Solve the following quadratic equation using the quadratic formula. Find the exact answer. If there are no real solutions, so state.x2 + 4x - 21 = 0
A. x = 7 or x = -3
B. x = -7 or x = 3
C. x = -7 or x = 1
D. x = 7 or x = 3
Answer: B
Mathematics
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Use the range rule of thumb to approximate the standard deviation.The race speeds for the top eight cars in a 200-mile race are listed below. Round results to the nearest tenth.188.5 188.6 189.2 187.2 175.6 178.5 176.8 185.4
A. 3.4 B. 1.1 C. 6.8 D. 7.5
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Factor:
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Solve.It is recommended that there be at least 19 square feet of work space for every person in a conference room. A certain conference room is 10' by 11'. Find the maximum number of people the room can accommodate.
A. 16 people B. 26 people C. 6 people D. 5 people
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Find the difference quotient, 
, for the function and simplify it.a(x) = 
A. 
B. 
C. 
D. 
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