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Answers by Tim E.

mean = 82 1 std dev = 5 2 std dev = 10   for a normal distribution  +/- 1 std dev = 68.2 %   or 34.1% to each side of the mean +/- 2 std dev = 95.4 %   or 47.7% to each side of the mean   I hope this graphically shows the...

Find the time (answer)

THE PHYSICS EQN IS JUST  X = ACC*T2/2  + V*T + X0   FOR BOTH CARS, THEY HAVE NO INITIAL SPEED V1  OR DISPLACEMENT X0   SO X = ACC*T2/2    CAR A HAS ACC = 5.5  BUT LEAVES 1.5 SEC AFTER CAR B CAR B HAS ACC = 4.4   XB...

the number of each coin times their value is the total amount, so   P = number of pennies N = number of nickels D = number of dimes   so we can write our total cents equation:   P(1) + N(5) + D(10) = 64      ! numbers...

the question doesn't say how many dolls.  there would be an infinite number.  But we'll just form the equation for the nth doll.      Largest doll =  12 inches 2nd doll      =  (12) x 0.7 3rd doll      =  (12...

4/(X+5) < 1/(2X+3)   FIRST MULTIPLY BOTH SIDES BY (X+5), AND THEN (2X+3) THIS IS THE EQUIVALENT OF CROSS MULTIPLYING       4(2X+3) < X+5       OR    8X + 12  <  X + 5   NOW...

True or False? (answer)

2Y = 5X + 4   IN SLOPE INTERCEPT FORM, SOLVE THE EQUATION FOR Y WHERE  Y = MX + B    SLOPE = M, AND B = Y INTERCEPT   Y = (5/2)X  + 4/2      OR    Y = (5/2)X + 2   THEREFORE, THE SLOPE = 5/2  ...

  2/3 lbs  divided among 12 people   so,  (2/3) / 12       this can be written as  2/3 * 1/12  = 2/36   factor num and denom by 2     each person would get  1/18 lb

  Set up as an inequality so the pay is at least as much as $90,000   43,800 + 2950*T  >=  90,000         Now just solve for T.  first subt 43,800 from each side   2,950*T  >=  90,000 - 43,800  ...

7B - 12 < 3B   With any equation, isolate the variable (in this case B) on one side, and the constant on the other remember, always add, subtract, divide, multiple the same to both sides !!   1)  subtract 3B from each side   7B - 3B - 12 < 0...