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Alexxandr [17]
3 years ago
11

A number

Mathematics
1 answer:
eimsori [14]3 years ago
8 0

Answer:

let the unit digit be x

and the tens digit be y

so x+y = 9 ---> y = 9-x

the number is 10y+x

the number reversed is 10x + y

3(10y+x) = 8(10x + y)

30y + 3x = 80x + 8y

22y = 77x

2y = 7x

2(9-x) = 7x

18 - 2x = 7x

18=9x

x=2

y=7

the number is 72

check:

number is 72

reverse is 27

is 3(72) = 8(27)

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8 thousandths + 6 ones 8 thousandths= how many thousandths?
inna [77]

Consider 8 thousandths + 6 ones 8 thousandths

We have to determine the number of thousandths in the given number sentence.

8 thousandths = 0.008

6 ones 8 thousandths = 6.008

8 thousandths + 6 ones 8 thousandths = 0.008 + 6.008

= 6.016

So, the sum is 6.016

Therefore, there are 6 thousandths in the sum of the given numbers.

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Step-by-step explanation:

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El largo de una sala es 2 metros más grande que su ancho. El área es de 80 m?. ¿Cuánto mide de largo? Cuánto mide de ancho?​
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Answer: Translation:  

The length of a room is 2 meters greater than its width. The area is 80 m ?. How long is it? How wide is it?

Step-by-step explanation:

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A local food mart donates 15% of its Friday sales to a charity. This Friday, the food mart had sales totaling $380.00. How much
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Find the surface area of a sphere that has a volume of 288 cu. in.
LenKa [72]

The formula of a volume of a sphere:

V=\dfrac{4}{3}\pi R^3

R - radius

We have the volume = 288 in³. Substitute:

\dfrac{4}{3}\pi R^3=288\qquad\text{multiply both sides by 3}\\\\4\pi R^3=864\qquad\text{divide both sides by}\ 4\pi\\\\R^3=\dfrac{216}{\pi}\to R=\sqrt[3]{\dfrac{216}{\pi}}\\\\R=\dfrac{\sqrt[3]{216}}{\sqrt[3]{\pi}}\\\\R=\dfrac{6}{\sqrt[3]{\pi}}\ in

The formula of a surface area of a sphere:

S.A.=4\pi R^2

Substitute:

S.A.=4\pi\left(\dfrac{6}{\sqrt[3]{\pi}}\right)^2=4\pi\cdot\dfrac{6^2}{\sqrt[3]{\pi^2}}=\dfrac{4\pi\cdot36}{\sqrt[3]{\pi^2}}=\dfrac{144\pi}{\sqrt[3]{\pi^2}}\\\\S.A.=\dfrac{144\pi}{\sqrt[3]{\pi^2}}\cdot\dfrac{\sqrt[3]{\pi}}{\sqrt[3]{\pi}}=\dfrac{144\pi\sqrt[3]{\pi}}{\sqrt[3]{\pi^3}}=\dfrac{144\pi\sqrt[3]{\pi}}{\pi}=\boxed{144\sqrt[3]{\pi}\ in^2}

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