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 μg/m³ (micrograms per cubic meter). If 196 readings were taken, and the standard deviation of the sample measurements was 3.5 μg/m³, you are 99.7% confident that actual concentration of fine particulates at school is A.) 1.5 μg/m³- 22.5 μg/m³
B.) 5 μg/m³- 19 μg/m³
C.) 11.5 μg/m³- 12.5 μg/m³
D.) 11.25 μg/m³ - 12.75 μg/m³

62.5 paisa

step-by-step explanation:

4000*70 = 280000

280000-(2000*90) = 100000

4000-2400 = 1600

100000/1600 = 62.5

( give brainliest)

true

step-by-step explanation:

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c

answer: 1inch=7days  

12inch=12*7=84days

step-by-step explanation: