Marc was told his dinner would be ready at 18: 00. he left his house at 12: 00 and traveled in his car at an average speed of 45 mph to his moms house 300 miles away. did marc make it in time for dinner

The answer to your question is: Marc won't be on time for dinner.

Explanation:

Data

dinner = 18:00

left = 12:00

speed = 45 mph

distance = 300 miles

time = ?

Formula

speed = distance / time

time =  distance / speed

time = 300 / 45

time = 6.7 hours

Then

from 12:00 to 18:00 there are 6 hours

Marc won't be on time.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72