Aradioactive substance has an initial mass of 100 grams and its mass halves every 4 years. which expression shows the number of grams remaining after t years?

1) 100(4)^t/4
2) 100(4)^-2t
3)100(1/2)^t/4
4)100(1/2)^4t

The measure of the angles of triangle abc are given by the expressions in the table. angle-measure a-48 degrees b-(6x-28)degrees c- (2x) degrees find the value of x. then find the measures of angles b and c. enter your answers in the boxes. x= m m

Which of the following would represent the sum of 3 consecutive integers if x is the first integer?

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?