Answer:
<u>A</u> He should ask his students to know what they prefer
Step-by-step explanation:
It’s a grouping of linear(straight line)equations that deal with the same variables. Hope that helped?
Step 1. Simplify

to

Step 2. Simplify

to

Step 3. Simplify

to

Step 4. Cancel

on both sides
Step 5. Multiply both sides by

(the LCM of

)
Step 6. Expand
Step 7. Subtract

from both sides
Step 8. Simplify

to

Step 9. Multiply both sides by


Done! :) Hope this helps! :)
Height would be 21 inches, depth would be 5.