The term LD 50 refers to the concentration of a drug or chemical that will kill 50% of the population exposed to the drug. The LD 50 of Pb is 5 ppm. What is the LD 50 for Pb in ppt and ppb?

Q: A man travelled by car for 3 days. He covered 480 miles each day. On the first day he drove for 10…

A: Solution is given:

Q: Wendy has taken two tests with scores of 77 and80. To get an 82 average, what must her grade be on…

A: The average of three numbers is given by Average=Sum of all numberscount to total numbers.

Q: Jim has gotten scores of 67 and 69 on his first two tests. what score must he get on his final test…

A:

Q: Griffen has 3 less than 2 times as many stickers as Robin. Griffen has 25 stickers. How many does…

A: Please go through the questions word by word. First assume that Robin has x stickers & then…

Q: Skylar has a smart phone data plan that costs $50 per month that includes 7 GB of data, but will…

A: Given Smart phone data plan costs $50 per month includes 7GB of data. Will charge extra $30 per GB…

Q: Travis is playing a video game that has several levels. On Level 1, he earned x+ 1 points. On Level…

A: Points earned in first level = x+1Points earned in second level = 3x+1+2 = 3x+3(a)Let n be the…

Q: n of 13.8 percent, 5.3 percent, and 3.1 percent i

A: First, we need to obtain the average growth factor or the geometric mean. It is calculated as…

Q: The Alexander family and the Gray family each used their sprinklers last summer. The Alexander…

A:

Q: population in 1994 was about 5.63 billion, growing at a rate of 2% annually; What is the population…

A: Please refer to the image below

Q: A snack mix is made from peanuts that cost $3.30 per pound and caramel popcorn that cost $2.30 per…

A: To determine the amount of peanuts that cost $ 3.30 per pound and the amount of caramel popcorn that…

Q: Each morning during rush hour, 10,000 people want to travel from New Jersey to New York City. If a…

A: It is given that if x thousand people per morning drive to New York, it takes 20 + 5x minutes to…

Q: There were 570 students enrolled in a freshman-level chemistry class. By the end of the semester,…

A:

Q: In a video game you can earn point for passing a level and also a bonus, which is a percentage of…

A: Tokens earned in each level = t  points earned for each level = 3000 + .25t

Q: The average bowling score of the 5-member in Regional High School bowling team is 128. If all the…

A: We have to find

Q: A young superhero mixes up a batch of goo they can use to fight crime. The recipe for the goo…

A: W be the amount of water C be the amount of cola A be the amount of alcohol

Q: At a birthday party, there is a 750 g chocolate cake and a 600 g carrot cake. At the party, 50% of…

A: There are 750 g chocolate cake and 600 g carrot cake. The total weight of the cake w is: w=750+600…

Q: According to the CDC there were 597,689 deaths in the US in 2010 attributed to heart disease. The US…

A: It is given that, due to CDC there were 597,689 deaths in the US in 2010 attributed to heart disease…

Q: CoffeeAM sells chocolate-covered blueberries for $10.95 per pound and chocolate-covered strawberries…

A: topic - equation in one variable

Q: our sister, Tina, believes that consuming energy drinks after 4 p.m. makes it difficult for people…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: You have probably noticed that when you buy hot dogs and hot dog buns, the packages do not contain…

A: Let, We go to the store to buy Hot dogs and Hot dog buns.

Q: A ship that is in danger of sinking radios the Coast Guard for assistance. When the rescue  craft…

A:

Q: There were 510 students enrolled in a freshman-level chemistry class. By the end of the semester,…

A: Let x  be a number of students who failed 4 times the number of students who failed =4x…

Q: How do the number of people per hour compare between Station 1 and Station 2? * Your answer

A: To find the equation for the number of people going to station 2, the slope of the line is to be…

Q: Hannah and Andrea were selling tickets to the homecoming dance. They were set up in different…

A: Given information:- Hannah and Andrea were selling tickets to the homecoming dance. They were set up…

Q: Your friend wants to make some Arnold Palmer that has the same exact taste as yours, so the ratio of…

A: Given that, 20 oz of Arnold palmer is made up of 12 oz of iced tea and 8 oz of lemonade. A Friend…

Q: From a classroom of 26 students, the number of students taking Data Management is 13, the number…

A: Given Data: Total=26 n(D)=13 n(C)=9 n( either)=5

Q: You are serving honeydew melon for 200 people. Each serving will contain 3 ounces of cleaned…

A: To find the cost of the melon for 200 people

Q: A woman making $3000 per month has her salary reduced by 20% because of sluggish sales. One year…

A: A woman making $3000 per month has her salary reduced by 20% because of sluggish sales. One year…

Q: Susan’s average score for her first three psychology exams is 84. What must she get on the fourth…

A: Let a denotes the sum of the first three exam scores and let b denotes thescore on the fourth…

Q: Patrick gets paid three dollars less than four times what Kevin getspaid. If the number of dollars…

A: Number of dollars kevin gets paid = x Patrick gets paid three dollars less than four times what…

Q: A rowing club has 600 members. 60% of them are women. After 200 new members joined the club, the…

A: From the data given we can find the answer as below.

Q: There are 20 Cub Scouts in pack 753. The number of scouts is 10 more than 2 times the number of…

A:

Q: their most recent 8 mile training run, Pepe averaged a speed of 1/2 mile in 4.5 minutes,  while…

A: Correct ans is 60 minutes. Explanation is as follows:

Q: Find how many quarts of 5​% butterfat milk and 1​% butterfat milk should be mixed to yield 120…

A:

Q: Bob's bowling league had an average score of 212 and a SD of 8.  Bob's average is 224. Marietta's…

A: From the provided information, Bob’s bowling league average score (µ) = 212 and standard deviation…

Q: Mark has taken 3 tests this semester and his average is a 78%. He really wants to get his test…

A: I have provided solution in step2.

Q: The top three mothers day gifts are flowers, jewelry, and gift certficates. The total of the average…

A: The top three Mother’s Day gifts are flowers, jewellery, and gift certificates. The total of the…

Q: Find how many quarts of 4​% butterfat milk and 1​% butterfat milk should be mixed to yield 30 quarts…

A: Let x be the number of quarts of 4% butterfat milk. So, the number of quarts of 1% butterfat milk…

Q: There are 13 Cub Scouts in Pack 785. The number of scouts is 1 more than 4 times the number of adult…

A:

Q: Suppose Country A spent $50$⁢50 billion on national defense in 2012, which was 10%10% of total…

A: Given Data: Nation defense=$50 billion Government Spending=50/0.1=$500 billion   New Government…

Q: A roast turkey is taken from an oven when its temperature has reached 190 degrees Fahrenheit and is…

A: This is a problem with Newton's law of cooling.

Q: This pandemic, Abheedette learned to bake while on home quarantine. She also realized that she will…

A: Given problem is : This pandemic, Abheedette learned to bake while on home quarantine. Shealso…

Q: There are 25 cub scouts in pack 584. The number of scouts is 5 more than 5 times the number of adult…

A: Topic = Algebra

Q: A spa serves iced green tea with lemon for $2.50 per glass. What is the menu-item cost percentage…

A: Given  A spa serves iced green tea with lemon for $2.50 per glass Served cost for tea = $0.72 Cost…

Q: Approximately 50% of newborn babies weigh more than pounds. What percent of newborn babies weigh…

A: The mean is 7.5 and the standard deviation is 0.6.

Q: The chart below gives price and fuel efficiency for Ford Escape SUVs with conventional or hybrid…

A: 1)  The annual cost to drive the conventional Ford Escape (with average of 24 mpg) for 15,000 miles…

Q: The high attendance at this year's Vacation Bible School at highland church was 107 children. This…

A:

Q: Jayvee wanted to find out whether studying or having a good night sleep before exams would make…

A: A one sample t test is used to compare the population mean to a hypothesized value. A two sample t…

Q: One rule of thumb in the fast-food restaurant business is a "4 times markup": The price of a food…

A:

Q: The number of grade 10 learners at mzila secondary school was 127 In 2006 and 114 in 2007 what was…

A: Given Number of learners in 2006 is 127 andlearners in 2007 is 114We know that % decrease=-100 X…