For this case we have the following equation:

Where,
w: The weight of a spring in pounds
E: the energy stored by the spring in joules.
Substituting values we have:

Making the corresponding calculation:
Answer:
the approximate weight of the spring in pounds is:
Answer:
$26.91
Step-by-step explanation:
11.96 divided 4 = 2.99
2.99 x 9 = $26.91
The 12 oz
Step-by-step explanation:
The twelve ounce because if you buys two of them its 2.18 and youll have four more ounces for only 19 more cents than the 20oz
Answer:
C
Step-by-step explanation:
The rate of change here will be the difference in the number of tracks divided by the difference in the number of albums.
Let's pick two random rows (it doesn't matter which two because they will produce the same result): (2, 16) and (4, 32).
The rate of change is: 
The answer is thus C.
S=small pizzas
p=pasta dinners
s+p=1600
9s+13p=15600
multiply first equaiton by -9 and add to the second one
-9s-9p=-14400
<u>9s+13p=15600 +</u>
0s+4p=1200
4p=1200
divide by 4
p=300
sub back
s+p=1600
s+300=1600
minus 300 both sides
s=1300
1300 small pizzas
300 pasta dinners