the half life of radium-226 is 1600 years. after how many half-lives would 25% of the radium-226 remain?

Explain the formation of planets based on our knowledge of the solar system newton's second law of motion States that the acceleration of an object is directly proportional to the force exerted on the object. if an object accelerates at a rate of 3 m/s2 , it will exert a force of 15 N. how much force will the same object exert if it accelerates at a rate of 7 m/s2? pls pls pls help () I'll give brainliest if correct. File included down below Please solve the math problem for me... I will mark you brainliest 8 kg of potatoes and 5 kg of carrots cost $28 whereas 2 kg of potatoes and 3 kg of carrots cost $11.20. Find the cost of 1 kg of each item.also give the explanation. ca anyone help with this Spanish pronoun worksheet What is590in decimal form? How did Pulitzer and Hearst stroke tensions between the US and Spain 33) 1 e = ........ O 1.6*10^-27 O * 1.6 *10^-19 O 1.66 * 10^-19 o 1.66* 10^-27 Your parents have travelled you have not paid your school fees write a letter to your fathers friends Mr Owusu to pay for you when your parents return they will pay back how did near sighted people deal with life in the ancient period meaning of accountancy??wrong answer will be reported Simplify the expression the square root of 4x^2/3y. Show your work. how many miles of concrete road were there in the U.S. in 1900? What's the product of -2 1/4 and 2 1/2 Someone help me with this I will make you brain I need some help with this plz Yo can y'all help me with this I already did it on another paper. It would be very helpful if it was a step by step explanation take 100 points brother Christopher Columbus made four voyages.First voyage:1492-1493Second voyage:1493-1496Third voyage:1496Four voyage:1502-1504How many total years did Christopher Columbus spend on his four voyage? what are 5 different bases for birds