i have a question

Answer 1

ok

Does this...

(AX + B)(C - D)

when you multiply

the first numbers... AX and C

mean the same thing as

(AX)C -D(AX) +BC -BD

or this

AXC - DAX + BC - BD

which one is it???

Answer 2

it may not make a difference but I'm doing a physics problem were it does...

(180 s)(a t3)

were s is seconds and 3 is just a subscript...

does that equal

(180 s)a + (180 s)t3

or this

180 s * a * t3

which one is correct?

Answer 3

(AX)C -D(AX) +BC -BD

or this

AXC - DAX + BC - BD

which one is it???
These two are the same thing.

What you have written for the others one is not.
(180 s)a + (180 s)t3

or this

180 s * a * t3
These two expressions are NOT the same.
(180s)a + (180s)t3 =
180s*a + 180st3.

Answer 4

which expression is correct from this

180 s(a t3)

THIS ONE???
(180 s)a + (180 s)t3

or this ONE???
180 s * a * t3

Answer 5

it depends on whether (a t3) is (a*t3) or if it is (a+t3.)if (180s) is one term as well then. your expansions are either
for (a*t3)(1) 180s*a*t3 or
for (a+t3)(2) (180s*a)+(180s*t3)

Answer 6

180 s(a t3)
This means 180*s(a*t3) which is the same as
180*s*a*t3