Question

Solve the equation or formula for the indicated variable.
S= 5r^2t, for t
A. t= S/5 - r
B. t= 25r/S
C. t=S/5r^2
D. t= r^2- 5S

Answer 1

@mathstudent55 ?

Answer 2

@johnweldon1993

Answer 3

@cormacpayne

Answer 4

\[S = 5r^{2t}\]

Answer 5

What do i do? /.\

Answer 6

That's the problem, right? It's not...
\[S = 5r^{2}t\] right?

Answer 7

Yeah :P

Answer 8

If the problem is ^ that, then it is \[t = \frac{ S }{ 5r^{2} }\]

Answer 9

But if it is the first one...

Answer 10

Its the second one :)

Answer 11

Thanks :)

Answer 12

Okay that makes sense, so it is just a matter of dividing in order to get t by itself on one side

Answer 13

Can you help me on another one really quick?

Answer 14

Sure, no problem.

Answer 15

2|7-7x|= 2x +4 can you solve it? or help me solve it ?

Answer 16

Sure, so first let's get the absolute value by itself:
\[\left| 7 - 7x \right| = x + 2\]

Answer 17

And now, when you want to get rid of the absolute value, you have to set up two equations:
\[7 - 7x = x + 2\]
\[7 - 7x = -(x + 2)\]

Answer 18

Because you want the right side to equal whatever the absolute value could be, which could be either positive or negative. Does that make sense?

Answer 19

Yeah? lol so i just solve that ^^

Answer 20

Yup! Solve both equations for x and you have your answer.

Answer 21

5/-8? :)

Answer 22

Almost!

Answer 23

Watch out for your sign changes.

Answer 24

5/8???

Answer 25

That's one of the solutions! Now you just have to solve the other equation and you're done!

Answer 26

5/6?

Answer 27

3/2?

Answer 28

Great! Those are your answers!

Answer 29

Wait so 5/8 and 3/2?

Answer 30

Yup!

Answer 31

okay thanks :) If i need help on another can i message you?

Answer 32

Sure thing!

Answer 33

okay :)