Simplify.-8x(9x + 6)
A. -120x2
B. -72x2 - 48x
C. 9x2 - 48x
D. -72x2 + 6x
Answer: B
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Find the second derivative of the function.s = 
A. 
= 5t3 - 
- 
B. 
= 5t4 - 
- 
C. 
= 20t5 + 
+ 
D. 
= 20t3 + 
+ 
Arrange the numbers from smallest to largest.4.9, 4
, -6, 4.8
A. -6, 4
, 4.8, 4.9
B. 4.8, 4.9, -6, 4
C. 4.9, 4.8, 4
, -6
D. -6, 4
, 4.9, 4.8
Verify the identity.
= 
What will be an ideal response?
Solve the problem using two linear equations in two variables and Cramer's rule.Two different gasohol mixtures are available. One contains 5% alcohol and the other 12% alcohol. How much of each should be mixed to obtain 500 gal of gasohol containing 10% alcohol? (Round to the nearest whole gallon.)
A. 208 gal 5%, 292 gal 12% B. 25 gal 5%, 60 gal 12% C. 357 gal 5%, 357 gal 12% D. 143 gal 5%, 357 gal 12%