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Julli [10]
3 years ago
9

The region bounded by the given curves is rotated about the specified axis. find the volume v of the resulting solid by any meth

od. y = −x^2 + 10x − 21, y = 0; about the x-axis

Mathematics
1 answer:
makkiz [27]3 years ago
6 0
Consider, pls, the suggested option (see the attachment).

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Please solve the question and give correct answer with explanation so that i can understand it​
denis-greek [22]

Answer:

  • Yes

Step-by-step explanation:

Let the speed of the car is c and speed of the plane is p.

<h3>We are given:</h3>

The speed of the plane is 7 times the speed of the car

  • p = 7c

The distance traveled is

  • d = 315 km

The time difference to travel this same distance is 3 hours.

<h3>We know that:</h3>
  • d = ts, where d- distance, t- time, s - speed

Find the time for car and plane and their difference.

<h3>Car</h3>
  • t = d/s = 315/c
<h3 /><h3>Plane</h3>
  • t = d/s = 315/p = 315/(7c) = 35/c
<h3 /><h3>The difference</h3>
  • 315/c - 45/c = 3

<u>Solve it for c:</u>

  • (315 - 45)/c = 3
  • 270/c = 3
  • c = 270/3
  • c = 90 km/h

Now find the speed of plane:

  • p = 7c = 7*90 = 630 km/h

As we see, Jenny is right

6 0
2 years ago
Jasmine needs to reduce the height of a picture from five inches to two inches so it will fit in the yearbook. What percentage o
sasho [114]
  • <em>The picture's height was reduced by </em><em><u>60% to 40%</u></em>
5 0
3 years ago
I need help on this quick
Pachacha [2.7K]

Answer:

The hypotenuse to the nearest tenth is 8.1

Step-by-step explanation:

We can use the Pythagorean theorem to solve

a^2 + b^2 = c^2 where a and b are the legs and c is the hypotenuse

Let a be the x leg and b be the y leg

a = 7 units

b= 4 units

7^2 + 4^2 = c^2

49+ 16 = c^2

65 = c^2

Take the square root of each side

sqrt(65) = sqrt(c^2)

8.062257748 =c

To the nearest tenth

8.1 =c

7 0
3 years ago
-3(4x+5)<br><br> a- 7x+15<br> b- 7x-15<br> c- -12x-15<br> d- -12x+15
Alexandra [31]
C, because everything inside the parenthesis is multiplied by -3.
3 0
3 years ago
-7(7x+8)≤287 please help its urgent
weqwewe [10]
X is great her than or equal to 7
8 0
3 years ago
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