What variables show a direct relationship? check all that apply.

1. the speed of a car and the distance traveled

2. the elevation above sea level and the air temperature

3. the number of students in a cafeteria and the amount of food consumed

4. the mass of an icicle and the time it takes to melt

5. the distance a planet is from the sun and that planet’s temperature

6. the mass of a space shuttle and its acceleration through space

Option 1,2,4 & 5 have direct relationship

Explanation:

By direct relationship , it is meant that if one quantity increases the other one should also increase and when a quantity decreases the other quantity must also decrease.

In other worlds there must a directly proportional relationship between two quantities.

Hence, except option 2 where the relationship between the number of students and the amount of food consumed is inversely proportional all other options are directly proportional.

Thus, 1,2,4 & 5  are correct

a. possible errors

d. new questions

explanation:

predictions and planning happen before. a summery comes after. errors you get after investigation and new questions propose what you can look for in the future.

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.