Provide an appropriate response.Light with a wavelength of 4 × 10-4 meters is in the infrared portion of the electromagnetic spectrum. Write 4 × 10-4 in standard form.
A. 0.0004
B. 40,000
C. 0.004
D. 0.00004
Answer: A
Mathematics
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Evaluate the double integral over the given region.
R = {(x, y): 0 ? x ? 3, 0 ? y ? 8}
A. 9 ln 4
B. 
ln 4
C. ln 36
D. ln 4 ln 9
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Evaluate the expression by first changing the form. Verify the answer by use of a calculator. sin 190° cos 70° - cos 190° sin 70°
A. - 
B. - 
C. 
D. - 
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Use determinants to find the area of the triangle with vertices at the given points. ? P(8, 14), Q(12, 20), R(10, 3) ?
A. 
B. 
C. 
D. 
E. 
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Divide.
÷ (-45)
A. - 5
B. - 
C. -10
D. 
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