Anybody good at math please help.?

Question

i have a bunch of math problems that i don't understand. if anyone can help it would be greatly apprecitiated.
Solve the given formula for the variable:
S=n/2(a+1) ; n

A=P(1+rt) ; r

a= v-u/t ; v

I'll have more again but if anyone can answer these ones for now that would be great! Thank you!

Answer 1

Ok so basically you need to rearrange things so that the given variable is by itself.

for the first one:
s=n/2(a+1)
*2 to both sides
2s=n(a+1)
get rid of a+1

so, it should be 2s - (a+1) = n


for the second:

a=p(1+rt)
/p both sides
a/p = 1+rt
....hmm i'm not so sure about this one actually

but you get the point

for the third:
a = v - u/t

multiply each side by -t/u to cancel it out

a * -t/u = v



yay, # 1 and 3 should be correct... if i'm wrong, then i apologize... but i think i'm right for those two

Answer 2

These are equations. Each side equals the other, so, all you need to do is add, subtract, multiply, and divide things on both sides so that the variable you want is the only thing remaining on that side. I will only answer the first one because I want you to try it out yourself.

S = n/2(a+1)

You want to isolate n.

Multiply (a+1) on both sides to get rid of that on n's side.

S (a+1) = n(a+1)/2(a+1)
or S (a+1) = n/2 x (a+1)/(a+1)


Because a number divided by itself is 1, (a+1)/(a+1) =1, so that can be considered gone on n's side. (I hope you wrote the problems right)

S (a+1) = n/2

Then, simply multiply 2 to both sides also, so get rid of 2 on n's side.

2S(a+1) = n

There you have it. We now know what the formula is like in terms of n, rather than in terms of S.