Multiply and simplify. Assume that all variables represent positive real numbers.(
+ 
)(
- 
)
A. 10 - 2
B. 10 - z
C. 10z
D. 10 - 2
Answer: B
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Solve the equation 
for y. Round your answers to two decimal places, if necessary.
?
A. 
or 
B. 
or 
C. 
or 
D. None of the above.
Solve the problem.An object will take t seconds to drop d ft, where t = 
. Rewrite the formula by solving the equation for d.
A. d = 
B. d = 
C. d = 4t2
D. d = 16t2
Solve.The intensity of a certain noise is 7.66 × 10-10 W/cm2. How loud, in decibels, is this sound level? Use the formula D = 10 log (I/I0), where I0 = 10-16 W/cm2. (Round to the nearest decibel.)
A. 80 decibels B. -3 decibels C. 95 decibels D. 69 decibels
Solve the problem.
Southwest Dry Cleaners believes that it will need new equipment in 6 years. The equipment will cost $26,000. What lump sum should be invested today at 2% compounded semiannually, to yield $26,000?
A. $24,548.93 B. $24,487.64 C. $25,169.60 D. $23,073.70