doorknoob

Arithmetic sequences always have the same common difference (d), each number changes by the same value

Geometric sequences have a common ratio (r). The common ratio is multiplied to every number to get the next

Neither, I am assuming that you mean that the sequence has no common ratio or difference.

(Whoops posted that twice)

You can always use these rules for each sequence to figure out which one is which.

Arithmetic sequences always have the same common difference (d), each number changes by the same value

Geometric sequences have a common ratio (r). The common ratio is multiplied to every number to get the next

Neither, I am assuming that you mean that the sequence has no common ratio or difference.

The volume of a cylinder is, pi*r^2^h, so we know that the height and radius is 10 and 20 cm, 

We can square 10 to get 100pi. then 100pi*20 would be our volume of the cylinder.

The maximum error in y calculation? Perhaps check out this link, I'm not sure what your trying to ask.

https://www.freemathhelp.com/forum/threads/maximum-error-in-calculated-surface-area-volume-of-sphere.60934/ - Sphere

https://www.physicsforums.com/threads/density-of-cylinder-error-propagation.761021/

We can take the zeroes in 10 billion and add them on to the other 10 billion to get,

10,000,000,000*10,000,000,000 = 100,000,000,000,000,000,000,000

You are not suppsed to multiply out this problem, this looks like a quadratic intercept form.

quadratic intercept form: y=a(x-p)(x-q) 

a = vertical shift/stretch

p = root/x-intercept

q = root/other x-int

Please label this as off-topic please.

You could always try symbolab or MathPapa (2 of the more popular online calculators)

Thanks!

Instead of putting this under questions, perhaps lable this as "off-topic"

As listed above, others used substitution, but you can use elimination as another way to solve it

Using substitution is easiest because it already tells you what y is in terms of x

Elimination:

We try to subtract/add the two sentences to remove the extra variable

I can multiply 3x+2y=8 by 4 to get 12x+8y=32

I can them multiply y=4x-7 by 3 to get 3y=12x-21

Now by subtracting these two sentences I can remove the x value

After I get rid of my x value, the y variable will be the only variable left, where we can now solve the Algebra equation.