How do you do this question?

Solution: V = 17π/9

Step-by-step explanation:

If we use the washer method here, we can determine the volume on the region R₃ about AB by integrating along the y-axis. It would be corresponding to the following formula:

Keep in mind that we want to determine particular values with which we can substitute into our formula here, and calculate the volume. Let's list our key points...

◘ Our limits here would be 0 ≤ y ≤ 5. Therefore we would integrate on the interval [ 0 to 5 ].

◘ Remember that r = 1 − x₁, and R = 1 - x₂. If we isolate the equations of the green and blue lines for the 'x - term,' we will receive r = 1 - 1/5y, and R = 1 − (1/5y)⁴.

We now have all the information we need. Let's substitute into our volume formula and solve for V respectively. Let's start by solving for 'π(R^2 - r^2)' and then substitute back to solve for V in our formula:

As you can see your solution is 17π/9.

V = 17π/9

Step-by-step explanation:

Region 3 is the area between the curves y₂ = 5∜x and y₁ = 5x.

Line AB is the line x = 1.

When we revolve region 3 around the line AB, we get a cone-shaped solid.  Since the solid is hollow, we can use either washer method or shell method.

Let's try washer method.  Slice the shape horizontally so that the cross sections are washers (disks with holes in them).  The thickness of each washer is dy.  The outside radius of each washer is:

R = 1 − x₂

R = 1 − (⅕ y)⁴

The inside radius of each washer is:

r = 1 − x₁

r = 1 − ⅕ y

So the volume of each washer is:

dV = π (R² − r²) t

dV = π ((1 − (⅕ y)⁴)² − (1 − ⅕ y)²) dy

dV = π (1 − 2 (⅕ y)⁴ + (⅕ y)⁸ − (1 − 2 (⅕ y) + (⅕ y)²)) dy

dV = π (1 − 2 (⅕ y)⁴ + (⅕ y)⁸ − 1 + 2 (⅕ y) − (⅕ y)²) dy

dV = π (-2 (⅕ y)⁴ + (⅕ y)⁸ + 2 (⅕ y) − (⅕ y)²) dy

The total volume is the sum of all the washers from y=0 to y=5.

V = ∫ dV

V = ∫₀⁵ π (-2 (⅕ y)⁴ + (⅕ y)⁸ + 2 (⅕ y) − (⅕ y)²) dy

If u = ⅕ y, then du = ⅕ dy, and 5 du = dy.

When y = 0, u = 0.  when y = 5, u = 1.

V = ∫₀¹ π (-2u⁴ + u⁸ + 2u − u²) (5 du)

V = 5π ∫₀¹ (-2u⁴ + u⁸ + 2u − u²) du

V = 5π (-⅖ u⁵ + ¹/₉ u⁹ + u² − ⅓ u³) |₀¹

V = 5π (-⅖ + ¹/₉ + 1 − ⅓)

V = 17π/9

answer: 48

just remember to use pemdas:

parentheses

expressions

multiplication

division

addition

subtraction

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.