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3 years ago

11

Change .00345 to a percent. A) .345% B) 3.45% C) 34.5% D) 345%

2 answers:

natali 33 [55]3 years ago

7 0

Answer:

A

Step-by-step explanation:

When converting from a decimal to a percent, you always multiply the decimal by 100, and in this case, multiplying the number 0.00345 gets us 0.345. This number is the percent, in this case 0.345%, or answer choice A.

Natasha2012 [34]3 years ago

5 0

Answer:

0.345%

Step-by-step explanation:

you multiply is by 100

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A sphere is inscribed in a cylinder. Use complete sentences and geometric formulas to compare the surface area of the sphere and

Papessa [141]

Answer:

1 : 1

Step-by-step explanation:

When a circle is inscribed in a cylinder, the height of the cylinder is equal to the diameter of the sphere and the radius of the cylinder is same as that of the sphere.

Let the radius of sphere is r.

height of cylinder, h = 2r

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Surface area of sphere, A = 4πr²

lateral surface area of cylinder, A' = 2 πrh

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The ratio of surface area of sphere to the lateral surface area of cylinder is 1 : 1.

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3 years ago

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Step-by-step explanation:

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The sum of a positive number and 22 is 455 times the reciprocal of the number find the number

dalvyx [7]

Answer:

13

Step-by-step explanation:

Let the number be x.

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3 years ago

Sally finds a coin with a radius of 1.5 centimeters and a thickness of 0.25 cm. It has a measured mass of 18.54 grams. How can S

mote1985 [20]

Answer:

Silver

Step-by-step explanation:

Find the volume of the coin

<u>Volume of a cylinder</u>

$\textsf{V}=\sf \pi r^2 h \quad\textsf{(where r is the radius and h is the height)}$

Given:

r = 1.5 cm
h = 0.25 cm

Substituting given values into the formula to find the volume:

$\sf \implies V=\pi (1.5)^2(0.25)$

$\sf \implies V=0.5625 \pi \:cm^3$

Find the density of the coin given it has a measured mass of 18.54 g

<u>Density formula</u>

$\sf \rho=\dfrac{m}{V}$

where:

$\rho$ = density
m = mass
V = volume

Given:

m = 18.54 g
$\sf V=0.5625 \pi \:cm^3$

Substituting given values into the density formula:

$\implies \sf \rho=\dfrac{18.54}{0.5625 \pi}$

$\implies \sf \rho=10.49149385\:g\:cm^{-3}$

Given:

$\textsf{Density of Lead}=\sf 11.3\:g\:cm^{-3}$

$\textsf{Density of Silver}=\sf 10.49\:g\:cm^{-3}$

Therefore, as $\sf \rho=10.49\:g\:cm^{-3}$ the coin is made from silver.

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2 years ago

How many solutions does 2/3 (3x - 15) = x - 10 have?

irina1246 [14]

Answer:

2/3 [3x - 15] =x-10

open the brackets first

[2/3 x3x] -[2/3 x15 =x - 15

2x - 10 =x - 10

put the like terms together

2x -x =-10 +10

x=0

Step-by-step explanation:

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2 years ago