The duration of routine operations at Chicago General Hospital has approximately a normal distribution with an average of 130 minutes and a standard deviation of 12 minutes. What proportion of operations lasted between 90 and 135 minutes?
.
a. 0.85
b. 0.79
c. 0.80
d. 0.66

What expression is equivalent to 42x-56y

Evaluate the expression for the given value of the variable. | ? 4 b ? 8 | + ? ? ? 1 ? b 2 ? ? + 2 b 3 -4b-8+-1-b2+2b3 ; b = ? 2 b=-2

On friday, there were x students at the baseball game. on monday, there were half as many students at the game as there were on friday. on wednesday, there were 32 fewer students at the game as there were on friday. which expression could represent the total number of tickets sold for all 3 games?