The half-life of radium-226 is 1620 years. How much of one gram of radium-226 will remain unchanged after four half-lives?

a) 0.125 g

b) 0.50 g

c) 0.0625 g

d) 0.25 g

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Dan cut a rope 18 foot long into three equal pieces. Which expression does NOT equal the length of one of the pieces in feet? A) 18 : 3 B) 3⟌18 C) 18/3 D) 3 : 18

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Let f (x) = x^2-2x-4. What is the average rate of change for the quadratic function from x=-1 to x = 4? Enter your answer in the box. Show your work

Identify the statement as true or false. Explain your reasoning. The values of a sample statistic for different random samples of the same size from the same population will be the same.

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Write two like terms using whatever variable (s) you'd like. be sure to include exponents. explain why these are like terms.

When alexis works overtime (any hours over 40 hours a week), she is paid 1.5 times her regular hourly rate. in one week, she worked 51 hours. if her regular hourly rate is $7.05, how much did she earn that week?

You have 5,814 feet of rope that you need to cut into 27-foot sections. How many sections of rope will you have? a. 215 sections with 8 feet left over b. 215 sections with 9 feet left over c. 218 sections with 3 feet left over d.