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GarryVolchara [31]
3 years ago
7

If a semi-circle is rotated about the y-axis as shown below, what three-dimensional polyhedral would be formed? a Sphere b Cone

c Cylinder d Pyramid
Mathematics
2 answers:
KatRina [158]3 years ago
7 0

Answer:

a Sphere

Step-by-step explanation:

If a semicircle is rotated about the y-axis or the axis of its diameter, the three dimensional shape produced is a sphere. A sphere is a shape in three dimension that look like a ball and when drawn in two dimension it looks like a circle. The distance from any point on the sphere to its center is always the same. A sphere has only one surface without any edges or vertices, therefore it is perfectly symmetrical.

Svet_ta [14]3 years ago
5 0

Answer:

a

Step-by-step explanation:

there needs to have a graph or something to give an idea but i hope it helps you good luck.

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Iteru [2.4K]

Answer:

The correct answer is that all trapezoids are quadrilaterals. ... Trapezoids are four-sided polygons, so they are all quadrilaterals.

Step-by-step explanation:

hope it helped ( ◜‿◝ )♡

3 0
2 years ago
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If b&lt;0 and |b| = 4b+15 what is the value of b
Yanka [14]

Answer:

|b|= 4b+15

-b=4b+15

-b-4b= 15

-5b= 15

b= 15/-5

b= -3

the ans -3

3 0
3 years ago
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A projectile is launched into the air. The function h(t) = –16t2 + 32t + 128 gives the height, h, in feet, of the projectile t s
Zinaida [17]

Answer:

t = 4 seconds

Step-by-step explanation:

The height of the projectile after it is launched is given by the function :

h(t)=-16t^2+32t+128

t is time in seconds

We need to find after how many seconds will the projectile land back on the ground. When it land, h(t)=0

So,

-16t^2+32t+128=0

The above is a quadratic equation. It can be solved by the formula as follows :

t=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}

Here, a = -16, b = 32 and c = 128

t=\dfrac{-32\pm \sqrt{(32)^2-4\times (-16)(128)} }{2\times (-16)}\\\\t=\dfrac{-32+ \sqrt{(32)^2-4\times (-16)(128)} }{2\times (-16)}, \dfrac{-32\- \sqrt{(32)^2-4\times (-16)(128)} }{2\times (-16)}\\\\t=-2\ s\ \text{and}\ 4\ s

Neglecting negative value, the projectile will land after 4 seconds.

4 0
3 years ago
Question 25 of 25
frez [133]

Answer:

It is actually 2 and -6.

Step-by-step explanation:

i hope i helped <33

6 0
3 years ago
You are creating identical picnic basket using 30 sandwiches and 42 apples. What is the greatest number of basket that you can f
UNO [17]

Answer:

Step-by-step explanation:

30: 1, 2, 3, 5, 6, 10, 15, 30

42: 1, 2, 3, 6, 7, 14, 21, 42

greatest number of fill using all of the food is 6

6 0
3 years ago
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