how to. . (1 Viewer)

[rr.dun.dun]

does anyone know how to table y=-x+5?

what is -x?

-0x?.

 

[watatank]

does anyone know how to table y=-x+5?

what is -x?

-0x?.

-1(x) = -(x)

So for x = -2

y = -(-2)+5
= 2+5
=7

The table looks like this...

x | -2 | -1 | 0 | 1 | 2 |
y | 7 | 6 | 5 | 4 | 3 |

 

[rr.dun.dun]

thanks. lol im so dumb i get all the obvious things wrong. i had worked it out before though i just read this now lol.

and the question is also from 0 to 100 so it starts from x=o, y=5, and so on.

thanks. .

 

[revhead.meg]

How bout these questions im not sure how to answer them...

(1) What percentage change is equivalent to an increase of 16% followed by a decrease of 16%?
(2) The heights of a group of 9yr old children are normally distributed with a mean of 145cm and a standard deviation of 8cm. What is the z-score of a height of 135m? [z+x- ¯x]
s
Thanks for any help

 

[princesskt]

lolz i get obvious things wrong too hehe

 

[watatank]

How bout these questions im not sure how to answer them...

(1) What percentage change is equivalent to an increase of 16% followed by a decrease of 16%?

Thanks for any help

i) say number is x,

16% increase ----> 1x +0.16x = 1.16x
16% decrease ----> 1.16x -0.16(1.16x) = 1.16x -0.16(1.16x) = 1.16x(1-0.16) = 1.16x(0.84) = 0.9744x

 

[revhead.meg]

i) say number is x,

16% increase ----> 1x +0.16x = 1.16x
16% decrease ----> 1.16x -0.16(1.16x) = 1.16x -0.16(1.16x) = 1.16x(1-0.16) = 1.16x(0.84) = 0.9744x

thank you (=