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3 years ago

If a – 2 = -12, then a = ______.

Mathematics

2 answers:

nata0808 [166]3 years ago

6 0

A=-10 all you do to find a is simply add 2 to both sides of the equal sign

blondinia [14]3 years ago

4 0

Answer:

a= -10

Step-by-step explanation:

To do this you would need to isolate a, or make a stand alone on its side of the equation

a-2=-12 Original equation

a-2+2 = -12+2 Isolating the variable(adding the 2 will cancel the -2 on the left side of the equation)

a= -12+2 Simplification

a= -10 The answer!!!

I hope this helps!!!

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What is the mass of a solid ball of iron with a radius equal to 18 cm if it is known that the density of iron is 7800 kg/m

Shtirlitz [24]

Answer:

60.6528 kg

Step-by-step explanation:

Assuming the solid ball of iron is a sphere with a radius of 18 cm (or 0.18 m), we can compute the volume of the sphere:

$V=\frac{4}{3}\pi r^3\\\\V=\frac{4}{3}\pi (\frac{18}{100})^3\\\\V=\frac{4}{3}\pi (0.005832)\\\\V=0.007776$

Therefore, the volume of the solid ball is 0.007776 m³

Since we know that density is mass/volume, then we can find the mass of the iron:

$\rho=\frac{mass}{volume}\\ \\7800\: kg/m^3=\frac{mass}{0.007776\: m^3}\\\\mass=60.6528\:kg$

Thus, the mass of the solid ball of iron is 60.6528 kg

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Step-by-step explanation:

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2 years ago

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3 years ago

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