Problem 1
1a) Jon created a torus while Nadia created a cone. A torus is basically a donut shaped 3D object. You can think of it as a 3D inflatable pool ring (lifeguard pool ring), or one of the rings from the game of ring toss.
------------------------
1b) Each plane of symmetry that Nadia points out is a plane that runs through points B and C. In a similar manner, Jon has the same plane of symmetry. Both have infinitely many planes of symmetry of this nature.
For Jon, his torus or donut shaped object can be cut in half along the horizontal axis. Imagine cutting a bagel so you can apply cream cheese or butter or whatever item you like. Each half of the bagel would be congruent to one another. This is the "plus 1" Jon is talking about.
This horizontal cut cannot be applied to Nadia's cone. If she were to cut her cone anywhere along a horizontal plane then she'd have a frustum at the bottom and a smaller cone up top (instead of two congruent smaller cones)
note: to be fair, infinity+1 is the same as infinity. They both describe the idea of listing numbers forever. We can add any number to infinity to get infinity.
=========================================
Problem 2
2a) To reflect over the xz plane, we keep the x and z coordinates the same. Only the y coordinate flips from positive to negative (or vice versa). For instance, the point P(0,5,4) becomes P'(0,-5,4) after such a reflection.
The algebraic way to write the rule is
(x,y,z) ---> (x,-y,z)
------------------------
2b) After applying the reflection rule, you should get the following
P(0,5,4) ---> P ' (0,-5,4)
Y(-2,7,4) ---> Y ' (-2,-7,4)
R(0,7,4) ---> Y ' (0,-7,4)
A(0,7,6) ---> Y ' (0,-7,6)
Once again, only the y value is changing. The sign of the y value specifically.
------------------------
2c) It's not entirely clear what your teacher means by "back", "left" and "up". Why is that? Because there are at least 2 different ways to orient the xyz axis.
One such way is to have the z axis sticking up and have the xy axis as the "floor" so to speak. Another way is to have the z axis come out of the board and have the y axis sticking up (so the xy axis is flat against the wall).
Concepts of "left", "right", "up", "down", etc are all relative to your frame of reference. One person's "up" is another person's "down". Unfortunately I don't think there's enough info to solve here. It would have been much more ideal if your teacher said something like "3 units along the x axis" rather than "3 units back".
------------------------
2d) See part C above. There isn't enough info (at least, in my opinion anyway).
=========================================
Problem 3
3a) A cylinder forms. The rectangle RECT is basically a revolving door. When you spin the revolving door really fast, it leads to the illusion of a 3D cylindrical block. You can also picture a propeller fan to visualize the same basic idea. This cylinder has a height of TC = 3 units. The radius is EC = 5 units.
------------------------
3b)
From part A, r = radius = 5, h = height = 3
SA = 2*pi*r^2 + 2*pi*r*h
SA = 2*pi*5^2 + 2*pi*5*3
SA = 50*pi + 30*pi
SA = 80*pi <--- exact surface area
SA = 251.3274 <--- approx surface area
surface area is in square units
------------------------
3c)
Use the same dimensions (r = 5, h = 3) from part B
V = pi*r^2*h
V = pi*5^2*3
V = pi*25*3
V = pi*75
V = 75*pi <--- exact volume
V = 235.6194 <--- approx volume
volume is in cubic units
Answer:
Step-by-step explanation:
function
The number of small packs is 2 and the number of large packs is 7
Step-by-step explanation:
A school is organizing a cookout where hot dogs will be served. The hot dogs come in small packs and large packs
- Each small pack has 8 hot dogs
- Each large pack has 18 hot dogs
- The school bought 5 more large packs than small packs, which altogether had 142 hot dogs
We need to find the number of small packs purchased and the number of large packs purchased
Assume that the number of the small packs is x and the number of the large pack is y
∵ There are x small packs
∵ Each small pack has 8 hot dogs
∵ There are y large packs
∵ Each large pack has 18 hot dogs
∴ The total number of hot dogs in all packs = 8x + 18y
∵ All packs had 142 hot dogs
- Equate the total number of hot doges by 142
∴ 8x + 18y = 142 ⇒ (1)
∵ The school bought 5 more large packs than small packs
∴ y = x + 5 ⇒ (2)
Now we have system of equations to solve it
Substitute y in equation (1) by equation (2)
∴ 8x + 18(x + 5) = 142
- Simplify the left hand side
∴ 8x + 18x + 90 = 142
- Add like terms in the left hand side
∴ 26x + 90 = 142
- Subtract 90 from both sides
∴ 26x = 52
- Divide both sides by 26
∴ x = 2
- Substitute the value of x in equation (2) to find y
∵ y = 2 + 5
∴ y = 7
The number of small packs is 2 and the number of large packs is 7
Learn more:
You can learn more about the system of equations in brainly.com/question/2115716
LearnwithBrainly
Answer
196
Step-by-step explanation:
