Resistivity (ρ) = R * (A / L) = 4 * (1 x 10^-6 / 2) = 4 x 10^-6 Ω·m.

The resting membrane potential of a typical neuron is approximately -70 mV.

(15 + 5) = 20, then 20 × 2 = 40.

(15 + 5) = 20, so 20 × 2 = 40.

15 ÷ 3 = 5, then 5 × 4 = 20.

(a - b)(a + b) = a² - b², which is the difference of squares.

(x + y)(x - y) = x² - y², which is the difference of squares.

When subtracting, the result should be rounded to the least number of decimal places. 5.00 has two decimal places and 2.1 has one, so the result should be rounded to one decimal place: 5.00 - 2.1 = 2.90 becomes 2.9.

6.022 rounded to 3 significant figures is 6.02.

6.022 rounded to three significant figures is 6.02 × 10^23.

The result should be rounded to one decimal place, giving 12.4.

When adding, the result should be rounded to the least number of decimal places. 12.11 has two decimal places and 0.3 has one, so the result should be rounded to one decimal place: 12.41 becomes 12.4.

Adding 1011 and 1101 in binary results in 11110.

Adding the polynomials gives (3x^2 + x^2) + (2x - x) + (1 + 4) = 4x^2 + x + 5.

Cytokinesis results in the physical separation of the cytoplasm, leading to the formation of two daughter cells.

Destructive interference occurs when two waves of equal amplitude meet out of phase, resulting in an amplitude of zero.

In division, the result should have the same number of significant figures as the measurement with the least significant figures. 100.0 has 4 significant figures and 4.00 has 3 significant figures, so the answer should be 25.0 with 3 significant figures.

150.0 has four significant figures and 3.00 has three significant figures. The result should be reported with three significant figures: 50.0.

In division, the result should have the same number of significant figures as the measurement with the least significant figures. 6.38 has 3 significant figures and 2.0 has 2 significant figures, so the answer should be rounded to 2 significant figures: 3.19 becomes 3.2.

In division, the result should have the same number of significant figures as the measurement with the least significant figures. 8.0 has 2 significant figures and 2.00 has 3 significant figures, so the answer should be 4.0 (2 significant figures).

When two waves of equal amplitude and opposite phase meet, they cancel each other out, resulting in destructive interference.

When two waves of equal amplitude and opposite phase combine, they cancel each other out, resulting in destructive interference.

When light passes through a polarizer and then an analyzer at 90 degrees, no light passes through due to the orthogonal orientation.

Mixing equal volumes of 0.1 M HCl and 0.1 M NaOH results in a neutral solution with pH = 7.

In multiplication, the result should have the same number of significant figures as the factor with the least significant figures. 6.02 x 10^23 has 3 significant figures and 3.0 has 2, so the answer should be 1.8 x 10^24.

In subtraction, the result should be rounded to the least number of decimal places. 10.0 has one decimal place and 5.00 has two, so the result should be rounded to one decimal place: 5.0.

In subtraction, the result should be rounded to the least number of decimal places. 10.0 has one decimal place and 5.678 has three, so the result should be rounded to one decimal place: 4.32 becomes 4.3.

The symmetric difference includes elements that are unique to each set, excluding those that are common.

Resultant = (2 + (-1), 3 + 4) = (1, 7).

Resultant = (1 - 1, 2 - 2) = (0, 0)