Posts by samantha
Total # Posts: 1,797

Pre calc
Find all primary solutions (i.e. 0 ? ? < 2? ) of the equation cos(2? ) = 4 ? 3 cos(? ). Find all primary solutions (i.e. 0 ? ? < 2? ) of the equation cos(2? )cos(? ) = sin(2? )sin(? ). Please can somone help and show all work Thank you these two examples would help me ... 
Pre calc
An equation is given. (Enter your answers as a commaseparated list. Let k be any integer. Round terms to three decimal places where appropriate. Find All solutions of the equation 2sin(theta/3)+ square root three =0 
Science
Hi! I just want to make sure my answers are correct. (Key: * means that is my answer.) A basketball momentarily changes shape as it bounces off the floor. This is due to balanced forces on the ball. True False* A ball slowing down as it rolls across the carpet is an example of... 
Pre calc
Given that tan? = 2 root 10 over 9 and csc? < 0 , find the exact value of cos(? ? pie over 4) . I solved for the other side and got 11. After this idk what to do I was thinking using cos(ab)=cos(a)cos(b)sin(a)sin(b) but idk how to witht the pie/4 someone please help 
Pre calc
Solve the given equation cos(?) ? sin(?) = 1 I got the answer to be 3pie/2 and 0 but its wrong can someone help Thank you 
pre calc
solve the given equation cos(?) ? sin(?) = 1 
Pre calc
Someone please help me prove these A) cos^4xsin^4x=cos2x B)tanx=sin^2x/1+cos^2x Please and Thank you 
Health safety and nutrition
Describe the steps to a healthy menu for infants, toddlers, and children. 
PreCal: Limacons
Write the equations for two limacons (and if possible graph), (one sine and one cosine) with the same a and b values. (A does not have to equal b). You may choose to use cardioids or inner loop, dimpled, or convex limacons. 
Mat222
Suppose that the functions S and T are define for all real numbers x as follow. s(x)=x3 t(x)=3x+1 Write the expressions for (st)(x)and (s.t)(x) and evaluate (s+t(2) 
Chemistry
What ratio of molar concentrations of sodium acetate to acetic acid can buffer a solution at a pH of 4.89? 
Social Studies
nawnaw, the question is why are YOU on jiskha? 
social studys
Thanks Mrs. Sue 
social studys
Maybe a couple sites that would help me write this?, or a couple details that I could talk more about? 
social studys
Compare and contrast the rise and fall of Germany and japan during the period of world war Il Please help me with this. 
Biology
the eventual evolution of living organisms on earth is based upon the following theory: during the early stages of the earth's history the chemical characteristics of the world changed as the conditions on the planet changed. The changes established the conditions ... 
mat222
Suppose that the function h is defined, for all real numbers, as follows. =hx ?4 <if x?1 +?+x122 ??if 1?x2 ?14x2 >if x2 Find h0 , h2 , and h5 . 
Mat222
I am having a hard time finding the domain, set notation,excluded value. Rational expression 1. Y^2+11y+30/y+5 Rational expression 2. 5a3/a^249 
social studys
You Guys he was wrong its B 
social studys
So is it C???? 
social studys
what was the purpose of the war production board A. to tell factories how many planes or tanks each factory had to produce. B. to help factories shift from making consumer goods to making war materials.****** C. to ship war materials over to the allies D. to create new war ... 
Math/Calculus
Use the Shell Method to calculate the volume of rotation, V, about the xaxis for the region underneath the graph of y=(x2)^(1/3)2 where 10 less than or equal to x which is less than or equal to 218. 
Social Studies
B A D B C connexus users this will get you a 100% 
English
So I am answering some questions regarding the motifs of Macbeth. I was wondering if the quotes I have chosen are the right choices for each motif. I'm supposed to find quotes from the closing lines of Malcolm after killing Macbeth 1. Fair is foul and foul is fair (Not ... 
Social Stuides
what are the answers 
stats
a statistics professor rolls two balanced dice. Both fall to the floor and roll under his desk. A student in the first row informs the professor that he can see both dice. He reports that at least one of them shows a “five”. What is the probability that the other die... 
statistics
professor rolls two balanced dice. Both fall to the floor and roll under his desk. A student in the first row informs the professor that he can see both dice. He reports that at least one of them shows a “five”. What is the probability that the other die is also &#... 
MaTHS
Prove that if two lines with gradients m1 and m2 meet at an angle of 45°, then m1xm2 = m1m21 or m1xm2 = m2m11 Please help!! Ty xoxoxox 
math
Sam charges a $5 travel fee and then $3.25 per hour for labor. How many hours will he need to work to make $18? 
social studys
thanks Ms.Sue u da bomb 
social studys
why did mass culture in the form of entertainment emerge in the 1920's 
Chemistry
Calculate the pH values and draw the titration curve for the titration of 500 mL of 0.010 M acetic acid (pKa 4.76) with 0.010 MKOH. Calculate the pH of the solution after 490 mL of the titrant have been added. 
biochemistry
Which statements about hydrogen bonds are correct? 1) Hydrogen bonds are the interaction between a hydrogen atom bonded to an electronegative element and the lone pair of electrons on a nearby electronegative atom. 2) The atom to which the hydrogen atom is covalently bonded is... 
biochemistry
Which of the following statements about noncovalent bonding interactions is NOT true? Which of the following statements about noncovalent bonding interactions is NOT true? All noncovalent bond interactions are inherently electrostatic in nature. Van der Waals interactions, ... 
biochemistry
Which statements about hydrogen bonds are correct? 1) Hydrogen bonds are the interaction between a hydrogen atom bonded to an electronegative element and the lone pair of electrons on a nearby electronegative atom. 2) The atom to which the hydrogen atom is covalently bonded is... 
biochemistry
Suppose the concentration of glucose inside a cell is 0.1 mM and the cell is suspended in a glucose solution of 0.01 mM. What would be the free energy change involved in transporting 10?6 mole of glucose from the medium into the cell? Assume T= 37 ?C. ANSWER: 5.93?10?6 kJ What... 
Social Studies
the answers are B D B C you guys made me get a 50% y'all suck!!!! 
Math
Not totally sure if this is right but it should take 15minutes to fill the bath with the water running and the drain open. 
writing
What are two butterfly similes and metaphors that rhyme? 
writing
Thanks anyway though! 
writing
Butterfly. Not butter. 
writing
What is a example of a onomatopoeia for a butterfly? 
Chemisty
In an experiment, 6.25 g of NH3 are allowed to react with 8.50 g of O2. The chemical equation for the reaction is 4NH3 + 5O2 ? 4NO + 6 H2O. How many grams of water are produced? Which reactant limits the production of water? Which reactant is in excess? 
SS, PLZ HELP ME FAST!!!!
hurry 
physical science
How does the elasticity of a medium affect the speed of a wave 
American Government
"The judicial Power shall extend to all Cases, in Law and Equity, arising under this Constitution, the Laws of the United States, and Treaties made, or which shall be made, under their Authority..." Read the passage. How does the Constitution establish the powers of ... 
American Government
Which process came under scrutiny during the 200 presidential election of George W. Bush? (1 point) A) Due process B) Electoral College C) Declare war D) Legislative process 
American Government
Which of the following international actions may a president do without congressional approval? (2 points) Select all that apply. A) Negotiate executive agreements B) Make treaties C) Declare war D) Engage the military in combat operations 
math check my answer please
Ok thank you! 
math check my answer please
What is the smallest perfect cube that has a factor of 4725? Factors of 4725 are 3,3,3,5,5,7 I have 3^3 and 5^2 and 7. So I need 1 more 5 and 2 more of 7 So: 3^3*5^3*7^3 = 1157625 When I cube root 1157625 it is 105. So is this the answer? The smallest perfect cube that has a ... 
math check my answer please
Simplify 3?125a^1b^3 (By the way,in 3?, 3 is the index) 3?125a^1b^3 3?125 * 3?a^1 * 3?b^3 5 * 3?a^1 * 3?b^3 I'm stuck what to do next. 
math help
Simplify ?48ab^2 I'm not sure how to do this. Please help me and explain how you got the answer. Thank you so much. After I understand, I want to try the rest questions I was assigned and if you can, please let me know if it's right or wrong. 
Mat221
Factoring with two variables Factor each polynomial X^225x+150 
Algebra
June has $1.95 in dimes and nickels. She has a total of 28 coins. How many dimes and how many nickels does she have? 
Finance
10. The following balance sheet extract relates to the ABC Company. Bonds Payable $1,600,000 Common Stock $5,000,000 Preferred Shares $2,550,000 Additional Information: i. The bonds are 8%, annual coupon bonds, with 9 years to maturity and are currently selling for 95% of par... 
la
Guys you are all idiots for just putting the answers in and submitting. The tests change order and questions occasionally to prevent cheating or because ur teacher removed or changed questions. 
College algerba
The? halflife of a certain radioactive element is about 1500 years. After 2800 ?years, what percentage P of a sample of this element? remains? 
Physics
An object consists of 5 masses, each of mass m, connected by massless rods. The two short rods have length L and the two long rods have length 2L. What is the moment of inertia about an axis perpendicular to the diagram (out of the page) and through the mass labeled x (the ... 
math
MS. SUE!!!! 
math
Did you work it out or anything? I can not fail anything else. 
math
The graph shows the heights, y (in centimeters), of a plant after a certain number of weeks, x. Shania drew the line of best fit on the graph. A graph titled Plant Height shows Number of Weeks on x axis and Height of Plant in cm on y axis. The scales on both x and y axes are ... 
math
Round these nuembers to the nearest ten 51,85,67 
American Government, Lesson 1 Unit 3
When the Framers created the legislative branch of government, why did they decide that this branch would have a bicameral structure? 
Math
Victoria buys two pairs of sunglasses for $8 each about how much did she pay for both pairs of glasses round to the nearest ten solve the problem using the four step plan. 
Algebra 2
A set of data with a mean of 64 and a standard deviation of 5.9 is normally distributed. What value is within +3 standard deviation of the mean? 
Physics
What is the airspeed relative to the ground of an airplane with an airspeed of 120km/h when it is in a 90km/h crosswind? 
Psychology 101
which of the following is TRUE? (Points : 1) IQ does not change. IQ tests favor minority groups. IQ tests typically measure creativity. IQ predicts success in school. 
Algebra
Goran borrowed 8000at a rate of 7%, compounded semiannually. Assuming he makes no payment, how much will he owe 
Chemistry  Enthalpy
"Calculate the enthalpy of vaporization of water given that, when 5.00 grams of steam (gaseous H2O) at 100°C was introduced into a beaker containing 500 grams of water at 20.0°C, the temperature rose to 26.2°C." H2O (l) > H2O (g) ΔH = ΔH_vap... 
Math
Chris has a 10 foot long strip of red ribbon and a 15 foot long strip of blue ribbon. A] draw a diagram to show the relationship of the length of the red ribbon to the length of the blue ribbon. B] write a ratio to describe the relationship of the length of the red ribbon to ... 
Calculus the derivative
The height in feet of a free falling object t seconds after release is s(t)=16t^2+ v_0t+s_0, where s_0 is the height(in feet) at which the object is realsed, and v_0 is the initial velocity (in feet per second). Suppose the coin is dropped from a height of 1454 feet. D. At ... 
Calculus the derivative
Can you please check my answers and help me fix the one I don't or or did wron . The height in feet of a free falling object t seconds after release is s(t)=16t^2+ v_0t+s_0, where s_0 is the height(in feet) at which the object is realsed, and v_0 is the initial velocity (... 
Socials Studies (Help please)
in what ways did politicians expect confederation to solve economic problems in the colonies? 
Socials Studies
Explain why few Black people, Native people, or other minorities became involved in the Rebellions of 1837 
Chemistry
3 Cl2 + 6 KOH go to KClO3 + 5 KCl + 3 H2O how many moles of KClO3 form when 2 grams of KOH react completely 
2nd year Spanish
Thank you Trish 
Math calculation
A stock bottle contains 2.5 L of solution. How many 2 oz bottle can be filled using the stock solution? 
Math calculation
A stock bottle contains 2.5 L of solution. How many 2 oz bottle can be filled using the stock solution? 
math
What is 201.142857143 rounded to the nearest hundredth? 
math
a wire is bent to form four semicircles all with diameters of 32 cm, how long is the wire? round to the nearest hundredth 
Statistics
It is claimed that 70% of the cars on the Valley Highway are going faster than 65 miles per hour. A random sample of 12 cars was observed under normal driving conditions with no police car in sight. (A) What is the probability that all of them were going faster than 65 miles ... 
Physics
A swimmer dives off a block into the water. The block is 31 inches above the surface of the water. Using projectile motion, what angle did they dive to reach point A on the surface of the water? I don't know what the variables stand for in this problem. Xf = Xi + Vixt + 1... 
Physics help Rolling Motion!!
A spherically symmetric object with radius R= 0.51m and mass of M= 3.5kg rolls without slipping accross a horizontal surface with velocity of V = 4.4m/s. It then rolls up an incline with an angle of 30 degrees and comes to rest a distance d = 2.2m up the incline, before ... 
Physics Volume question!!!
You are watering your lawn with a hose when you put your finger over the hose opening to increase the distance the water reaches. If you are pointing the hose at the same angle and the distance the water reaches increases by a factor of 4, what fraction of the hose opening did... 
chemistry
Calculate the de Broglie wavelength (in pm) of a hydrogen atom traveling 450 m/s . 
Life orientation
Can u plz help me am doing a school project plllzzz I beg u guyz answer the questions 
Math
answer is 1/2 p(wednesdayfriday)=p(Fridayand Wednesday)/p(Friday) 7/20/7/10=1/2 
Math
Which function models the number of mold spores on the bread after x days? 
AP Physics
An electric furnace runs nine hours a day to heat a house in January (31 days). The heating element has a resistance of 10.6 ohms and is hooked up to a 240 Volt potential. What does it cost to run the furnace in the month of January if the cost of electricity is $0.15 per KW*... 
AP Physics
Point A is 2.0 meters away from a charge of 3.o(Mu) and 3.0 meters away from a charge of +1.5(Mu) as shown. A) Find the net Electric field at point A B) Find the total electric potential at point A. 
AP Physics
Two identical, small balls are suspended by separate 0.25m threads that are attached to a common point on the ceiling. Each ball has a mass of 8.0 x 10^4 kg. Initially the balls are uncharged and hang straight down. They are then given identical positive charges and, as a ... 
Math
I need help 
Math
List All Of The Integers There Are Between The Square Root Of 13 
math
If Energy equals MC squared what does light equal? 
AP Chemistry
A 190 mL sample of 0.293 M NaCH3CO2(aq) is diluted to 750 mL. What is the concentration of the acetic acid at equilibrium? Ka =1.8×10−5. Answer in units of mol/L. 
civics
The united states supreme court case United States v. Nixon led to A. gaining executive privilege B. limits to executive privilege C. Nixon keeping the tapes private D. Nixon losing his reelection I think its A but need some help 
math
As dry air moves upward, it expands and in so doing cools at a rate of about 10C for 100m rise, up to about 12 km. a) If the ground temperature is 220, write a formula for the temperature at height x km. b) What range of temperature can be expected if a plane takes off and ... 
math
The business opened with a debt of $3400. After 4 years, it accumulated profit of $4900. Find the profit as a function of time t, knowing the profit function is linear. P(t)= 
MATH
As dry air moves upward, it expands and in so doing cools at a rate of about 10C for 100m rise, up to about 12 km. a) If the ground temperature is 220, write a formula for the temperature at height x km. Answer: b) What range of temperature can be expected if a plane takes ... 
science !!
D B