<em>Without</em> using a truth table:
(<em>p</em> ⇒ <em>q</em>) ∨ <em>q</em> ⇔ (¬<em>p</em> ∨ <em>q</em>) ∨ <em>q</em> ⇔ ¬<em>p</em> ∨ <em>q</em> ⇔ <em>p</em> ⇒ <em>q</em>
<em />
<em>With</em> a table:
<em>p</em> … <em>q</em> … <em>p</em> ⇒ <em>q</em> … (<em>p</em> ⇒ <em>q</em>) ∨ <em>q</em>
T … T … T … T
T … F … F … F
F … T … T … T
F … F … T … T
$7 was paid to park the car for 3 hours.
3 hours cost $7 to park
1 hour = $ (7/3)
So every 1 hour cost $(7/3)
Therefore cost in dollars, c = (7/3)*p
Therefore c = (7/3)p, where c is the cost in dollars of parking and p is the number of hours.
Answer:
a day on Venus is about 400 times as long as a day on Neptune