Solve the quadratic equation.20n2 + 26n = 0
A. 0
B. - 
C. - 
, 26
D. - 
, 0
Answer: D
Mathematics
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Solve problems using a calculator.To determine the thickness of a sheet of metal, six batches of 8 sheets each are measured with a digital micrometer. The thickness of each of the six batches of 8 is 0.3932, 0.3929, 0.3922, 0.3925, 0.3930, and 0.3924 mm. Find the average thickness of a single sheet of metal. (Round to the nearest ten-thousandth of a millimeter, if necessary.)
A. 0.0490 mm B. 0.0491 mm C. 0.3929 mm D. 0.3927 mm
Mathematics
Find all values of ? in [0°, 360°) that satisfy the equation.sec ? = - 
A. {225°, 315°} B. {45°, 225°} C. {135°, 225°} D. {45°, 315°}
Mathematics
Write the improper fraction as a mixed or whole number.
A. 
B. 
C. 
D. 
Mathematics
Find the multiplicative inverse, or reciprocal.z + 5
A. 
B. 
C. 1
D. 
Mathematics