The half-life of a radioactive substance is 15 years. A)Write an equation that can be used to determine the amount, s(t), of 200 grams of thissubstance that remains aftertyears. B)Determine algebraically, to thenearest year, how long it will take for110of this substanceto remain.

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels