Hurry i need ! for a group experiment, your science class measured the fine- particulate concentrations in the air at random places around campus, and estimated a sample average of 12 (micrograms per cubic meter). if 196 readings were taken, and standard deviation of the sample measurements was 3.5 (micrograms per cubic meter), you are 99.7% confident that actual concentration of fine particulates at the school is

idk

step-by-step explanation:

your victory is right around the corner. never give up.

- niki minaj

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

this excerpt is taken from the book “we shall not be moved : the women’s factory strike of 1909 “ and is written by joan dash. it is the story of the great strike when almost 30thousand women working in factories in america formed a union to fight unsafe working conditions, long working hours and miserable wages.

question: which best states the author’s purpose for including this information in the text?

answer: to challenge the reader’s ideas about a historical event

you didn't give an question you just gave us a statement