Wave erosion causes a certain coastline to recede at a rate of 3 centimeters each year. This occurs uninterrupted for a period of 8 years. How far will the coastline recede in 8 years?

24 cm

Step-by-step explanation:

Given that:

Rate at which coastline recedes per year = 3cm

Recede rate occurred uninterrupted for 8 years ; how far will the coastline recede in 8 years :

3cm per year for 8 years

Hence,

3cm * 8

= 24 cm

The coastline would have recede for 24cm in 8 years

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.