a radioactive element has a half-life of 30 days. calculate the mass of the element that remains after 20 days if 100g of the element decays. Also, calculate the decay constant.

can someone please help me with this? Consumer MathWhich person uses the best cost saving strategy when deciding how to spend their money? A. Octavia bought the name-brand dish soap to be sure it was good quality. B. Jake paid the seller's full price for his used car to avoid someone else buying it. C. Tyrone waited for a sale so he could get a lower price on his new skateboard. D. Camilla bought her new computer immediately in case prices increased. Do you know this for social studies Proteins are one of the four maintypes ofbiomoleculesO livingO complex how is a school or reflection of a society?please help me to find it ! Question 3(Multiple Choice Worth 5 points)(LC)Read the paragraph. Then answer the question that follows.Perhaps you wanted pizza for dinner, but were out voted by the rest of the family who wanted chili. This is similar to what happens in a community. One person has to give up a right for the good of the group. Sometimes citizens' duties and rights conflict with each other. A good example is a public protest. People have the right to meet in groups and share ideas. However, a protest can disrupt traffic or other normal activities. A city must provide extra police protection to keep people safe. Therefore, the city has the right to require permission in advance for a protest. Government must make laws to balance the rights of individuals and different groups of people.What type of connection is used in the paragraph? Simile Contrast Category Analogy How do themes differ from periods as tools for understanding history?O A. A period examines how societies have changed over time, while atheme does not.B. A period is an objective set of facts, while a theme can beinterpreted in many ways.O C. A period focuses on broad ideas, while a theme focuses on peopleand events.O D. A period covers only a specific time frame, while a theme repeatsthroughout history. cuales son las razones por las que las colonias hispanoamericanas se revelaron contra Europa? what crimes are cctv and security lock designed to prevent? Two trucks left the warehouse at the same time and drove inthe same direction along a straight road. One truck drove at 68km/h while the other drove at 57 km/h. Find theirs distanceapart after2 hours. PLS HELPP6 times what =9?? In the following sentence, what is the purpose of the word old?The very old truck was in great shape.AIt is an adverb describing a verb.BIt is an adverb describing an adjective.C It is an adjective describing a noun.DIt is an adjective describing an adverb. Jace has consumed 1,500 calories so far today. He has also burned off 400 calories at the gym. He would like to keep his daily calorie total to 1,900 calories per day. How many calories does he have left to consume for the day? Is 1,100 a viable solution to this problem? Yes; 1,100 is less than 1,500. No; 1,100 is more than the 400 he burned off at the gym. No; 1,100 will cause him to exceed 1,900. Yes; 1,100 is less than 1,900. What is one Similarity and Difference about The northeast and the west and how the environment impacted their way of life? If f(x) = x (ln x), find f'(x).A. e^(x + 1)B. 1 + ln xC. 1 + e^xD. (ln x)^2 + x how to prepare jollof rice in french (-4+ 8x) +3>What is the solution to the inequality-4? what is text or picture behiind the document called ? A truck can be rented from Company A for $120 a day plus $0.20 per mile. Company B charges $60 a day plus $0.40 per mile to rent the same truck. Find the number of miles in a day at which the rentals cost for company A and company B are the same.please help.. Line segment JM has endpoints with coordinates 0 and 25 on a number line. Points K and L are on segment JM. K has a coordinate of 5 and point L has a coordinate of 12. Find the probability that a point on JM is placed first on JL and a second point is not placed on KL.