If the Moon were twice the distance from Earth than it currently is, the amount of time it would take to go around Earth would be roughly (the current orbital period of the Moon is four weeks)
A. 8 weeks
B. 11 weeks
C. 6 weeks
D. 88 weeks

Explanation:

Third Kepler's law states that the ratio of the squares of the orbital periods of the planets and satellites to the cubes of their average distances from the  center of the orbit is constant.

In mathematical terms:

Substitute T₁ = 4week, R₁ = D, R₂ = 2D, and solve for T₂:

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it