Three vegetables were bought at the grocery store: tomatoes ($2.29 per pound), celery ($1.29 per pound), and broccoli ($1.69 per pound). Twice as many pounds of tomatoes were bought as compared to celery. If a total of 42 pounds of vegetables were purchased at a price of $80.58, how many pounds of broccoli were bought?
??
A. 8 pounds
B. 6 pounds
C. 9 pounds
D. 7 pounds
E. 5 pounds
Answer: B
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Solve the problem.The Van der Waals equation provides an approximate model for the behavior of real gases. The equation is P(V, T) = 
- 
, where P is pressure, V is volume, T is Kelvin temperature, and a,b , and R are constants. Find the partial derivative of the function with respect to each variable.
A. PV = - 
+ 
; PT = 
B. PV = 
; PT = 
- 
C. PV = 
- 
; PT = 
D. PV = 
- 
; PT = 
Solve for the indicated variable.Solve r = 
for ?.
A. ? = 2Ar2
B. ? = 
C. ? = 
D. ? = 
Solve.4x - 2 = 124 - 10x
A. - 
B. 9
C. -9
D. - 21
Provide an appropriate response.Complete the following: The set of all points that are 4 units from the point whose coordinates are 
is a 
with 
and 
.
A. circle; center at (8, -1); radius 4 B. parabola; vertex at (8, -1); opens up C. circle; center at (8, -1); radius 16 D. circle; center at (0, 0); radius 4