# karen

Newest questions and responses by karen-
## Ap Calculus

Find the area of the region bounded by the curves y=x^2-1 and y=cos(x). Give your answer correct to 2 decimal places

*asked on February 13, 2019* -
## Math

write and solve two subtraction problem that show how many of each animal therw might be. then write the numbersthey are four different kind of animals on the farm there are 19 More cows than sheep there are 19 more ducks than hens there more hens than cow

*asked on January 14, 2019* -
## Calculus

Given f'(x)=(2-x)(6-x), determine the intervals on which f(x) is increasing or decreasing Options: 1) Decreasing (-∞,2); increasing on (6,∞) 2) Decreasing (2,6); increasing on (-∞,2)U(6,∞) 3) Decreasing (-∞,2)U(6,∞); increasing on (2,6) 4)

*asked on December 26, 2018* -
## Calculus

A particle moves along the x-axis so that at time "t" its position is given by s(t)=(t+3)(t-1)^3 ,t>0 For what values of "t" is the velocity of the particle increasing? a) 00 d) the velocity is never increasing

*asked on December 26, 2018* -
## Calculus

Find the absolute maximum value for the function f(x)=x^2 - 3 , on the interval [-4,0) U (0,3]

*asked on December 26, 2018* -
## Calculus

In the space below, provide the larger of the positive integers that add to 10 and have the largest possible product

*asked on December 26, 2018* -
## Calculus

If f(x) is a continuous function defined for all real numbers, f(-1)=1, f(-5)=-10, and f(x)=0 for one and only one value of x, then which of the following could be that x value? a) -6 b) -5 c) -4 d) 0

*asked on December 20, 2018* -
## Calculus

If f is a function such that (f(b) - f(a))/(b-a) =2, then which of the following statements must be true a) f(a) = f(b) =2 b) the slope of the tangent line to the function at x =a is 2 c) The average rate of change of the function on the interval [a,b] is

*asked on December 20, 2018* -
## Calculus

A gallon rises at the rate of 8 feet per second from a point on the ground 12 feet from an observer. To 2 decimal places in radians per second, find the rate of change of the angle of elevation when the ball on is 9 feet above the ground. Type your answer

*asked on December 19, 2018* -
## Math quadratic equation

2/x+5 - x/x-5 =1 I multiplied both side by (x+5) (x-5) or by x^2 -25 and I arrive at -x^3+x^2+25x-25 =0 And now I am stuck. Thanks for any help

*asked on November 10, 2018* -
## Calculus

Which of the ff function cannot be expressed in explicit form of dy/dx 4x+4y=2 xy-y^2=1 ycosx=5 My answer is ycosx=5

*asked on November 5, 2018* -
## Math

Jerry spent 1/5 of his allowance on a book and 3/8 on a book. He remained with $12.00. Calculate Jerry allowance, the cost of the book and the cost of the pen

*asked on September 27, 2018* -
## Math

One out of 37 high school ball players play college ball. one out of 22 college players play professional ball. what fraction of high school players play professional ball?

*asked on September 26, 2018* -
## Chemistry

How much heat is required to convert 9.00 g of water at 100°C into steam at 100°C, if ∆Hvap for water = 40.7 kJ/mol?

*asked on July 28, 2018* -
## Chemistry

If 4.39 g AlCl3 is dissolved in enough water to make exactly 100.0ml of a solution, what is the molar concentration of the chloride ion?

*asked on March 31, 2018* -
## science

1. all of the life functions are carried out by cells in a living organisms in order to A. Perform Synthesis B. Maintain Homeostasis C. Keep an Internal steady state D. Both c and d 2. If an -------------------- were digested the product would be

*asked on March 17, 2018* -
## Science-9

The weight of the nucleus is known as the? atomic mass?

*asked on December 11, 2017* -
## Chemistry

29.25g of sodium chloride is added to water and undergoes electrolysis according to this equation 2Cl-=Cl2 Calculate the mass of chlorine produced. I am lost with this one !

*asked on December 3, 2017* -
## Chemistry

Glucose( C6H12O6) is produced by photosynthese. For every kilo of water the plant takes in ,how much glucose can it make ? I done the balanced equation wich is (I think) 6H2O+6CO2 = C6 H12 3O6 After that I get a ratio of 108/372 wich give me a tota of 3444

*asked on December 3, 2017* -
## Math

please help find the inverse function f-1(x) if f(x)=10^(3x) f(x)=log2(4x) Thanks a lot

*asked on October 15, 2017* -
## Math

I need help, please find the exact value of 2log3 27+log3 (1/3)-log3 3^1/2 many thanks

*asked on October 10, 2017* -
## anthropology

2 key differentiators and 2 examples of anthropology compared to history and sociology. I found the definitions of each- Cultural anthropology-study of living people and cultures and they actually live with the people they study Archaeology- a subclass of

*asked on September 26, 2017* -
## Math

A digital clock shows either 3 or 4 digits at a time. What time do the digits have the greatest sum!

*asked on August 24, 2017* -
## Chemistry

The radius of a magnesium atom is 160 pm & its mass is 4.04 X 10^-23 g. What is the density of the atom in grams per cubic centimeter? Assume the atom is a sphere with: Volume= (4/3)*pi*r^3

*asked on August 23, 2017* -
## Biochemistry

What is the condensed structural formula of cyclopropane?

*asked on August 21, 2017* -
## Math

A Texas oil drilling company has determined that it costs $25,000 to sink a test well. If oil is hit, the revenue for the company will be $500,000. If natural gas is found, the revenue will be $150,000. If the probability of hitting oil is 3% and of

*asked on August 2, 2017* -
## math

what is the effective interest rate of an 8% 13-week treasury bill? assume it is a $10,00 treasury bill, and round to the nearest hundredth percent

*asked on June 5, 2017* -
## Statistics

A company makes batteries with an average life span of 300 hours with a standard deviation of 75 hours. Assuming the distribution is approximated by a normal curve fine the probability that the battery will last . Less than 250 hours b. Between 225 and 375

*asked on April 27, 2017* -
## Algebra 2

E6------E= -0.378eV E5------E= -0.544eV E4------E= -0.850eV E3------E= -1.51eV E2------E= -3.40eV Use the figure shown above to determine how much energy a hydrogen atom with its electron in the E2 energy level must absorb for the electron to be removed

*asked on April 24, 2017* -
## Math

There is 5 gallons of pineapple juice and I have a six oz glass how many drinks do I get out of the five gallon jar ?

*asked on March 31, 2017* -
## chemistry

Calculate the concentration of all species in a 0.20 M KF solution.

*asked on March 7, 2017* -
## Math

What is the approximate circumference if diameter is of 23 feet

*asked on February 28, 2017* -
## Math

Place parentheses in the expression to make it equal 60? 2×6+6+3×2

*asked on February 16, 2017* -
## Pre-Calculus

How to solve sin(x/2) = 1 - cos x? I know you would use the half angle identity sin(x/2) = +-(√1 - cos x/2), just don't know what to do from there.

*asked on January 30, 2017* -
## Pre-Calculus

How to solve sin(x/2) = 1 - cos x? I know you would use the half angle identity sin(x/2) = +-(√1 - cos x/2), just don't know what to do from there.

*asked on January 30, 2017* -
## Math

when z is divided by 8, the remainder is 5. What is the remainder when 4z is divided by 8. Can you please explain this to me step by step? I'm having difficulty understanding why the answer is 4

*asked on January 26, 2017* -
## Math geometry

The measure of an angle is twenty more than three times it's supplement. What are the measures of each angle?

*asked on January 24, 2017* -
## Geography

The distance between station x and y on the map is 7cm. Find the actual ground distance between the two stations if the map scale is 1:100000

*asked on January 15, 2017* -
## Physics

A table is supported against a wall forming an angle with the vertical. The coefficient of static friction between the table and the floor is (μe). The frictional force of the wall on the board may be neglected. Find an expression for the maximum value

*asked on December 13, 2016* -
## American Government

Why did the framers insist that federal judges be appointed for a lifetime of service?

*asked on December 12, 2016* -
## Physics

How long does a car with an acceleration of 2.0 m/s2 take to go from 10 m/s to 30 m/s a. 3 m b. 6 m c. 18 m d. 36 m

*asked on December 8, 2016* -
## Algebra

The total tickets sales for a highschool basketball game were $2.00. The tickets price for students was $2.25 less than the adult ticket price. The number of adults tickets sold was 230, and the number of students tickets sold was 180. What was the price

*asked on December 7, 2016* -
## Statistics

A random sample of size n is to be drawn from a population with a mean = 500 and sd = 100. What sample size would be necessary to ensure a standard error of 25? Sample sizes are whole numbers.

*asked on November 15, 2016* -
## algebra

if Sam invested $10,000 at simple interest, some at 3% and some at 4% and paid $320 , what was the amount invested at each rate?

*asked on November 14, 2016* -
## Pre-Calculus

The amount of force required to compress a spring is inversely proportional to the distance that it has been compressed. For one certain spring, it takes 5 pounds of force to compress it from its natural length of 18 inches down to 12 inches. How much

*asked on November 14, 2016* -
## Stoichiometry

Equation to use Al + Cl2 -> AlCl3 You have 8.6 moles of aluminum, how much in moles of chlorine do you need to react completely? Desperate. Trying to teach daughter on the spectrum and I'm stumped on how to start.

*asked on November 13, 2016* -
## Math

For every 5 highlighters that Agnes buys , she gets 1 free. If Agnes needs 80 highlighters, what is the least number of highlighters she has to buy?

*asked on November 12, 2016* -
## Math

Aaron and Ben have a total of 976 trading cards. Ben has 7 times as many cards as Aaron. How many cards should Ben give Aaron so that Aaron will have 3 times as many cards as Ben?

*asked on November 12, 2016* -
## Math

The temperature at 8:00 a.m. was 46°F. By 1:00 p.m. it was 18° warmer. Which equation would help you figure out what temperature it was at 1:00 p.m.?

*asked on November 9, 2016* -
## chemistry

The amount of lead in drinking water is 0.025 mg/L. Express this concentration in molality. {molar mass of lead is 207.2 g/mol and the density of water is 1.00 g/cm.}

*asked on November 5, 2016* -
## chemistry

Molarity material = density x 1000 x (%/100) x (1/molar mass material) 1000 indicates?

*asked on November 4, 2016* -
## chemistry

How many milliliters of concentrated nitric acid, HNO3, 70 % (wt/wt) are required to prepare 1 liter of 0.250 M solution? The molar mass and density of HNO3 are 63.0 g/mol and 1.36 g/cm respectively.

*asked on November 4, 2016* -
## Math

The price of a home is 177,000. The bank requires a 20% down payment and three points at the time of closing. The cost of the home is financed with a 30-year fixed-rate mortgage at 10%.

*asked on October 24, 2016* -
## math

A bird beats it's wing 24 times per second. How many times will it beat it's wing in one hour

*asked on October 22, 2016* -
## Math

A total of 120 students attend top view high school.the ratio of teachers to students is 1:30. Whats the answer

*asked on September 22, 2016* -
## Math

120 students attend top view high school.the ratio of teacher to students is 1:30.

*asked on September 22, 2016* -
## Math

During summer vacation, Sanjay writes letters and postcards to his friends at home. A letter costs $0.41 to mail and a postcard costs $0.21 to mail. Sanjay writes to 8 friends and spends $2.08. How many letters and postcards he sends.

*asked on September 18, 2016* -
## Math question urgent

Mrs. Hart, at age 65, can expect to live for 25 years. If she can invest at 8% per annum compounded monthly, how much does she need now to guarantee herself $300 every month for the next 25 years? Present Value = 900(1 - 1.0041666..)^-300)/.0041666... =

*asked on September 17, 2016* -
## Math

Mrs. Hart, at age 65, can expect to live for 25 years. If she can invest at 8% per annum compounded monthly, how much does she need now to guarantee herself $300 every month for the next 25 years?

*asked on September 16, 2016* -
## math

Jeremy takes out a 30-year mortgage of 220000 dollars at an annual interest rate of 7 percent compounded monthly, with the first payment due in one month. How much does he owe on the loan immediately after the 87th payment? I have tried 204311.1024, but

*asked on September 16, 2016* -
## Math

A ship starts at port P, sails 226 deg (T) for a distance of 120 km. 1. How far south of P is it? 2. How far west of P is it?

*asked on September 4, 2016* -
## physics

you walk 95.0 m at a speed of 1.26 m/s and then run 95.0 m at a speed of 3.61 m/s. what is the average velocity?

*asked on August 21, 2016* -
## World history

1Which of the following would john locke most favor Republic Oligarchy Theocracy Absolute monarchy 2Whay was james i resistant to working with parliament He believed in the absolute power of kings He did not agree with the policies of the prime minister

*asked on August 10, 2016* -
## Management Science

For your phone calls, you can either A) buy a prepaid monthly plan, or B) pay as you go. A cost $50 per month and calls are free up to 8hrs. Any extra min for that month will cost you $.25. B has a cost of $.15 per minute. What are the two total cost if

*asked on June 17, 2016* -
## chem II

calculate the number of moles of solute present in 50.0g of an aqueous solution that is 1.5m NaCl.

*asked on May 2, 2016* -
## MATH

The Eiffel Tower has a surface area of approximately 76,000 square meters. A restoration company charges $80 per sq yard for re-painting. How muuch will it cost to paint the Eiffel Tower

*asked on May 2, 2016* -
## Accounting 220

On January 1, 2014, Muoy Machining Co. purchased a compressor and related installation equipment for $72,500. The equipment had a three-year estimated life with a $12,500 salvage value. Straight-line depreciation was used

*asked on April 30, 2016* -
## Math

Allan gave 5/8 of his money to his son and then gave his daughter 1/2 of the remainder. He kept $150.00 for himself. How much money did Allan have at the beginning? How much money did his son get?

*asked on April 27, 2016* -
## BRCharter Academy

Explain how the line plot would change if you measure a purple pen that is inches long

*asked on March 3, 2016* -
## Chemistry

How many millimoles of HCl (aq) are neutralized by 0.35 g of CaCO3 (sol)? mmol

*asked on March 2, 2016* -
## Statistics

A volunteer ambulance service handles 0 to 5 service calls on any given day. The probability distribution for the number of service calls is as follows: one column has number of service calls (X) those numbers are 0 1 2 3 4 5. The next column Probability P

*asked on February 13, 2016* -
## Chemistry

Three isotopes of Neon occur naturally: 20Ne (mass = 19.9924 amu) 21Ne (mass = 20.9938 amu) 22Ne (mass = 21.9914 amu) If the percent abundance of 21Ne is 0.2600, what is the percent abundance of 20Ne? How do I set up for these type of problems. I tried

*asked on February 12, 2016* -
## Chemistry

How do you Find the mass (in g) of Carbon in 2.980 g Carbon dioxide? I saw the question asked before but couldn't find a solution.

*asked on February 12, 2016* -
## math

Area of a triangle is72cm squared base=12 height=?

*asked on February 11, 2016* -
## chemistry

A metal tank contains three gases: oxygen, helium, and nitrogen. If the partial pressu of the three gases in the tank are 5 atm of O2, 900 mm Hg of N2, and 1.4 kPa of He what total pressure inside of the tank?

*asked on February 1, 2016* -
## COLLEGE ALGEBRA

Find the dimensions of a rectangle with a Perimeter of 100 cm - its width is 2/3 its length.

*asked on January 31, 2016* -
## Chemistry

How many grams of aluminum sulfate are produced if 15.7 g Al reacts with excess CuSO4?

*asked on January 20, 2016* -
## Check my answers Ms. Sue?

I posted this in my last question but its not showing up for me.. But i have redone the questions you said were wrong and i was hoping you would check them again 1. How did the southern economy change after the Civil War? Shipped raw materials to northern

*asked on January 19, 2016* -
## World History Check my answers

Okay so i put a star* by each of my answers.

*asked on January 19, 2016* -
## Chemistry

A 50.0g sample of copper at 10.0 C is placed in 200.0g H20 at 40.0 C in a calorimeter. Heat flows from the water to the copper until both are at 39.3 C. What is the specific heat of copper? (Csp H20 is 4.18J/g*C.) I don't have any idea how to do this

*asked on January 13, 2016* -
## Math

Two ships leave port at 4 p.m. One is headed N38°E and is travelling at 11.5 km/h. The other is travelling at 13 km/h, with heading S47°E. How far apart are the two ships at 6 p.m.? i am in grade 11 :), studying ahead of the class :) its 8 pm here, this

*asked on January 3, 2016* -
## math

Two ships leave port at 4 p.m. One is headed N38°E and is travelling at 11.5 km/h. The other is travelling at 13 km/h, with heading S47°E. How far apart are the two ships at 6 p.m.?

*asked on January 1, 2016* -
## Hunt

Wyatt and Allyson were asked to solve a percent problem using the number 13 and 38. Wyatt found 13% of 38 and allyson found 38% of 13. Explain why they both got the same answer. Would this work for other numbers as well? Why or why not?

*asked on December 8, 2015* -
## Physics

A 5000 kg truck rear ends a 2500 kg car. Both vehicles applied brakes at the moment of the impact and began to skid. After the impact, the acceleration of the truck is -2 m/s and the acceleration of the car is -3 m/s. If the car skid for 30 m and the truck

*asked on December 4, 2015* -
## Math

Part A: Max rented a motorbike at $465 for 5 days. If he rents the same motorbike for a week, he has to pay a total rent of $625. Write an equation in the standard form to represent the total rent (y) that Max has to pay for renting the motorbike for x

*asked on November 25, 2015* -
## science

A glass bottle has a volume of 1L and weighs 500g. When half filled with oil, it weighs 1750g. What is the density of the oil in the bottle?

*asked on November 22, 2015* -
## chem

The mystery compound CxHy is completely reacted with O2 to yield 44 gr CO2 and 18gr H2O. What is the empirical formula of CxHy? I got : C1H2 How much O2 in grams was used in this reaction??

*asked on November 3, 2015* -
## chem

Assume that the atomic diameter of an atom of element X is 2A and that 1.0 x 10(16th) atoms are arranged in a simple 2D square array. What is the length of each side in cm?

*asked on November 3, 2015* -
## chem

Consider the unbalanced reaction CO + H2O > CH4 + O2. All reactants in the gas phase. Calculate the H per mole of H2O reacted.

*asked on November 3, 2015* -
## chem

When balancing the following, what is being reduced, what are the reducing agents, and what is the initial and final oxidation states of the reduction agent? Fe3O4(s) + C(s) > CO2 (g) + Fe

*asked on November 3, 2015* -
## chem

Fe3O4(s) + C(s) > CO2 + Fe Balance the chemical reaction and calculate how many moles of Fe3O4 must be reacted to produce 440 gr CO2 (the > is an arrow)

*asked on November 2, 2015* -
## chem

2.0 x 10(exp-13) km/0.01=

*asked on November 2, 2015* -
## chem

Consider the unbalanced reaction CO + H2O > CH4 + O2. All reactants in the gas phase. Calculate H per mole of H2O reacted. (The > is an arrow)

*asked on November 2, 2015* -
## Statistics

At the end of the Halloween Festival the organizers estimated that a family of participants spent an average $45.00 with a standard deviation of $12.00. What’s the probability that the mean amount spent will be between $20 and $30?

*asked on October 21, 2015* -
## 6th Grade Math

Caleb sold boxes of candy. Some sold for $2, and some sold for $3. He sold a total of 35 boxes and received $92. How many boxes did he sell for $2?

*asked on October 7, 2015* -
## Distributed Management System

what is the crow's foot ERD of this problem?

*asked on October 4, 2015* -
## Math

Ryan's average for 5 arithmetic test was 89. On four of the tests he made 96,86,92, and 80. What did he make on the fifth test?

*asked on October 2, 2015* -
## Math

A recipe or trail mix calls for 1/4 cups of raisins, 1 1/2 cups of granola, 1/2 cup of mixed nuts, and 1/8 cup of chocolate chips. What fraction of each ingredient is required to make 5 1/2 recipes

*asked on September 24, 2015* -
## Physics

The tortoise and the hare are in a race of 1000m distance. The tortoise travels the entire race at a speed of 2.0 m/s while the rabbit runs the first 200 m @ 2.0 m/s. Then he stops to take nap for 1.3 hrs and awakens to finish the last 800m with an average

*asked on September 22, 2015* -
## geometry

M is the midpoint of JK. find the coordinates of K. 1. J (-8,4) M (-1,1) 2. J (9,-5) M (5, -2) 3. J (0,11) M (-3,2)

*asked on September 21, 2015*