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3 years ago

All circles are _____ to each other. congruent concentric parallel similar

Mathematics

2 answers:

docker41 [41]3 years ago

7 0

The answer is similar because paraell is lines and not all circles are congruent

fomenos3 years ago

5 0

Answer:

All circles are similar to each other.

Step-by-step explanation:

Circles are congruent if they have the same radius, regardless of where their centers are located.

Then all circles can't be congruent, because not all of them have the same radius.

Circles are concentric if they have the same center. And not all circles have the same center.

And circles can't be parallels. Parallelism is a relationship that is established between lines or planes.

Then, the correct option is all circles are similar to each other. They all have the same shape although they can be of different sizes, have different centers, and different radius.

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Which of these describes an angle?

stealth61 [152]

A part of a line that connects two endpoints I believe

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3 years ago

Kong makes $14.25 per hour. If he works a 40-hour week, how much does he have to pay into FICA (7.65%)?

gizmo_the_mogwai [7]

Amount of FICA to be paid
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3 years ago

The sign of the product of two integers with the same sign is positive. What is the sign of three integers with the same sign? E

Svetradugi [14.3K]

Can be both, because if all three were negative, it would be

negative*negative= positive
positive*negative=negative
example: -1*-1*-1=-1

but if all three were positive, it would obviously be positive, because any number of positives can't make negatives in multiplication.

4 0

4 years ago

0.2x + 1 = 1.6x + 3.1 What value of x satisfies the equation above?

guapka [62]

Answer:

x = -1.5

General Formulas and Concepts:

Pre-Alg

Order of Operations: BPEMDAS
Equality Properties

Step-by-step explanation:

Step 1: Define equation

0.2x + 1 = 1.6x + 3.1

Step 2: Solve for x

Subtract 0.2x on both sides: 1 = 1.4x + 3.1
Subtract 3.1 on both sides: -2.1 = 1.4x
Divide both sides by 1.4: -1.5 = x
Rewrite: x = -1.5

Step 3: Check

Plug in x to verify it's a solution.

Substitution: 0.2(-1.5) + 1 = 1.6(-1.5) + 3.1
Multiply: -0.3 + 1 = -2.4 + 3.1
Add: 0.7 = 0.7

5 0

3 years ago

Read 2 more answers

Water is drained out of tank, shaped as an inverted right circular cone that has a radius of 4cm and a height of 16cm, at the ra

bearhunter [10]

Answer:

$\frac{dh}{dt}=-\frac{1}{2\pi}cm/min$

Step-by-step explanation:

From similar triangles, see diagram in attachment

$\frac{r}{4}=\frac{h}{16}$

We solve for $r$ to obtain,

$r=\frac{h}{4}$

The formula for calculating the volume of a cone is

$V=\frac{1}{3}\pi r^2h$

We substitute the value of $r=\frac{h}{4}$ to obtain,

$V=\frac{1}{3}\pi (\frac{h}{4})^2h$

This implies that,

$V=\frac{1}{48}\pi h^3$

We now differentiate both sides with respect to $t$ to get,

$\frac{dV}{dt}=\frac{\pi}{16}h^2 \frac{dh}{dt}$

We were given that water is drained out of the tank at a rate of $2cm^3/min$

This implies that $\frac{dV}{dt}=-2cm^3/min$ .

Since we want to determine the rate at which the depth of the water is changing at the instance when the water in the tank is 8cm deep, it means $h=8cm$ .

We substitute this values to obtain,

$-2=\frac{\pi}{16}(8)^2 \frac{dh}{dt}$

$\Rightarrow -2=4\pi \frac{dh}{dt}$

$\Rightarrow -1=2\pi \frac{dh}{dt}$

$\frac{dh}{dt}=-\frac{1}{2\pi}$

3 0

4 years ago

Read 2 more answers