3 years ago

Plss help for brainlist

Mathematics

1 answer:

saveliy_v [14]3 years ago

7 0

Answer:

option A is correct...hope this answer helps you dear...take care!

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Anyone know? Help is much appreciated

12345 [234]

Answer

Step-by-step explanation:

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3 years ago

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

Calculate the number of ways to form a set of three distinct items such that no two of the selected items are in the same row or

Eddi Din [679]

Answer:

1200

Explanation:

Order does not matter, if we said xyz order, it would still not make a difference if it was zyx or yzx hence we use the combination formula:

nCr = n! / r! * (n - r)!

where n= total number of items

r= number of items chosen at a time

Combinations are used when the order of events do not matter in calculating the outcome.

We calculate using the formula:

(30×20×12)÷3!=1200

There are therefore 1200 ways for the three distinct items to not be in same row or column

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3 years ago

LaToya has $113.94 in her checking account. During the week she goes to an ATM and withdraws $40. She is charged a usage fee of

Scilla [17]

113.94-42.50+189.73-22.50-70.18= $168.49

LaToya has $168.49 in her checking account

8 0

3 years ago

Read 2 more answers

131.12 divided by 44

Arte-miy333 [17]

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6 0

3 years ago