Combine like terms whenever possible. Write the result with descending powers.-0.8y -0 .4y2
A. -0.8y -0 .4y2
B. -8y2 + 4y
C. -4y3
D. -0.4y2 -0 .8y
Answer: D
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Complete.19
gal = qt
A. 156 B. 78 C. 76 D. 38
Solve the system of equations by determinants. 3x + z = -7 w + x + 3y - z = 243w + y + 3z = 11 w + x + 4y = 25
A. w = 18, x = -3, y = 20, z = -12 B. w = 6, x = -1, y = 20, z = -4 C. w = 6, x = -1, y= 5, z = -4 D. w = 6, x = -3, y = 10, z = -8
Solve the problem.A lot is in the shape of a right triangle. The shorter leg measures 60 meters. The hypotenuse is 20 meters longer than the length of the longer leg. How long is the longer leg?
A. 60 m B. 80 m C. 120 m D. 100 m
Solve the problem.A rock group is producing a new CD. The cost in dollars to produce a CD is given by 
where x is the number of man hours of work required and y is the number of hours of studio time required. Find the value of x and the value of y that minimize the cost.
A. 92 man hours of work; 15 hours of studio time B. 90 man hours of work; 18 hours of studio time C. 89 man hours of work; 14 hours of studio time D. 95 man hours of work; 20 hours of studio time