Please Help The half-life of radium-222 is approximately 38 seconds

How much of a 4 gram sample of radium-222 would remain after 44 seconds? Round to three decimal places.

Which of the following is the correct ratio for converting kilograms to grams

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept