# Posts by MAry

Total # Posts: 3,831

**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?

**Statistics**

.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?

**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 ...

**ENGLISH**

PLEASE HELP ME TO WRITE A PEOM ABOUT GIVERS NEVER LACK

**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 ...

**Language Arts (Check My Answers**

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 ...

**Social Studies (check my answers)**

Would number 2 be A?

**Social Studies (check my answers)**

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!

**Social Studies (check my answers)**

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**

My answer is A

**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

**math**

3:55 +25 minutes =4:20

**algebra**

I still don't get is I knopw max of parabola is -b/2a but this isn't quadratic

**algebra**

a candy company has 130 pounds of cashews and 170 pounds of peanuts which they combine into different mixes the deluxe has half cashews and half peanuts and sells for $7 a pound the economy mix has one third cashews and two thirds peanuts and sells for 5.40 a pound how many ...

**math**

(32*7.50)*4=960 1 week of pay times 4 weeks

**college algebra**

a candy company has 130 pounds of cashews and 170 pounds of peanuts which they combine into different mixes good luck stats has half cash and half peanuts and sells for $7 a pound become a mix has one third cashews and two thirds peanuts and sells for 5.40 a pound how many ...

**chemistry**

Which conducts better, BeCl MgCl2

**Math**

I need help please. 89°F= ___C

**math**

what number am I? My ten-thousands digit is 4 less than my thousands digit. My thousands digit is 3 times my hundreds digit. My hundreds digit is 1/2 tens digit. My tens digit is 6. My ones digit is 3 more than my tens digit.

**Math**

What is the mystery number sentence? Its factors are divisible by 3. Its factors are divisible by 10. Its product is greater than 2500. Its product is less than 3000.

**math**

A cylindrical tank with diameter 20in. is half filled with water. How much will the water level rise if a metallic ball of radius 4 in. is placed in the tank?

**AP**

. Plant -+ Deer --+ Tiger The first step in the energy chain that created the bonds of proteins in the tiger's muscle cells in the food chain shown above is the A. deer the tiger ate. B. plant the deer ate. C. photons the sun made. D. carbohydrates the plant made. I am ...

**Chemistry**

A 50 g piece metal is placed in 250 g of methanol at 0 °C. The methanol is warmed to a temperature of 5 °C. What is the specific heat of the metal?

**MATH**

You all need to chill out just because somebody forgot to put the answers it doesn't mean u get to freak out

**Math**

The tile store has three different brown tiles mr Jacobs can use. The tile prices are shown in the table. Which tile can he purchase to stay in his budget and meet the design for 38 tiles? His budget is $1200.00

**Calculus**

Find the volume of the solid generated by rotating the region 0<y<5-x^2 about the x-axis

**Chem 1410**

How many moles of methane occupy a volume of 3.00 L at 55.0 degrees C and 0.600 atm? (R=o.o821 atm*L/mol*K)

**maths**

A train driver moving at 40km|h applies break so that there is a constant retardation of 0.5m|s find time taken before the train stops

**science**

Thx so much messi

**Spanish**

The question: ¿Qué obras de arte o de literatura influyen en tu vida? Your answer: Una obra de literatura que influye en mi vida es To Kill a Mockingbird. The question is actually asking: What works or art or literature influence your life? The question is not ...

**accounting**

An employee earns $20 per hour and 1.75 times that rate for all hours in excess of 40 hours per week. Assume that the employee worked 55 hours during the week, and that the gross pay prior to the current week totaled $29,000. Assume further that the social security tax rate ...

**Art**

No Name is completely right

**maths**

Data were collected on the differences in weight gains of 12 people one month after they stopped smoking, compared with their weight at the time when they stopped smoking. The data are given in Table 2. A positive quantity corresponds to a gain in weight, a negative quantity ...

**Spanish**

Estos calcetines translates to "these socks". It's most likely that you are talking about the socks in your hand because they are closest to you.

**Math problems**

On her math test, Terry got 52 questions correct out of 68. What percent of the test questions did Marie answer correctly?

**PHYSICS**

no this is the correct answer : N = ma= mg- mv²/R= 1800•9.8-1800•9.24²/18.4 =9287.84 N

**PHYSICS**

Suppose a 1800-kg car passes over a bump in a roadway that follows the arc of a circle of radius 18.4 m as in the figure shown below. (a) What force does the road exert on the car as the car passes the highest point of the bump if the car travels at 9.24 m/s? (Neglect any ...

**physics**

Suppose a 1800-kg car passes over a bump in a roadway that follows the arc of a circle of radius 18.4 m as in the figure shown below. (a) What force does the road exert on the car as the car passes the highest point of the bump if the car travels at 9.24 m/s? (Neglect any ...

**physics**

Question Part Submissions Used A 3.25-kg object is attached to a vertical rod by two strings as shown in the figure below. The object rotates in a horizontal circle at constant speed 6.60 m/s. (a) Find the tension in the upper string. N (b) Find the tension in the lower ...

**math**

sandra brings cheese and crakers for lunch every 6 days, and lily brings cheese and crakers every 8 days. if they both brought cheese and crakers today, how many days will it be before both girls bring cheese and crakers again