The drag force f on a boat varies jointly with the wet surface area a of the boat and the square of the speed s of the boat. a boat with a wet surface area of 50ft2 traveling at 7mph experiences a drag force of 98n . find the wet surface area of a boat traveling 7.5mph and experiencing a drag force of 135n .

Variation can be direct, inverse or joint.

The wet surface area is 60 square feet

The variation is given as:

Express as an equation

Make k the subject.

Rewrite as:

Where:

So, we have:

Make A2 the subject

Hence, the wet surface area is 60 square feet

Read more about variation at:

link

a

step-by-step explanation:

unless you made a typo, the answers are both a and c.

step-by-step explanation:

1.5/3 is .5 whereas 3/9 is .3333333 not proportional

22/33 is .66666 and 4/6 is also .66666 proportional

2/4 is .5 whereas 142/213 is .66666 not proportional

14/7 is 2 and 7/3.5 is also 2 proportional

you could've also checked it by doing this simple division:

if the larger fraction divides with the smaller fraction to equal 1, it is proportional. so let me show you what i mean:

when i divide 22/33 by 4/6 i get 1, so we know it is proportional, and it is the same with 14/7 and 7/3.5. now if i divide 3/9 by 1.5/3 i get .66666 so therefore we know it is not proportional.

there are many ways to do this so i wanted to show you some possible ways.