1. the half-life of the radioactive element krypton-91 is 10 seconds. if 32
grams of krypton - 91 are initially present, how many grams are present
after 30 seconds? show the decay function. use a = aoekt

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years