The argument has a true conclusion. Identify the argument as valid or invalid.
is less than 12.6 is less than 12. 
A. Invalid
B. Valid
Answer: A
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?Express the slope of the line containing the points (0, 0), (8, 500) if x represents the time (in hours) and y represents the number of miles driven. ?
A. ?250 miles driven in 4 hours. B. ?62.5 miles driven per hour. C. ?Both a and b D. ?125 miles driven per 1/2 hour. E. ?None of the above.
Which of the following is not an example of a dilation? ?
A.
?
B.
?A A
C.
?
D.
?a and c only.
E.
?a and b only.
A balloon is leaking air, and the rate of change in volume is proportional to the volume. Let V denote the volume, in liters, of air in the balloon after t seconds, and take -0.03 to be the constant of proportionality.
?
A: Write an equation of change satisfied by 
.
?
B: If there are initially 8 liters of air in the balloon, find a formula that gives V as a function of t. Write your answer using the alternative form for an exponential function.
?
C: How long will it take for 10% of the initial volume of air to leak from the balloon? Round your answer to two decimal places.
What will be an ideal response?
Solve.
+ 
= 4
A. -3
B. 3, 
C. 3
D. No solution