Acrystallographer measures the horizontal spacing between molecules in a crystal. the spacing is 14.8 nm . what is the total width of a crystal in millimeters 105 molecules across? write your answer as a decimal.

Trish receives $450 on the first of each month. josh receives $450 on the last day of each month. both trish and josh will receive payments for next four years. at a discount rate of 9.5 percent, what is the difference in the present value of these two sets of payments?

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

X+y=-4 x-y=2 use elimination with adding and subtraction