Suppose 2kg of a radioactive substance decays to 250g in 75years. what is the half-life of the substance?

Evaluate the expression when x=3 and z=-6. z:x=

Which of the following is the graph of y = x2 + 2x + 1

Pythagoras Theorem and Quadratic Equations Solve for x: a = (x-2) b = 9 c = (x+1)

Angel has twice as many marbles as Susan together they have 36 marbles how many marbles does Angel have

113.0975 to 3 significant figures

Two groups of tourists each have 60 people. If 3/4 of the first group and 2/3 of the second group board buses to travel to a museum, how many more people in the first group board buses than in the second group?

How do you write this polynomial in factored form? x^3+7x^2+10x

Simplify the equation - 3 (5-7x)

My question is below. M/pie = 7.3

Suppose Phil and Kate decide to drive the sports car to Nashville without stopping and they want to arrive by 5:00pm. What time should they leave their house? It's takes 7 hours and 52 minutes to get to Nashville.