All categories

3 years ago

I need helpppppppppp

Mathematics

1 answer:

ludmilkaskok [199]3 years ago

5 0

The answer is B your welcome

You might be interested in

Do anybody know geometry?

choli [55]

Answer:

D. 29

Step-by-step explanation:

180 - 151 = 29

6 0

3 years ago

Find, correct to four decimal places, the length of the curve of intersection of the cylinder 4x2 1 y2 − 4 and the plane x 1 y 1

charle [14.2K]

<u>Answer-</u> Length of the curve of intersection is 13.5191 sq.units

<u>Solution-</u>

As the equation of the cylinder is in rectangular for, so we have to convert it into parametric form with

x = cos t, y = 2 sin t (∵ 4x² + y² = 4 ⇒ 4cos²t + 4sin²t = 4, then it will satisfy the equation)

Then, substituting these values in the plane equation to get the z parameter,

cos t + 2sin t + z = 2

⇒ z = 2 - cos t - 2sin t

∴ $\frac{dx}{dt} = -\sin t$

$\frac{dy}{dt} = 2 \cos t$

$\frac{dz}{dt} = \sin t-2cos t$

As it is a full revolution around the original cylinder is from 0 to 2π, so we have to integrate from 0 to 2π

∴ Arc length

$= \int_{0}^{2\pi}\sqrt{(\frac{dx}{dt})^{2}+(\frac{dy}{dt})^{2}+(\frac{dz}{dt})^{2}$

$=\int_{0}^{2\pi}\sqrt{(-\sin t)^{2}+(2\cos t)^{2}+(\sin t-2\cos t)^{2}$

$=\int_{0}^{2\pi}\sqrt{(2\sin t)^{2}+(8\cos t)^{2}-(4\sin t\cos t)$

Now evaluating the integral using calculator,

$=\int_{0}^{2\pi}\sqrt{(2\sin t)^{2}+(8\cos t)^{2}-(4\sin t\cos t)$ $= 13.5191$

8 0

3 years ago

What is 2+x if x=2? thanks

11Alexandr11 [23.1K]

Reorder 2 and x.
x + 2

4 0

3 years ago

Read 2 more answers

HELP ME ON THIS QUESTION ASAP!!!!!

Naya [18.7K]

The answer is 2

Y2-Y1 / X2-X1

7 0

3 years ago

I spent 3/4 of my money and then I spent 1/5 of what was left.

olga nikolaevna [1]

3/4+1/5 would be 19/20

5 0

3 years ago