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

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

yes

step-by-step explanation:

yes