Write the number in standard form.Light with a wavelength of 4 × 10-4 meters is in the infrared portion of the electromagnetic spectrum.
A. 0.0004
B. 0.00004
C. 0.004
D. 40,000
Answer: A
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If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.Find the acceleration vector.r(t) = (3 cos t)i + (7 sin t)j
A. a = (3 cos t)i + (7 sin t)j B. a = (-3 sin t)i + (-7 cos t)j C. a = (3 sin t)i + (7 cos t)j D. a = (-3 cos t)i + (-7 sin t)j
Solve.log3 1 = x
A. 9 B. 0 C. 3 D. 1
Evaluate the determinant.
A. 129 B. -1 C. -3 D. -5
Even with most of the problem missing, it is possible to tell whether a suggested answer is reasonable. Determine whether the answer given is reasonable. If it is unreasonable, move the decimal point or insert a decimal point to make the answer reasonable.How tall is the skyscraper?3 feet
A. Unreasonable, should be 30 feet B. Unreasonable, should be 300 feet C. Reasonable D. Unreasonable, should be 0.30 feet