13 [48]

Answer:

BELOW

Step-by-step explanation:

1) C= PD so

a) 12.56

b) 18.84

c) 37.68

2) C=2PR so

a) 2*3.14*2= 12.56

b) 2*3.14*14= 87.92

c) 2*3.14*12= 75.36

3) C=2PR so

a) 56.52

b) 69.08

c) 43.96

a) 31.4

b) 56.52

c) 40.82

3 0

3 years ago

Luca is 9 years old and 129 cm tall.Medical charts show that a Boy’s height at age 9 is 3/4 of his predicted adult height.Predic

Arlecino [84]

About 172 centimeters tall.

Since he is about 3/4 his average adult height, you simply divide his current height by .75

129/.75 = 172

6 0

3 years ago

Read 2 more answers

Calculate the integral s f · ds, where s is the entire surface of the solid half ball x2 + y2 + z2 ≤ 1, z ≥ 0, and f = (x + 3y5)

SSSSS [86.1K]

The divergence theorem applies since $\mathcal S$ is a closed surface. We have

$\displaystyle\iint_{\mathcal S}\mathbf f(x,y,z)\cdot\mathrm d\mathbf S=\iiint_{\mathcal V}\nabla\times\mathbf f(x,y,z)\,\mathrm dV$

where $\mathcal V$ is the space enclosed by the surface $\mathcal S$ . The divergence of the given vector field is

$\nabla\times\mathbf f(x,y,z)=\dfrac{\partial(x+3y^5)}{\partial x}+\dfrac{\partial(y+10xz)}{\partial y}+\dfrac{\partial(z-xy)}{\partial z}=1+1+1=3$

So we can write the volume integral (in spherical coordinates) as

$\displaystyle3\iiint_{\mathcal V}\,\mathrm dV=3\int_{\varphi=0}^{\varphi=\pi/2}\int_{\theta=0}^{\theta=2\pi}\int_{\rho=0}^{\rho=1}\rho^2\sin\varphi\,\mathrm d\rho\,\mathrm d\theta\,\mathrm d\varphi=\frac{4\pi}3$

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3 years ago

Marta is making two different charms for necklace one charm has a 1 cm diameter and a 3.14 cm circumference of a similar charm h

EastWind [94]

From what I can pick up from your problem statement, you want to know "<span>a similar charm has a diameter of 4 cm what is the circumference." Please, would you use proper punctuation in your writing, for greater clarity:

"A</span><span> similar charm has a diameter of 4 cm. What is the circumference?"

The formula for the circumference of a circle, when the diameter is known, is

C=</span> $\pi$ d or C=pi*d

In this case, with diamter 4 cm, the circumference, C, is 4pi cm.

3 0

4 years ago

If, for a random sample of 16 days, the sample mean ends up being exactly one standard deviation of x above the population mean,

Rudik [331]

Answer:

The answer to the question is

μx + (σx/4)

Step-by-step explanation:

The sample mean that is one standard deviations above the population mean is given by

value = μx + (Number of standard deviations)

(σx/√n)

value = μx + 1 (σx/√16)=

= μx + (σx/4) =

Where

μx = Population mean

σx = Population standard deviation

n = Sample size

The standard error of the mean is

σ/√n =σ/√16 = σ/4

The standard of error is an indication of the expected error in the mean of a sample from the mean of the population.

The above statements is based on the central limit theorem, which states that, in particular instances the normalized sum of independent random variables becomes closer and closer to those of normal distribution regardless of the variation in the sample of the variables

8 0

3 years ago