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Alika [10]
3 years ago
14

Round the quantity to the given place value 13.989 to the nearest ten

Mathematics
1 answer:
mixer [17]3 years ago
7 0

Answer: no answer

Step-by-step explanation

sorry no answer bye

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Helium is used for balloons because it is less dense than air. This is what allows helium balloons to rise. Suppose a helium- ai
Kay [80]

Answer: Option A

About 0.02 pounds

Step-by-step explanation:

We know that density is defined as:

d = \frac{m}{v}

Where

d is the density

m is the mass

v is the volume

We want to calculate the helium-air mass of a spherical balloon and we know its density and the diameter of the balloon.

Then we can calculate its mass.

1) We use the diameter of the spherical globe to calculate its volume.

The volume of a sphere is:

V = \frac{4}{3}\pi r ^ 3

and

radius = \frac{diameter}{2}

So

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

V= 0.5236\ ft^3

2) Use the density formula to find the mass

d = \frac{m}{v}

m = vd

m = (0.5236\ ft^3)*(0.04\ \frac{pound}{ft^3})\\\\m = 0.02\ pounds

<em>The answer is 0.02 pounds</em>

5 0
3 years ago
Pls help me I’m stressed out ill give out brainliest please dont answer if you don’t know
DerKrebs [107]

Answer:

x=0.4

Step-by-step explanation:

combine like terms

7x+8 = 12 - 3x

10x = 4

divide both sides by 10

x=4/10

x=2/5

if you want a decimal, x=0.4

4 0
3 years ago
In one U.S.​ city, the quadratic function f (x )equals 0.0039 x squared minus 0.42 x plus 36.79 models the​ median, or​ average,
Leviafan [203]

Answer:

The average age was minimum at 1954 and the average age is 25.5.

Step-by-step explanation:

The given quadratic function is

f(x)=0.0039x^2-0.42x+36.79

It models the​ median, or​ average, age,​ y, at which men were first married x years after 1900.

In the above equation leading coefficient is positive, so it is an upward parabola and vertex of an upward parabola, is point of minima.

We need to find the year in which the average age was at a minimum​.

If a quadratic polynomial is f(x)=ax^2+bx+c, then vertex is

Vertex=(-\dfrac{b}{2a},f(-\dfrac{b}{2a}))

-\dfrac{b}{2a}=-\dfrac{(-0.42)}{2(0.0039)}=53.846153\approx 54

54 years after 1900 is

1900+54=1954

Substitute x=54 in the given function.

f(54)=0.0039(54)^2-0.42(54)+36.79=25.4824\approx 25.5

Therefore, the average age was minimum at 1954 and the average age is 25.5.

8 0
3 years ago
How do you do this? Explanation please #46
Charra [1.4K]
8 3/4 times. Hope this helps :)
6 0
4 years ago
How many terms are in the following expression? - 2y + 3x + 7z - 4​
brilliants [131]

Answer:

3x-2y+7z-4

Step-by-step explanation:

Reorder -2y+7z-4

3 0
3 years ago
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