The answer is: t = 1
You need to separate t from everything to figure out what it is.
Step 1: Subtract 9 from both sides, so we get 7 - 2t = 5t
Step 2: Add 2t to both sides, so we get 7 = 7t.
Step 3: Divide by 7, meaning t = 1.
Next you should check your work. If we plug 1 in for t, we get 14 = 14, so the answer is correct.
Hope this helps!
<span> A ⊂ B means all of A is in B
but then it says </span><span>A ∩ B = θ meaning they have nothing in common, ie, none of A is in B or vice versa
A must be the empty set for both these conditions to hold. B could be anything you want. B could be empty, or it could not be. It's impossible to tell.
For certain, A must be empty. Which is why the answer is choice C</span>
You would solve using the algebraic steps.
1. Get everything simplified
2. Get all variables on one side
3. Get all constants on one side
4. Get the variable by itself (no coefficient)
5. Simplify your answer.