After 1.3 billion years what percentage of Pottasium-40 is left? After 2.6 billion years what percentage of Pottasium 40 is left ?
After 2.6 billion years what is the percentage of Argon? Please help

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

Aperson standing in a canoe exerts a force of 700 n to throw an anchor over the side. find the acceleration of the canoe if the total mass of the canoe and the person is 100 kg?

Can anybody me with this? ? (picture included.)