Calculate the area of the surface S.S is the lower portion of the sphere x2 + y2 + z2 = 25 cut by the cone z = 
.
A. 10
?
B. 25
?
C. 25
D. 50
?
Answer: D
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Solve the problem.Julio buys a bike which has a cash price of $280. He puts $30 down, and agrees to pay 12 payments of $24. After 8 payments he gets some birthday money and decides to pay off his loan. Find the unearned interest and the amount to pay off the loan.
A. $4.87, $91.13 B. $7.28, $88.72 C. $3.34, $92.66 D. $5.14, $90.86
Solve the problem.The product of 8 and the square root of some number is equal to that number decreased by 128. Find the number.
A. 128 B. 256 C. 192 D. 512
Solve the problem.For four airplane trips you experienced the following delays: 32 minutes, 
What was the average delay?
A. 121 min B. 120 min C. 29 min D. 30 min
Perform the matrix operation.Let A = 
and B = 
. Find A - B.
A. 
B. 
C. 
D. 