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3 years ago

Help me plzzzzzzzZzzzzz

Mathematics

1 answer:

gizmo_the_mogwai [7]3 years ago

8 0

Use order of operations.

-23-20-(-17)+(-5)x(-2)+4x5

Do all multiplication steps.

-23-20-(-17)+10+20

Do all addition and subtraction steps fro left to right.

-43-(-17)+10+20

-26+10+20

-16+20

answer: 4

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Given f(x)=2x-8, find f(3)

IgorLugansk [536]

F(3)=2*3-8=-2.
Hope that helps.

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2 years ago

How much pure water must be mixed with 10 liters of a 25% acid solution to reduce it to a 10% acid solution.

Nadya [2.5K]

The answer is B

15 L of pure water must be mixed with 10 L of a 25% acid solution to reduce it to a 10% acid solution

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3 years ago

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Answer.

Neporo4naja [7]

Answer:

a. all matter is made of atoms

b. atoms are indivisible and indestructible

c. atoms of given elements are identical in mass and properties

d. compounds are combination of 2> different types of atoms

2. it's called Planetary model

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2 years ago

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Simplify<br> Enter answer in box:

lesantik [10]

(3/5 + -1/4)/(7/10)

get a common denominator of 20

3/5 * 4/4 =12/20

-1/4 * 5/5 = -5/20

7/10 *2/2 = 17/20

replace

(12/20 - 5/20)/(14/20)

add the top

(7/20)/(14/20)

copy dot flip

7/20 * 20/14

7/14

1/2

7 0

2 years ago

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The radius r(t)r(t)r, (, t, )of the base of a cylinder is increasing at a rate of 111 meter per hour and the height h(t)h(t)h, (

sp2606 [1]

Answer:

The volume is decreasing at a rate 20π cubic meter per hour.

Step-by-step explanation:

We are given the following in the question:

The radius is increasing at a rate 1 meter per hour.

$\dfrac{dr}{dt} = 1\text{ meter per hour}$

The height is decreasing at a rate 4 meter per hour

$\dfrac{dh}{dt} = -4\text{ meter per hour}$

At an instant time t,

r = 5 meter

h = 8 meters

Volume of cylinder =

$\pi r^2 h$

where r is the radius and h is the height of the cylinder.

Rate of change of volume is given by:

$\dfrac{dV}{dt} = \dfrac{d(\pi r^2 h)}{dt}\\\\\dfrac{dV}{dt} = 2\pi rh\dfrac{dr}{dt} + \pi r^2\dfrac{dh}{dt}$

Putting all the values we get,

$\dfrac{dV}{dt} = 2\pi (5)(8)(1) + \pi (5)^2(-4)\\\\\dfrac{dV}{dt} = 80\pi - 100\pi = -20\pi \approx -62.8$

Thus, the volume is decreasing at a rate 20π cubic meter per hour or 62.8 cubic meter per hour.

3 0

3 years ago

Help me plzzzzzzzZzzzzz​

Help me plzzzzzzzZzzzzz