ElectricPavlov

Here is a desmos graph:   (edited....had a typo in the last solution)

Look at your negative z-score table for .0500 (or closest to it) for 5 %

z = -1.65     and   - 1.64    are equally apart from .0500

I'll take the average of these two (you may have been instructed to just choose one)

-1.645   standard deviations from the mean of 41

-1.645 ( 9) + 41 = 26.195  is 5th percentile

Good work, jf !

12600 shirt   / (1200 shirt/6 hr    x  9hr/day) =   12600 / (1200/6   * 9) days =......

nope...misread Q

Using periodic table of elements

usually    72.916 gm of HCl    reacts and forms 75.528 gm of CaCl

we can set up a ratio

10/72.916  =  x / 75.528     x = CaCl formed = 10.358 gm

(81+93+76+78 + x) / 5  = 85     solve for 'x'

Another method   ( you can refer to Chris' diagram)

South components     600  + 250 cos 35 = 804.788 m

East component                    250 sin 35 =  143.394

RESULTANT distance (use pythagorean theorem)       sqrt (  807.788^2  +  143.394^2 ) = 817 .46 miles from origin

Total area =  pi r^2    =  100pi

2/(5 pi)   is a fraction of 2pi

2/(5pi) / 2pi  * pi * 10^2 = 6.366  units ^2

maybe that is  2/5 *  pi

then    2/5 *  pi  /  2pi  x pi x 100 =  62.83 units^2