1 point The Sun is a massive star at the center of our Solar System. The planets
closest to the Sun are terrestrial planets, and those farther away are gas
giants. Which force maintains this arrangement of the Solar System? *
Electromagnetism
Friction
Gravity
Torsion

Gravity

Explanation:

It is gravity because the sun's gravity pulls all the planets towards itself and keeps the planets in the sun's orbit

$119

Explanation:

For computing the marginal social benefit of the first plant the relevant information is provided as per the question below:-

Robin first plant benefit per day = $47

Greg first plant benefit per day = $41

Ray first plant benefit per day = $31

The computation of marginal social benefit of the first plant is shown below:-

Marginal social benefit of the first plant = Robin first plant benefit per day + Greg first plant benefit per day + Ray first plant benefit per day

= $47 + $41 + $31

= $119

Therefore for computing the marginal social benefit of the first plant we simply added all the three employees first plant benefit per day.