3 years ago

Х+ 2y = -1 2x – Зу = 12

Mathematics

1 answer:

yarga [219]3 years ago

4 0

Use substitution method

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Select the correct answer.

Scilla [17]

Answer:

B. I think

Step-by-step explanation:

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2 years ago

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The arc of the parabola y = x^2 from (3,9) to (4,16) is rotated about the y-axis. Find the area of the resulting surface. Please

Hitman42 [59]

Answer:

156.5

Step-by-step explanation:

Thinking process:

The area can be calculated using the formula:

$S = \int\limits^4_3 {2\pi x\sqrt{1+}(2x)^{2} } \, dx$

We let the substitution take place.

Therefore, we let $u = 1 + 4x^{2}$

Thus, $du = 8dx.$

So,

$xdx = \frac{1}{8}du$

Also, the interval of the integration changes to [ 37, 65]

Thus,

$S = \int\limits^4_3 {2\pi \sqrt{1+4x^{2} } } \, dx \\= \int\limits^65_35 {2\pi \sqrt{\frac{1}{8}u } } \, dx$

= $\frac{1}{6} [ 65^{\frac{3}{2}-37^{\frac{3}{2} } }$

= 156.5 units²

8 0

3 years ago

109⁰+118⁰+44⁰=× can you please help

Paha777 [63]

Answer:

x = 271 degrees

Step-by-step explanation:

6 0

2 years ago

El -2,4 es un número entero✨<br>Gracias!!! ✨✨✨

Marizza181 [45]

Answer:2

Step-by-step explanation:

subtract

3 0

2 years ago

Paul answer 2 out of 5 questions correctly Jan answered 43% of her questions correctly and Juan answered 13 correctly and 6 inco

nika2105 [10]

2/5 = 40%
43%
13/19 = 68.4%

Juan

7 0

3 years ago