Evaluate the expression for the given values. Expression your answer as a fraction unless otherwise indicated.0.7x2 + 0.398y2 x = 4, y = 2 Round to the nearest tenth.
A. 12.8
B. 9.2
C. 8.5
D. 45.9
Answer: A
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Factor by grouping.20x4 + 15x2 - 8x2 - 6
A. (5x2 + 2)(4x2 - 3) B. (5x2 - 2)(4x2 + 3) C. (5x4 - 2)(4x + 3) D. (20x2 + 2)(x2 - 3)
Solve the problem.Suppose that sales of a particular brand of appliance satisfy the relationship 
where y represents the number of sales in year x, with 
corresponding to 1992. What does the ordered pair 
mean in the context of the situation? 
A. In 2000, sales of the appliance were 2580. B. In 2000, sales of the appliance were 2370. C. In 2000, sales of the appliance were 4950. D. In 2000, sales of the appliance were 5160.
Solve the problem.The roof of a building is in the shape of the hyperbola 
where x and y are in meters. Refer to the figure and determine the height, h, of the outside walls.A = 3 m
A. 7.5 m B. 11.2 m C. 56 m D. 3.3 m
Perform the indicated operation. Write your result in scientific notation.(3.8 × 10-7)(1.8 × 10-9)
A. 6.84 × 10-16 B. 5.6 × 1016 C. 6.84 × 1016 D. 6.84 × 10-2