chemistry
determine the number of representative particles in each of the following and identify the representative particle: 11.5 mol Ag; 18.0 mol H20; 0.150 mol NaCL.
Algebra
simplify k+5 _____ 30k _______ 5k-1 _____ 6k
math
At the beginning of a basketball game, the referee tosses the ball vertically into the air. Its height, h, in feet after t seconds is given by h(t) = -16t2 + 24t +5. During what time interval (to the nearest tenth of a second) is the height of the ball greater than 9 feet?
Math
512
statistics
The mean of nonresidential buildings is 30 years and the standard deviation of the ages of the buildings is 5 years. Determine the probability that a random sample of a group of 50 nonresidential buildings will have a mean age of less than 27.5 years.
Physics
I think we are in the same class, 'cause I'm working on this problem also...
Algebra
The recommended daily intake (RDI) of a nutritional supplement for a certain age group is 600 mg/day. Actually, supplement needs vary from person to person. Write an absolute values inequality to express the RDI plus or minus 50 mg and solve it.
Algebra
1/5x - 3 = 1/2x - 1/5x What's the ?
Algebra
Solve |4y – 3| > 8
Algebra
Solve 0.17y + 0.03(y + 9000) = 870
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