Use Heron's formula to find the area of the triangle. Round to the nearest square unit.a = 7, b = 13, c = 7
A. 17
B. 9
C. 36
D. 34
Answer: A
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Complete the ordered pairs. Then graph the equation.2x - y = 2(0, ), ( , 0), (2, )
A. (0, -2), (1, 0), (2, 2)
B. (0, 2), (-1, 0), (2, 6)
C. (0, -2), (-4, 0), (2, -1)
D. (0, -2), (-1, 0), (2, -6)
Simplify the algebraic expression. [4x2 + (10x2 + 1)] - [-(-7x2 - (-4 - 5x2)) + 8x2]
A. 4x2 + 5 B. 24x2 - 3 C. -26x2 - 5 D. 8x2 - 3
Simplify.200
A. -1 B. 20 C. -20 D. 1
?An employee of a delivery company earns $25.00 per hour driving a delivery van in an area where gasoline costs $2.60 per gallon. When the van is driven at a constant speed s (in miles per hour, with 
), the van gets 
miles per gallon. Determine the most economical speed s for a 100-mile trip on an interstate
highway. ? A. ?The most economical speed is 52.0 mph. B. ?The most economical speed is 48.0 mph. C. ?The most economical speed is 25.0 mph. D. ?The most economical speed is 50.0 mph. E. ?The most economical speed is 53.0 mph.