Question

How can you solve this problem?
1. Beni's uncle is building a deck for her house that is proportional to the 12- feet by 20- feet deck he built for his house. The scale factor between his deck and her deck is one point five. Which of the following could be a measurement for Beni's deck?

6 feet

18 feet

20 feet

24 feet

Answer 1

The uncle's deck is 12 by 20

her deck will be 1.5 times bigger...ie each dimension is 1.5 times the dimensions that make up the uncle's deck

12*1.5 = 18
20*1.5 = 30

So her deck will be 18 by 30

Answer 2

I get it now. in the lesson it said something like that I just didn't get it. Thanks :)

Answer 3

yw

Answer 4

1. MATH HELP PLEASE!!!! Which of the following is true about this shape?

It does not have rotational symmetry
It has rotational symmetry of order 2.
it has rotational symmetry of order 4.
It has rotational symmetry of order 8.

Answer 5

can you rotate this so it lines up with the original image?

Answer 6

and keep in mind that the angle of rotation can't be 360 or more

Answer 7

this is the original image

Answer 8

i know

Answer 9

can you rotate the image at all so that it matches up with itself (but the angle of rotation is between 0 and 360)

Answer 10

how do I rotate it? on a piece of paper?

Answer 11

yeah either draw it out or try to imagine it

Answer 12

got it, but when you match it up how do you no if it is of any order?

Answer 13

well how many times does it match up?

Answer 14

you'll find it matches up with itself 2 times, so the order is 2

here is a page that explains the whole idea (with pictures and animations)

http://www.mathsisfun.com/geometry/symmetry-rotational.html

Answer 15

Ohhhh I get it since it has two arrows it is the order two.

Answer 16

yeah that's a quick and easy way to remember

Answer 17

thank you. Math is hard for me since I have no one to explain it to me.

Answer 18

you're welcome, glad to be of help