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General
4 months ago
Billy is monitoring the exponential decay of a radioactive compound. He has a sample of the compound in a test tube in his lab. According to his calculations, the sample is decaying at a rate of 35% per hour. There are at least 72 grams of the sample remaining. Once the sample reaches a mass of 15 grams, Billy will continually add more of the compound to keep the sample size at a minimum of 15 grams. If R represents the actual amount of the sample remaining, in grams, and t represents the time in hours, then which of the following systems of inequalities can be used to determine the possible mass of the radioactive sample over time?
General
4 months ago
A brother and a sister invested part of their $600 of allowance money at 4% and the remainder as 7%. Their annual income from these two investments was equivalent to an income of 6% on the entire sum. How much was invested at each rate?
General
4 months ago
A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 15 subjects had a mean wake time of 100.0 min. After treatment, the 15 subjects had a mean wake time of 92.6 min and a standard deviation of 43.7 min. Assume that the 15 sample values appear to be from a normally distributed population and construct a 99% confidence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of 100.0 min before the treatment? Does the drug appear to be effective?
General
4 months ago
The table below represents the closing prices of stock ABC for the last five days. What is the r-value of the linear regression that fits these data?DAY VALUE1 24.312 23.313 23.014 23.165 23.27A. -0.69771B. 0.56941C. -0.68427D. 0.89215
General
4 months ago
At the beginning of 2002, an ice cream shop claimed to have "nearly 969 different ice cream flavors." Assuming that you could choose from 969different flavors, that you could have your ice cream in a cone, a cup, or a sundae, and that you could choose from a dozen different toppings, how many different desserts could you have?
General
4 months ago
Which of these are mathematical laws that help us solve numerical problems? decimals graphs formulas percentages fractions
General
4 months ago
Give the demensions of a right triangle and a pararalogram with the same area
General
4 months ago
deanna gets 3 problema incorrect on her math quiz. her score is 85%. how many questions are on the quiz
General
4 months ago
A small bag of trail mix contains 3 cups of dried fruit and 4 cups of almonds.A large bag contains 41/2 cups of dried fruit and 6 cups of almonds. Write and solve a system of linear equations to find the price of 1 cup of dried fruit and 1 cup of almonds if the Price of small bag is $6 while $9 for large bag.
General
4 months ago
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