Posts by angel
Total # Posts: 1,235

science
differences between rotation and revolution of the earth 
civic
advantages of confedral constitution 
math
5  2.25 = 2.75 = or less than 2.75 
Chemistry
If you have 10.00 mL of 0.5875 M H3PO4, how many mL of 0.2625 M NaOH are needed to reach the point of complete neutralization? 
chemistry
The basicity of tetraoxosulphat(iv)acid is 2 explain this statement with an equation showing the reaction between the acid and potassium hydroxide 
math
How many ways can I select 5 pieces of fruit from apples, oranges, strawberries and pears (I have at least 5 of each)? 
Math
There are 20 red, 20 green and 20 blue balls in an urn. In how many different ways can 10 balls be selected? How many ways are there if there are 6 red balls instead of 20? 
Chemistry
For who needs it in the future: 5.00mg Si / 1000 mg Si = 0.005g Si (0.005)((1e5)/100g Si) = 5.00e10 ((5.00e10)(6.02e23))/(31 g P) = 9.71e12 atoms P 
Chemistry
Suppose that a device is using a 5.00mg sample of silicon that is doped with 1 × 105% (by mass) phosphorus. How many phosphorus atoms are in the sample? 
Health
:) 
Health
Thank You Writeacher !!!!! 
Health
1. Identify a common defense mechanism that protects you from an uncomfortable feeling. A. reaction formation *** My Answer B. abstinence C. mature behaviors D. acceptance 2. Anger is a normal emotion that all humans feel at some time. It is important to express this emotion ... 
algebra
3 
Probability
How??? Solution and explanation pleaseeeee 
Probability
Based on experience, the manager of a credit card company reports that three out of every ten credit card applications are disapproved. Use the normal approximation to determine the probability that at most 50 of 200 new credit applications will be rejected. 
Probability
Answer and solution pleaseee 
Probability
Suppose that the lifetime of a farm tractor follows a normal distribution with a mean of eight years and a standard deviation of 1.7 years. If the manufacturer is willing to replace only 5% of the tractors that fail within the warranty period, how long should the warranty ... 
Probability
Solution pleaseeeee 
Probability
Gani, a regular coffee drinker, goes to his favorite coffee shop every night for a cup of hot cappuccino. The amount of time that he stays in his favorite spot is normally distributed with a mean of 45 minutes and a standard deviation of 5 minutes. Above how many minutes are ... 
Probability
Suppose that a drug is known to be 90% effective in treating a certain disease. What is the probability that it will be successful in treating seven to ten out of 12 patients with the disease? 
Physics
A charge +q is at the origin. A charge 2q is at x = 6.30 m on the +x axis. (a) For what finite value of x is the electric field zero? (b)or what finite values of x is the electric potential zero? (Note: Assume a reference level of potential V = 0 at r = ?.) Smallest value of ... 
Math
Why did they remove my question about youtube? That's what i'm learning in school 
Geometry
We can help if you post the ones you need help with 
Probability
In a university, 30% of the students major in Business management, 25% major in mathematics and 10% major in both business management and mathematics. A student from this university is selected at random. A) what is the probability that the student majors in business ... 
Math
unpaired 
Math 6A
1. 6*0.05 = ? 2. CORRECT! 
Question!!
I don't quite understand why we had to do 1.5/.054 ? Like what is the reasoning behind it? Why didn't we just do F=(q1q2)/r^2 where r would now be 0.054? and if we can't do this why is it wrong to do this? Really appreciate the help! 
Physics
A +33.0 nC charge is placed at the origin of an xycoordinate system, and a ?25.0 nC charge is placed at the point (1.500 m, ?0.0540 m). (a) Determine the magnitude and the direction of the force that the positive charge exerts on the negative charge. Use ijk notation for your... 
Math
220 (35*4) = ? 
math
numbers of ways a person can travel from a to c via b, if there are 3 routes from a to b and 5 routes from b to c 
Statistics
A committe of 5 members will be chosen from a group of 10 teachers and 5 students. What is the probability that the committee will have A) all teachers? B) 3 teachers and 2 students? C) 3 or 4 teachers? 
Statistics
A committe of 5 members will be chosen from a group of 10 teachers and 5 students. What is the probability that the committee will have A) all teachers? B) 3 teachers and 2 students? C) 3 or 4 teachers? 
math
The square root of the product of 4 and a number is 26 
Calculus
Thanks Steve for your explanation. The questions never gave how deep the water is, which was why I was a bit thrown off. 
Calculus
water drips into an upside down cone, whose diameter at the base is 10 cm , and whose height is 15 cm. If the water is dripping int a rate of 2cm^3 per minute, how fast is the height rising. 
Math please help !!!!!!
How many blocks 1 inch on each edge would it take to fill a shoe box that is 12 inches long , 6inches wide , and 5 inches high ? 
Physical Science A
hallium206 decays by beta emission to make the next element to the right in the periodic table (lead206) 
linear algebra
Find the scalar equation for the plane passing through the point P=(0, 2, ?1) and containing the line L defined by x = 2+t y = 4+t z = ?6+7t 
linear algebra
Let L1 be the line passing through the point P1=(9, 0, 0) with direction vector ?d1=[3, 2, ?2]T, and let L2 be the line passing through the point P2=(?10, 8, 4) with direction vector ?d2=[3, 0, 2]T. Find the shortest distance d between these two lines, and find a point Q1 on ... 
Algebra
1.What is the slope of the line that passes through the pair of points (3,8) and (9,5)? Options 2 2 1/2 1/2 2.Write an equation in pointslope form for the line Through the given point with the given slope. (8,3);m=5 Options Y+3=5(x8) Y+3=5x8 Y3=5(x8) Y3=5(x+5) I think ... 
math
23 
Linear Algebra
Let L be the line with parametric equations x = 2+3t y = 3?2t z = 2+t Find the shortest distance d from the point P0=(?5, 1, ?4) to L, and the point Q on L that is closest to P0. Use the square root symbol '?' where needed to give an exact value for your answer. d = _ ... 
Physics
Are you saying that I was doing it right, then? I did (4*10^5)V/303 = 3*10^5(0.45*10^4)/313 1320.13V = 0.043 V = 0.00003267177507 m^3 
Physics
A gas is kept at a pressure of 4.00 × 105 Pa and a temperature of 30.0 °C. When the pressure is reduced to 3.00 × 105 Pa and the temperature raised to 40.0 °C, the volume is measured to be 0.45 × 10^?4 m^3. Estimate the original volume of the gas. I ... 
Physics
Thank you! I realized my problem was that I didn't convert g/cm^3 to g/m^3 correctly 
Physics
The density of copper is 8.96 g cm^?3 and its molar mass is 64 g mol^?1. The mass of an atom of copper is 1.1*10^22 g Determine the number of copper atoms per cubic metre. 
Math
Pradip and pam each have apple slices and orange slices. The ratio of apple slices to the total number of slices is 4 to 11. The ratio of the total number of slices to orange slices on Pam's plate is 13:6. Neither person has more than 20 total slices. Who has more slices? ... 
Science
force of gravity proportional to distance squared so... 
Linear Algebra
Given the following matrices A and B, find an invertible matrix U such that UA = B: A and B are 4x4 matrix and i have to find U. I was wondering how i would do this ie. the steps. if you could be as detailed as possible that would help me. I wanted to try and do it myself ... 
Physics
A train slows down as it rounds a sharp horizontal turn, going from 86.0 km/h to 44.0 km/h in the 13.0 s that it takes to round the bend. The radius of the curve is 140 m. Compute the acceleration at the moment the train speed reaches 44.0 km/h. Assume the train continues to ... 
Las Vegas Cheat BANNED!
👍 
Linear Algebra
Given the following vector X, find a nonzero square matrix A such that AX=0: X=[2 5 3]^T Im not sure how i would find the sqare matrix a? 
Language
Metufor 
Calculus
Use the given graph of f to find a number ? such that if 0 < x ? 3 < ? then f(x) ? 2 < 0.5. since i cannot put up the graph ill put the coordinates (2.6,1.5) (3,2) (3.8,2.5) Please help im not sure how to solve this 
Physics/Math
Prove cos^2 ? + cos?^2 ? + cos^2 ? = 1 . Thank You 
Physics
I m doing an assignment and this is what is asks: (c) Find the sum of the squares of the cosines of the corresponding coordinate direction angles found above. (Measure the cosines of the corresponding coordinate direction angles from the xy plane.) Im not quite sure what it ... 
chemistry
Well Mg is in the second column on the periodic table mean it would have a +2 charge. 
History
How did John Calhoun react to the Tariff of 1828? A. He used his power as Vice President to influence President Jackson to oppose the tariff. B. He led a charge to impose sticker regulations on the second bank of the United States. C. He devised a force bill allowing the ... 
science
A coach tells his little league players that hitting a 0.275 batting average, within 7% percentage error, means that they had a really great season. Seven year old Tommy ended the season hitting a 0.258 batting average. According to his coach, did he have a great season? 
Math
A rectangular garden plot 16 by 24 meters is to be bordered by a strip of uniform width x meter so as to double the area. Find x. 
Math
*supposed I mean 
Math
I dont know either. The problem was given by our teacher. And yes, it is supposes to be y subscript p. Thank you. 
HVAC
Two HVAC/R technicians are discussing the tape used in HVAC/R repairs. Technician A says that cloth duct tape is preferred for use in attics. Technician B says that UL 181 tape is normally required for duct closing systems. Which one of the following statements is correct? 
Math
Thanks! Neede that 
Math
Simpilfy the radical expression by rationalzing the denoiminator? 3/sqrt15 a)sqrt45/15 b)sqrt15/5 c)5sqrt15*** d)sqrt3 
Math
So am I right or wrong I suck at this 
Math
My secon guess was C 
Math
What are the solutions of the system? y=x^2+3x4 y=2x+2 a) (3,6) and (2,4)** b) (3,4) and (2,6) c) (3,4) and (2,2) d) no solutions 
Science (soon if so)
Thank's Student12! 
Science (soon if so)
Over the years technology has gotten a) smaller**** b) heavier c) less complicated d) more expensive What is nanotechnology? a) Nanotechnology is engineering new elements by changing their atoms***** b)Nanotechnology is a way to lengthen radio waves and improve cell phone ... 
Pre Algebra
If you were to roll a fair number cube 120 times, how many times would you expect to roll a 4 based on theoretical probability 
geography
Explain the effects of the poor service delivery. There must evidence that i actually investigate the poor service delivery physically where possible. Explanation must be with regard to social or Economic or Environmental problem 
Microbes and society
In Chapter 9 of the Bible, in the book of Exodus, the sixth plague of Egypt is described in this way: “Then the Lord said to Moses and Aaron, ‘Take double handful soot from a furnace, and in the presence of Pharaoh, let Moses scatter it toward the sky. It will then ... 
Math (Help please!)
c,d,c,d,a graph, equations, inequalities 
Algebra
Check my answer Solve the system of equations algebraically. Show all of your steps. Y=x^2+2x Y=3x+20 My answer: X^2+2x+3x+20 X^2x20 (x5),(x+4)=0 x=5, x=4 y=35, y=8 Thank you! 
Maths
the angles of of evolution of the top of a hill from the City centres of two towns on either side of the hill are observed to be 30Â° and 60Â° respectively. if the distance of hill of the top from the city centre of first is 9 kilometre find in kilometres ... 
Physics
A 5g bullet is fired horizontally and hits an 8kg block of wood (initially at rest) which can move freely. The wood and the bullet move with a velocity of 0.50 m/s after impact. What is the initial velocity of the bullet? 
Physics
A 5 gram bullet is fired horizontally and hits an 8 kilogram block of wood (initially at rest) which can move freely. The wood and the bullet move with a velocity of 0.50 m/s after impact. What is the initial velocity of the bullet? 
Math
The pitch of a screw is the distance between its threads. With each complete rotation, the screw goes in or out a distance equal to its pitch. If the pitch of a screw is 1/17 inch, how far will it go into a piece of oak when it is turned 14 complete rotations clockwise? 
Math
If a recipe calls for 4 eggs for 8 people how many eggs would it be for 32 people 
Math
270 
4th grade math
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Calculusderivatives
At what points on the graph of f(x)=6x^2+4x9 is the slope of the tangent line 2? 
Chemistry
1.38 mol HCl and 2.9 mol NaOH react accord ing to the equation HCl + NaOH ?? NaCl + H2O . If the limiting reactant is HCl, determine the amount of excess reactant that remains. Answer in units of mol. 
Chemistry
1.38 mol HCl and 2.9 mol NaOH react accord ing to the equation HCl + NaOH ?? NaCl + H2O . If the limiting reactant is HCl, determine the amount of excess reactant that remains. Answer in units of mol. 
Math
My numerator is 2 less than my denominator I am more than 1/2 what fraction can i be? 
calculus
define f(x)={x+a if x>2 {1 if x=2 {ax+b if x<2. How to determine the values of a and b for which f(x) is continuous in the set of real numbers. 
math geometry
Find the area of the triangle defined by the coordinates (3, 4), (7, 0), and (3, 4). 
science
Numerical problem : The dimensions of a certain water tank are 8m x 6m x 4m. What is the pressure at the bottom of the tank, if the tank is half filled? 
Math
If the coefficient of sliding friction for steel on ice is 0.05, what force is required to keep a man weighing 150 lbs moving at constant speed along ice? 
Dynamics
A level fight bomber flying at 300 ft/s releases a bomb at an elevation of 6400 ft. Approximately how long before the bomb strikes the earth? 
Dynamics of rigid bodies
a stone is thrown upward with a velocity of 40m/s.Determine the time of the stone when it is at a height of 10m and is moving downwards. 
Chemistry AP
How many mL of0.4M AgNO3 solution must be added to 200mL of0.4 M NaI in order to for 11.7 grams of AgI precipitate? 
Science
A lead calorimeter with mass of 150g contains 200g of water. The calorimeter and water are in thermal equilibrium at a specific temperature. Two metallic blocks are placed into the water. One is a 50.0g piece of aluminum heated at 90 degrees celcius. The other has a mass of ... 
math
Put the following decimals and fractions in order from greastest to least: 0.15, 2/3, 3/5, 0.25, 1 1/8 
Analytical chemistry
Calculate the expected concentrations of vitamin B6 and caffeine in the stock solution assuming exactly 0.0506 g of pyridoxine hydrochloride (vitamin B6) and 0.1253 g of caffeine are dissolved in a 100 mL volumetric flask. 
English
One of the individuals in the selection I chose is Laetitia. She moved away from home to be with her boyfriend. Moving to anew place can make you feel sad and sometimes angry. But Laetitia is with the one she loves and that made up for feeling different in a different place. 
Mathematics
This wasn't there before Sorry But I have a test and I urgently need help 
Mathematics
The area of one of the faces of the cube below is x^2+2x+1 cm^2. Find an expression in mixed radical form for the length of the interior design. plzzzzzzzzzzzzz helppppppppp on thisssss. On my previous question I even showed my work 
Math
The area of one of the faces of the cube below is x^2+2x+1 cm^2. Find an expression in mixed radical form for the length of the interior design. Since no one looked at my previous work.................