I would pick the third choice because in order to find x, you must multipy your 4.
<h3>Given</h3>
- C(t) = 40 cm + t·(2/5 cm/s) . . . circumference of a circle vs time
<h3>Find</h3>
- dr/dt for radius r
- r at t=4 seconds
<h3>Solution</h3>
The circumference and radius of a circle are related by
... C = 2πr
so the radius in terms of circumference is
... r = C/(2π)
... r(t) = (40 +0.4t)/(2π) = (1/π)(20 cm + 0.2t cm/s)
Then dr/dt is
... dr/dt = 0.2/π cm/s
And the radius at t=4 s is
... r(4) = (1/π)(20 + 0.2·4) cm
... r(4) = 20.8/π cm
Answer:
If you multiply 40$x9 you get 360$. Then you do 120$x2 you get 240$. All together you have 600$ from 2 movies and 9 commercials. That is the 11 commercials and movies they were talking about and there's your answer.
To figure out how many cards are in each deck, divide 312 by 6. That comes out to a quotient of 52. That means there are 52 cards in each deck.
#5, the way to figure out which is the better deal, is to multiply the 2 package by the 5 package (note, DO NOT multiply the prices, only how many games they hold) that comes out to 10. So, what you do know is multiply the 2 games price by 5.
$11.98 * 5 = $59.9
Do the same with the 5 package, except multiply it by 2.
$24.95 * 2 = $49.9
Now, with these 2 answers you can tell that the 5 game package is $10 cheaper than the 2 game package, even though you are getting the same amount of games.
Hope this helps a little!
X= 3
Cancel 3 out by subtracting it by itself, then subtract 3 from 18 to get 15. Now that you have 5x= 15, just divide 15 by 5x to get x= 3
