ElectricPavlov

The denominator cannot = 0   This would be 'non-permissable'

16-16a^2   cannot = 0

   Let's find where that is:

       16-16a^2 = 0

         16 = 16a^2

            1= a^2

                a = 1 or -1    <-------Non-permissable points

The squre root has to be a 4 or 6  for the square to end in 6

4         16

6             36

14          196

16        256

24     576

 26       676

34            1156

36           1296

44        1936

46        2116                             So I'd say    1  3  9   5  or   7    for the tens' digit.....

Third one:   using negative z-score table

 -.25   S.D.  below the mean represent approx 40%

-.25 x 4.3 =1.075   gm    below the mean       Mean = 120     120 -1.075 = 118.925 gm

Wait a minute...... think this is pre calculus!   HaHa.....

Anyway.....

First one:   29 years is 2 standars deviations fro mean     and 37 is 2 standard deviations ABOVE mean......

  Using _ and + z-score table          2 standard devs below is .0228     2 standard deviations above from the + z-score table is .9772

                                                                        2.28%                                                   97.72%         The area between these two is the amount we are looking to.....               97.72 - 2.28 = 95.44%          95.44% x 400=381.76 ~~ 382 members

16^3 x 4     16^2 x 10  + 16^1 x 7   +   16^0 x ?  = multiple of 17

?= units digit = 1

Third one:  Look at your POSITIVE z-score table     25 ounces is   1oz/1.3oz/S.D =  0.7692 ~~.77 Standard deviations ABOVE the mean. This corresponds to

  .7794  z-score       SO  77.94 percent are LESS than this      77.94% x 1200 boxes =  935.28  ~~  935 boxes are 25 oz or less

Zscore -0.5   standard deviations from mean is   -0.5 (1.8) + 12.5 = 11.25 ft

Look at your NEGATIVE z-score table to find .20    (1 - 80% = .20)       and find approximately  -.84 standard deviations below the mean = .2005  (which means 1-.2005 are ABOVE this).....        

55 gm - .84 x 4.2   = 51.47 gm    80% are greater than this

https://web2.0calc.com/questions/need-help-p

Whoa there , pardner.....evaporating ether is ENDOTHERMIC.....it must absorb heat from surrounding to go from liquid to a gas....    Being flammable has nothing to do with it....if it is BURNING...THAT would be exothermic.

A. Put ZERO in for t and calculate

B  exponential growth

C We are currently 19 years past 2000....put 19 in for t and calculate....answer will be in MILLIONS....so multiply by 1000000 to get population count. (Same process for A part)