# Posts by MAry

Total # Posts: 3,870

Chemistry
What mass of hydrogen gas is produced when 3.0 mol of iron react with excess hydrochloric acid according to the reaction below 2Fe + 6HCl --> 2FeCl3 + 3H2

Chemistry
What mass of hydrogen gas is produced when 3.0 mol of iron react with excess hydrochloric acid according to the reaction below 2Fe + 6HCl --> 2FeCl3 + 3H2

Chemistry
What mass of hydrogen gas is produced when 3.0 mol of iron react with excess hydrochloric acid according to the reaction below 2Fe + 6HCl --> 2FeCl3 + 3H2

Math
11. Un panadero compró un poco de harina. Usó 2/5 de la harina para hacer pan y usó el resto para hacer lotes de muffins. Si usó 16 lb. de harina para hacer pan y 2/3 lb. para cada lote de muffins, ¿cuántos lotes de muffins hizo?

physics
A can of Coke moving 15.6 m/s toward the right(the positive direction) collides with a can of Pepsi moving 3.21 m/s toward the left, and both cans are badly crunched. If the final velocity of the can of Coke is 2.48 m/s still toward the right, then what is the final velocity ...

SS
how did Alexander Hamilton plan to pay off the national debt? by creating a population tax by printing new currency by taxing imports** by increasing exports

Statistics
Please help me with this homework you roll two fair dice, a green one and a red one? (a) are the outcomes on the dice independent? (b)Find P(1 on green die and 2 on red die) (c)Find P(2 on green die and 1 on red die) (d)Find P(1 on green die and 2 on red die) or (2 on green ...

physics
The answer is #4. I had that same question and got it right.

Physics
Several forces are applied to an object. If the object 40 m along the horizontal, and if one of the forces is a constant 5.0 N in the opposite direction, then what is the worst done on the object by that force?

Ela
Can you help me with the final check:Relating to Parents chapter 17

calc
How do I find the inverse of a picewise function???

Math
The diameters of a circle is 50cm how far does the wheel travel for 1 turn

Physics
You toss a tennis ball straight upward. At the moment it leaves your hand it is at a height of 1.3 m above the ground, and it is moving at a speed of 7.4 m/s. (a) How much time does it take for the tennis ball to reach its maximum height? (b) What is the maximum height above ...

Statistics
Write an inequality that represents all of the data values X, that fall between the values of the mean +/- the standard deviation

college algerbra
Describe how you know if an inequality is an “and” or an “or” problem. (use -3 < x+5 < 8).

pre-calc
e^-1 cost +sint(-e^-t)=0

pre-calc
Solve for t if 0<t<2pi Note: both are less than or equal to . Please help!! I am not sure what I should do.

physics
Two objects are positioned and moving . m 1 = 7 kg ,m 2 =11 kg, and the coefficient of kinetic friction between object 1 and the tabletop is uk = 0.14. Find the acceleration of object 2(assuming up is the positive direction) as well as the tension in the string.

Chemistry
These were all correct 100%

Chemistry
What do you mean "ok"? Are they correct?

Chemistry
1) How does the atomic radius change from left to right across a period in the periodic table? A) It tends to decrease*** B)It tends to increase C) It first increases, then decreases D) It first decreases, then increases 2) What is the charge of a cation? A) A positive charge...

Math
How many square tiles with sides 1 foot long would be needed to cover the floor of an 8' x 10' room

Engineering

Engineering
If the cost of a .75 x 6.o x 19.0 sheet of ABS plastic is \$18.00, what is the cost to make 20 parts? each part has a mass of .437lb.

Engineering
.437 lbs

Engineering
Damon the mass is .437 per part. It should be a simple problem for me but I am not sure right now. Thanks for your help.

Engineering
If the cost of a .75 x 6.0 x 19.0 sheet of ABS plastic is \$18.00, what is the cost to make 20 parts?

Chemistry
1) How does the atomic radius change from left to right across a period in the periodic table? A) It tends to decrease*** B)It tends to increase C) It first increases, then decreases D) It first decreases, then increases 2) What is the charge of a cation? A) A positive charge...

Science/Math
You put 50 mL of water in a graduated cylinder, then you place an object in the water. The level rises to 55 mL. What is the volume of the object?

Physics
A projectile is launched horizontally from a cliff and has initial speed 30 m/s. The projectile will hit the ground 10 s later. What is the horizontal component of the projectile's velocity 5.0 s after launch. Assume air resistance is negligible.

Physics
A man chased by the army, leaps with speed 12 m/s at a 47 degree angle above the horizontal from the top of a building. If he lands 40.0 m from the base of the building, then finds the height of the building

Math
eat this hw t

math
Before 1986, a gold bullion in the Federal Reserve Bank was rectangular and had a volume of approximately 727.7 cm3. The density of gold is 19.3 g/cm3. A pound is approximately 454 g. Find the weight of one gold bullion to the nearest tenth of a pound

Chemistry
#3 was wrong.

Chemistry
1) The letter "p" in the symbol 4p^3 indicates the ___. A) spin of an electron B) orbital shape*** C) principal energy level D) speed of an electron 2) If the spin of one electron in an orbital is clockwise, what is the spin of the other electron in that orbital? A) ...

French
I have a Windows PC and thank you!

French
Thank you

French
Check answers? 1) Write a comparative sentence: La tortue est intelligente mais le poisson est tres intelligent. A) La tortue est moins intelligente que le poisson.*** B) La tortue est aussi intelligente que le poisson. C) La tortue est plus intelligente que le poisson. 2) ...

Math
Byong Sun withdraws \$15 from his bank account once each day for four days. what integer represents the change in the amount in the account? find the integer that would represent the change in the amount in the account if Byong Su deposits \$15 into his bank account once each ...

American Government
Check answers? 1) What is the main difference between the formal and informal qualifications for the House of Representatives? A) Formal qualifications are outlined in the Constitution**** B) Formal qualifications do not have to be followed C) Informal qualifications deal with...

Precalculus
For this problem, we will use the formula for position of an object. y=1/2at^2+vot+ho, where t is time in seconds, a is acceleration in meters per second squared (in this case gravity so -9.8 m/s2), v0 is the initial velocity in meters per second, and h0 is the initial height ...

Geometry
1) What are the converse, inverse, and contrapositive of the statement? Which statements are true? If the figure is a rectangle with sides 2 cm and 3 cm, then it has a perimeter of 10cm. My A: the statement is not true. 2) What are the hypothesis and the conclusion of the ...

MS. SUE HELP- Chemistry
Check answers? 1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements? A) Cathode rays are negatively charged particles**** B) Cathode rays can be deflected by magnets C) An electron is 2000 times lighter than a hydrogen atom D) Charge-to-...

Chemistry
Check answers? 1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements? A) Cathode rays are negatively charged particles**** B) Cathode rays can be deflected by magnets C) An electron is 2000 times lighter than a hydrogen atom D) Charge-to-...

Physics
A cute puppy walks 20 m at 30 degrees north of east and then continues another 45 m at 15 degrees south of east. Find the magnitude of the puppy's net displacement (or the distance from the starting point)

physics
If a vector K has component Kx = 4.1 and Ky = -13, then find the magnitude K and direction (as a positive rotation angle relative to the +x axis) of the vector.

Math
How many complete sets of aprons could you make out of 5 1/2 bolts of material and 1 bolt is equal to 15 yards? there are adult size which needs 3/4 yard material to make and child size which takes 1/2 yard to make.

Physics
A net force is applied to an object, the same net force is then applied to a second object with 6.2 times the mass of the first then the acceleration of the second object will be how many times the acceleration of the first object?

Physics
If a 350 kg object is moving with constant velocity 22 m/s due east then what is the magnitude of the net force acting on the object?

Physics
A taxicab moves 5 blocks due north, 5 blocks due east, and another 2 blocks due north. Assume all blocks are of equal size. What is the magnitude of the taxi's displacement?

Physics
A science student is riding on a flatcar of a train along a strait, horizontal track at a constant speed of 12.0 m/s. The student throws a ball into the air along a path he judges to make an initial angle 65. deg with the horizontal and to be in line with the track. The ...

HCC
A motorcycle is following a car that is traveling at constant speed on a straight highway. Initially, the car and the motorcycle are both traveling at the same speed of 19.5 m/s , and the distance between them is 57.0 m . After t1 = 4.00 s , the motorcycle starts to accelerate...

Algebra
A coaxial cable 10 feet long is cut into two pieces such that the length of one piece is two-thirds of the length of the other piece. Find the length of the shorter piece of cable.

Math
Solve the inequality: 1/4w +3 is less than -6

Chemistry
What is the volume of the oxygen produced when 1.00L carbon dioxide reacts with 20.0 g of Na2O2 based on the following unbalanced reaction at 25C and 2.00 bar? Na2O2 + CO2 -> O2 + Na2CO3 R = 0.083145 L bar K-1 mol-1 I got 1.57L but the answer is 500mL

economics
This chart shows the components of nominal GDP for the years 2000 and 2001. All figures are in billions of current dollars. Components 2000 2001 Consumption \$6,684 \$6,987 Investment \$1,755 \$1,560 Government Spending \$1,751 \$1,858 Exports \$1,101 \$1,034 Imports \$1,467 \$1,383 ...

Math
Emma estimated the first digit in the quotient of 2,183 ÷ 42 as 4. She adjusted the quotient. What did zhe do wrong? Explain

Algebra
The difference of two numbers is 47. The larger number is three less than six times the smaller number. Find the numbers.

Linear Algebra
Please , I don´t know how to do this demonstration: If A and B are mutually perpendicular vectors( different to zero vector) and "c" is any number show that : || A +cB ||>= ||A||

math
I would say around 5 or 6

Calculus
Hello I need help with this excersise of derivative of a inverse function. The excersise says: If f(x+2)=x^3+1 and g(x)=f(arctg x), find the derivative of the inverse function of g(x) and then calculate (g^-1 (9))'[the derivative of the inverse function evaluated in 9] . I...

math
half the difference of 4 from 14 added to 5

math
A hare is in a 100m race. it starts the race at a particular speed s. halfway through the race, it notices its losing, and increases its speed by an additional 15m/s. Write a formula for how long the hare took on the first half of the race, in terms of s.

mac1105
A driver averaged 43-miles per hour and took 6 hours to travel between two cities? What is the distance between the two​ cities?

Calculus
Well I cannot use L´Hopital´s Rule. :c

Calculus
Hello, I need help with this limit: Lim ((arctanx-x)/x^3) X->0 I can't use L'Hospital Rule or series. I don't get what to do. Can you give an idea?

Math
Sam ranks movies on a scale of 1-100. If he adds 2 points to each movie in his collection, and the range of the ranking was 54, what is the range when the 2 points are added ?

Math
If P^2+q^2 = 25 and 2 pq=10. What is the value of (p-q) ^2?

Calculus
I really need help. Create an appropriate table of values for the function f(x)=tan3x/7x and use the reslut to estimate lim as x approaches 0 tan3x/7x

Chemistry
Hello I need help with this excersise: How many moles of NH4Cl are neccesary to add to 1 liter of solution of Co2+ 0,20 M in order to prevent the precipitation when the solution is saturated with H2S (0,1M) and the pH is 7,50. It 's known that pKbNH3=4,75 ; Kps(CoS)=2,0&...

CHEMISTRY
CALCULATE THE DECREASE IN TEMPERATURE FOR 22.0 G SILVER THAT LOSES 625 J

science
Nebular Theory

Math
Blake watched 1/6 of a movie on Friday,3/5 of amovie on saturday, and the rest on sunday. What fraction of the movie did he watch on Sunday?

Algebra2
Is it y=6x?

Science
What science field is Vantablack considered to be part of?

Math
6

statistics
A manufacturer has a maximum of 240, 360, and 180 kilograms of wood, plastic and steel available. The company produces two products, A and B. Each unit of A requires 1, 3 and 2 kilograms of wood, plastic and steel respectively; each unit of B requires 3, 4 and 1 kilograms of ...

Social studies
if a savings account can suddenly buy much more than before does that mean deflation is occuring?

counseling
D: All of the above

Algebra
An aeroplain flies at a constant altittude of 4000 flies above sea level.at it start to land it descend at a constant rate at X rate per mins .at what altittude is the plane Ymins after it begins to descend

penn foster child care
A pre schooler should drink ____________ ounces of milk each day

pre algebra
A flower bed is in the shape of a triangle with one side twice the length of the shortest​ side, and the third side is 30 feet more than the length of the shortest side. Find the dimensions if the perimeter is 138 feet

Math- Assignment Due
Please help me, it would be greatly appreciated. 1.) A set of data was collected as shown in the table. Data value: Frequency: 5. 9 6. 9 7. 14 8. 9 9. 13 10. 7 11. 9 The standard deviation of the data is A..) 1.90 B.) 2.00 C.) 2.33 D.) 7.93 2.) A group of apples from a ...

Financial math
janet won lottery an receives \$10 the 1st year. in the following years, she receives \$50 more each year, (that is, janet receives \$150 the second year, \$200 the third, and so on) How much will she receive in total after 10 years

ENGLISH

computer studiea
: 88% 100% 100% 100% 16% what is overall percentage

Biology
Uable to find correct answer: In general it is expected_____________ A) hydrostatic pressure will remain constant throughout the capillary bed B) osmotic pressure will be higher in the arteriole end of the capillary bed compared to the venous end C) osmotic pressure will be ...

English
Change passive voice into active

Anatomy
I have the formula to problem but can not come up with any of the answers. Problem: Calculate the cardiac output if heart rate (HR) is 90 beats per minute, stroke volume (SV) is 110 ml/beat, end diastolic volume (EDV) is 140 ml, and end systolic volume (ESV) is 30 ml. select ...

13. Complete the sentence with the word that has the most positive connotation. She was wrong and too_____ to admit it. ￼￼￼￼￼￼￼￼￼￼￼￼bullheaded headstrong hardheaded determined**** 14. What is ...

Would number 2 be A?

Ok i just checked them out, thank you. But can you still check my answers for 8,9, and 10. In the questions below those were unclear. It would also be great if you could check all of them so that I can get your opinion rather than just Mrs. Sue's. Thanks!

1. Mexico's economy is based largely on (2 points) oil exports. mining. agriculture and livestock.** industry. 2. Many indigenous people in Guatemala live in the mountains because (2 points) it is the only land available to them. the soil is very good for farming. they don...

LA

LA
8. Whose attitude toward Scrooge is the most severe? (1 point) Marley's Bob Cratchit's the Ghost of Christmas Present's Mrs. Cratchit's

Math
I have 2 similar triangles. The surface area of the smaller one is 27m squared. The scale factor is 3. How do I find the surface area of the larger triangle

math
angle PQR and angle TQV are vertical angles. The measure of the two angles have a sum of 100*. Write and solve an equation to find x, the measure of angle TQV.

Calculus
Consider the region in the plane consisting of points (x, y) satisfying x > 0, y > 0, and lying between the curves y=x^2 +1and y=2x^2 −2. (b) Calculate the area of this region.

math
If the angles of a quadrilateral are x,x+10,x+20 and x+30 degrees find the value of each