Solve the problem.Total profit is defined as total revenue minus total cost. R(x) and C(x) are the total revenue and total cost respectively from the sale of x televisions. If 
and 
find the profit from the sale of 90 televisions.
A. $25,410
B. $15,690
C. $9690
D. $19,410
Answer: C
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Find the center of mass of a thin plate of constant density covering the given region.The region bounded by the x-axis and the semicircle y = 
A. 
= 
, 
= 
B. 
= 0, 
= 
C. 
= 0, 
= 
D. 
= 
, 
= 0
Find the area of the triangle using Heron's formula. Round your answer to two decimal places as needed.
A. 16.43 mm2 B. 5.81 mm2 C. 8.22 mm2 D. 11.62 mm2
Solve the problem.Maria and Charlie can deliver 75 papers in 3 hours. How long would it take them to deliver 60 papers?
A. 3.2 hr B. 3.8 hr C. 2.4 hr D. 180 hr
Solve the problem.If two resistors are connected in parallel, the total impedance is given by 
. Find the total impedance ZT when the impedances 
and 
are in parallel. 
?Parallel Circuit
A. 424
B. 
C. - 
- 
j
D. - 
+ 
j