The half-life of radium is 1620 years. find the constant k in the formula when the time is given in years. i am supposed to use y=ce^kt i think.

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

Can someone me with the property questions for 12 13 and 14 plz

Janet is rolling a number cube with the numbers one through six she record the numbers after each row if she rolls of keep 48 times how many times should she expect to roll a 4