Solve the application problem.A water tank can be filled in 6 minutes and emptied in 8 minutes. If the drain is accidentally left open when the tank is being filled, how long does it take to fill the tank?
A. 
min
B. 24 min
C. 
min
D. 3
min
Answer: B
Mathematics
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Use a double-angle identity to find the exact value of the expression.1 - 2 sin2 67.5°
A. - 
B. 
C. 
D. - 
Mathematics
Find the values of x and y.
?
?
__________
?
__________
What will be an ideal response?
Mathematics
Work the chain multiplication.0 × 5 × 2
A. 0 B. 20 C. 10 D. 7
Mathematics
Solve and check.
+ 
= 
A. x = 28 B. x = -28 C. x = 4 D. x = 3
Mathematics