Monday

October 24, 2016
Total # Posts: 101,294

**Mechanical Vibration**

nice ka jid. hahahaha

*August 13, 2016*

**Maths**

The graph of a quadratic is a parabola. A parabola has a max or min at the vertex. If the coefficient of x^2 is + it has a min (holds water), Otherwise a max. so find the vertex if y = ax^2 +bx +c then to find zeros you do x = [ -b +/- sqrt(b^2-2ac) ]/2a symmetry (center of ...

*August 12, 2016*

**car rental agency**

company a- $30/day 22cents/mile company b- $28/day 26 cents/mile For a 2-day rental, at what number of mile will the two companies charge the same. Steps please

*August 12, 2016*

**Algebra 1**

THINK square root of 2 (about 1.414213562) can NOT be expressed as a ratio of two whole numbers square root of ten can NOT be expressed as ratio of two whole numbers THEREFORE square root of two * square root of ten which is square root of twenty can NOT be expressed as the ...

*August 12, 2016*

**Algebra 1**

To which subset(s) does the number –square root of twenty belong? Choose all that apply. (Irrational Numbers (Rational Numbers*** (Integers*** (Whole Numbers (Natural Numbers The maximum of choices is 2

*August 12, 2016*

**Math**

Suppose you had 10 beads and sold 6. How many are left? If you can do that, do this one the same way.

*August 12, 2016*

**Math**

Abdul had 720 beads.He sold 648 of them. How many beads does he have left?

*August 12, 2016*

**Maths**

you want to try that again as text, and not URL?

*August 12, 2016*

**maths**

after n seconds, he has climbed 3n cm. After 19 seconds he has climbed 57cm On the 20th second he's at the top.

*August 12, 2016*

**Maths**

∫√tan x sec2x dx If that is sec^2(x), then if you let u = tanx du = sec^2x dx and you have ∫√u du

*August 12, 2016*

**math**

204

*August 12, 2016*

**math**

Starting with x, 2x/5 = b 1/6 (3/5 x) = u b = u+105 Now just solve for x by substituting in the values of b and u

*August 12, 2016*

**maths**

540 * 1.10

*August 12, 2016*

**maths**

goods costing ₹540 are sold at a gain of 10% . Find the SP

*August 12, 2016*

**Matg**

I have a case of 12x16 case of brownies how many square peices can I get in 2"

*August 11, 2016*

**ART**

Thank u

*August 11, 2016*

**physics **

a car moving with a speed of 50 km/hr can be spotted by breaks after at least 6m.If the same car is moving with a speed of 100km/hr the minimum stopping distance is? With solution

*August 11, 2016*

**physics **

a car moving with a speed of 50 km/hr can be spotted by breaks after at least 6m.If the same car is moving with a speed of 100km/hr the minimum stopping distance is?

*August 11, 2016*

**prealgebra**

(12/3.5)1.25

*August 11, 2016*

**NCC**

v = a t = 20 m/s

*August 11, 2016*

**Math**

so 1 man mows 4 greens in 160 min 1 man moves one green in 40 min You did not say how many greens to mow in an hour so I can not continue, but you should be able to figure it out now that you have the data for one man

*August 11, 2016*

**typos**

makes no sense

*August 11, 2016*

**Math**

240 people/one day so 240/4 = 60 so 60 - 24

*August 11, 2016*

**physics**

24 relative to you. 12 relative to the mirror surface and the floor etc. It is approaching the mirror surface just as fast as you are.

*August 11, 2016*

**Math**

You do whatever is inside the parentheses first.

*August 11, 2016*

**Math**

180 - 163

*August 11, 2016*

**Maths**

games played = 9+N games won = 2+N 2+N = (1/2)(9+N) 4 + 2 N = 9 + N N = 5

*August 11, 2016*

**Calculus**

Could be :)

*August 11, 2016*

**Calculus**

Find arccos (sqrt2/2). Can this be pi/4 and 7pi/4?

*August 11, 2016*

**Physics**

depends on temperature BUT I suspect that there is liquid chlorine in the bottle. If so then the pressure remains at the vapor pressure of Chlorine until it is evaporated. The N2 is all gas in there until you get down to liquid air temperature so it follows gas laws.

*August 11, 2016*

**Sum of geometric sequences**

5,15,45,135,....S10

*August 10, 2016*

**Math**

LCD 3/4 1/8 7/16 3/32

*August 10, 2016*

**Math**

draw four number lines and mark the spots. remember absolute value of -x is +x eg |-147| = + 147

*August 10, 2016*

**Science**

*scientific inquiry useful - Scientific inquiry refers to the diverse ways in which scientists study the natural world and propose explanations based on the evidence derived from their work.useful in such widely divergent enterprises as science and crime scene detective work...

*August 10, 2016*

**math**

a number is 160 when rounded off to the nearest ten.whta is the smallest possible value of the number?

*August 10, 2016*

**ap chemistry**

Propane gas and oxygen gas will chemically react via combustion. Write a blanced equation for this change and then use stoichiomety problem solving to determine the number of carbon dioxide molecules that can theoretically form.

*August 10, 2016*

**ap chemistry**

Ammonia decompose upon intense heating to produce nitrogen and hydrogen elemental products. Write a balanced equation and then use stoichiometry problem solving to determin the mass of nitrogen product that can form if exactly 25.50g of ammonia is fully decomposed.

*August 10, 2016*

**chemistry**

Ammonia decomposes upon heating to produce nitrogen and hydrogen elemental products. Write a balanced equation and then use stoichiometry problem solving to determin the mass of nitrogen product that can form if exactly 25.50 grams of ammonia(NH3) is fully decomposed.

*August 10, 2016*

**Language Arts**

or A

*August 9, 2016*

**Language Arts**

Would it be D

*August 9, 2016*

**Language Arts**

Identify the climax in the following example. 1.A boy sees a snake lying still in the road. He bends close to look at it. Suddenly, the snake moves. The boy jumps back. A. A boy sees a snake lying in the road. B. The snake is lying still in the road. C. The boy bends down to ...

*August 9, 2016*

**ap chemistry**

use dimensional analysis to find how many moles of nitrate ions are in 40.0 mL of a 0.75 M aqueous solution of aluminum nitrate

*August 9, 2016*

**Science**

Two forces whose magnitude are in the ratio 3 :5 gives resultant of 28. If the angle of their inclination is 60 Â°find the magnitude of each force

*August 9, 2016*

**science**

A spring fixed at one end can be streched by hanging standard masses from the other end. What masses is needed to achieve a stretching force of 5N?

*August 9, 2016*

**Algebra 1**

Thank you

*August 9, 2016*

**Algebra 1**

1. Which is an example of an algebraic expression? A. 4(3+8) B. 18^2 C. 3 - a*** D. 21 x 4 2. Which is an algebraic expression for 5 more than? A. 5z B. z + 5*** C. 5z + 5 D. 5 - z 3. Which word phrase can be used to represent the algebraic expression 4(21 + n)? A. 4 plus the ...

*August 9, 2016*

**Algebra**

The present age of raj and ram is in the ratio 1:3. After 5 yrs rams age wiil be 2yrs more than twice of rajs age . Find their present ages

*August 9, 2016*

**science**

what is the ratio between acceleration and velocity?

*August 9, 2016*

**math**

In the number 8,920,000 the digits in the tens and hundreds places are the least and the same. What are they?

*August 8, 2016*

**Applied Stats**

Based on the data collected by the National Centre for health Statistics and made available to the public in the Sample Adult database, it was found that the percentage of adults who have at some point in their life been told that they have hypertension was 24 percent. Suppose...

*August 8, 2016*

**algebra**

Robert is N years old. Robert's brother is 6 years younger than Robert.

*August 7, 2016*

**West Charlotte **

Rosa has 3 3/4 pounds of dough. She uses 3/4 of a pound for one medium loaf of bread. How many medium loaves of bread could be made from Rosa's dough?

*August 7, 2016*

**unicorn**

they are pink

*August 7, 2016*

**math**

how many different ways can 24 horses win 1st & 2nd places

*August 7, 2016*

**Maths**

c/s = 2/7 so s = 7 c/2 .35 c +.2 s = 180 .35 c + .2 (7 c/2) = 180 .35 c + .7 c = 180 1.05 c = 180 c = 171 kg

*August 7, 2016*

**Maths**

h = r/4 or r = 4 h 3 (h+6) = r+6 3 h + 18 = 4 h + 6 h = 12

*August 7, 2016*

**algebra 2**

Same both sides of mean Your mean is not your median

*August 6, 2016*

**algebra 2**

google David Lane Normal distribution look at picture mean is median

*August 6, 2016*

**algebra 2**

NOT SYMMETRICAL

*August 6, 2016*

**algebra 2**

I believe a normal distribution tends to be symmetrical about the mean which is therefore the median.

*August 6, 2016*

**algebra**

5/4 = 1.25 percent per quarter 5 = 1.0125^n ln 5 = n ln 1.0125 n = 130 quarters = 32.4 years

*August 6, 2016*

**fundamentals of math**

3.5/36 = h/2640

*August 6, 2016*

**fundamentals of math**

By holding a ruler 3 feet in front of her eyes as illustrated in the diagram, Carla sees that the top and bottom points of a vertical cliff face line up with marks separated by 3.5" on the ruler. According to the map, Carla is about a half mile from the cliff. What is the...

*August 6, 2016*

**fundamentals of math**

A point lies on the of a line segment if and only if the point is equidistant from the endpoints of the segment. angle bisector trisector altitude perpendicular bisector

*August 6, 2016*

**Fundamentals of Math**

A tree casts a shadow 36 m long. At the same time, the shadow cast by a 49-centimeter tall statue is 90 cm long. Find the height of the tree. Round to the nearest tenth.

*August 6, 2016*

**maths**

solve this anagram please. its a famous mathematician ghetgninlai

*August 6, 2016*

**maths**

10 c + 26 a = 740 but a = 50 - c so 10 c + 26 (50 - c) = 740 -16 c + 1300 = 740 16 c = 560 c = 35

*August 6, 2016*

**math**

add them and divide result by 6

*August 6, 2016*

**need acceleration or force**

not enough info

*August 6, 2016*

**physics**

Just do the vertical part of the problem. Vi = 20 sin30 = 10/m/s up v = Vi - g t = 10 - 9.81 t so t is about one second upward until v = 0 at the top. then another second falling for a total of two seconds in the air.

*August 6, 2016*

**math help me out**

If there is an easier way I do not know it.

*August 6, 2016*

**math help me out**

raised by (1+x) lowered by (1-x) p - p (1+x)(1-x) = 100 100/p = 1 - [ 1-x^2] 100/p = x^2 or p =100/x^2 then second p = 2304 = [100/x^2](1-x^2) 2304 = 100/x^2 -100 2204 = 100/x^2 22.04 = 1/x^2 x = .213 so 21.3 %

*August 6, 2016*

**MATH**

hypotenuse = 5 base = 8/2 = 4 3,4,5 right triangle so altitude = 3

*August 6, 2016*

**ALGEBRA**

3. A car cost $32 600 in the year 2001. By 2007, it is worth $12 295. By what percent did the car depreciate (decline in value) per year? 32600(1-R)^6=12295 correct? r=?

*August 5, 2016*

**ALGEBRA**

Thanks so much!

*August 5, 2016*

**ALGEBRA**

3 obviously, 64 from now on is better than 49 or 13 1. linear, slope = 2 2. quadratic, 1^2 2^2 3^2 ..... 7^2 3. exponential 2^n

*August 5, 2016*

**ALGEBRA**

You have just landed your first summer job and your boss has told you that you can choose from one of 3 pay structures for the first week (7 days) that you work there. And after the first week, your pay will be frozen at the final rate for the remainder of the summer. #1pay ...

*August 5, 2016*

**math typo**

sorry, did typo with calculator the first time I did problem 2

*August 5, 2016*

**math**

.01/12 + 1 = 1.0008333333 6000 *(1.000833333)^120= 6630.75 ============================= dx/dt= .07 x dx/x = .07 so ln x = .07 t x = k e^.07 t so 2 = e^.07t ln 2 = .07 t t = 9.90 so I agree with you if you round off but I do not know what accuracy you are supposed to have.

*August 5, 2016*

**math**

.01/12 + 1 = 1.0008333333 6000 *(1.000833333)^120= 6630.75 ============================= dx/dt2 = e^.07t ln 2 = .07 t t = 3.35

*August 5, 2016*

**maths**

V = pi r^2 h S = 2 pi r^2 + 2 pi r h = 88 * 10^4 cm^2 so 2 pi (r^2 + 7r) = 88 *10^4 r^2 + 7 r = about 14 *10^4 r is around 400 (do quadratic with calculator)cm almost all of the area is in the top and bottom so V = about 7*44*10^4

*August 5, 2016*

**physics**

draw ray from tip to center of mirror then outward to tip of bigger inverted real image. look at similar triangles 12 * 4 = 48

*August 5, 2016*

**Algebra**

1/2x(2x-4)^2 answer is not 2x(x−2)2

*August 5, 2016*

**Chemistry**

Consider the following reaction between sulfur trioxide and water: SO3(g)+H2O(l)→H2SO4(aq) A chemist allows 61.5 g of SO3 and 11.2 g of H2O to react. When the reaction is finished, the chemist collects 51.0 g of H2SO4. Determine the percent yield for the reaction.

*August 5, 2016*

**ALGEBRA**

You have just landed your first summer job and your boss has told you that you can choose from one of 3 pay structures for the first week (7 days) that you work there. And after the first week, your pay will be frozen at the final rate for the remainder of the summer. Option 1...

*August 5, 2016*

**Algebra**

800 - 6 m = 1000 - 10 m so 4 m = 200

*August 4, 2016*

**physics**

12 mm/s = .012 m/s = Vi initial speed up h = Hi + Vi t - 4.9 t^2 0 = 40 + .012 t - 4.9 t^2 Solve quadratic for t

*August 4, 2016*

**Microsoft exel**

4. You're working in a table that has three columns and five rows. Since the first row will be a header row, you want it to span all three columns. What formatting feature should you use? A. Connect cells B. Autofit cells C. Combine cells D. Merge cells

*August 4, 2016*

**math**

Grandpa says sam can have all the coins in his pocket if he discover the correct total valeu of the coins. What is the total value of the coins in grandpas, pocket that same should discover?show all mathematical thinking.

*August 4, 2016*

**biomechanics**

A golfer’s hands move through an arc length of 10 cm during a putt. What arc length does the head of the putter move through if the hands are 50 cm from the axis of the rotation and the putter head is 150 cm from the axis of rotation?

*August 3, 2016*

**interior **

Which one of the following statements regarding the concept of scale is correct?

*August 3, 2016*

**biomechanics**

A gymnast is performing her routine on the balance beam. She is standing on her left leg and facing forward along the long axis of the beam. Her right leg is flexed 90 degrees at the hip and with the knee extended. Her left arm is fully abducted 180 degrees at the shoulder, ...

*August 3, 2016*

**biomechanics**

The sweet spot on a baseball bat is 120 cm from the axis of rotation during the swing of the bat. (This seems long at first, since the bat is shorter than 120 cm. But the bat’s axis of rotation is outside of the bat and passes through the body of the batter.) If the sweet...

*August 3, 2016*

**math**

g = 300 + 50 t 2050 = 300 + 50 t 50 t = 1750 t = 175/5 = 35 hours

*August 3, 2016*

**Math**

is there any easier way to answer this question?

*August 3, 2016*

**chemistry**

why is helium considered a noble gas?

*August 3, 2016*

**Calculus1**

find the derivative using fundamental theorem of calculus integral of sin^3tdt from e^x to 0

*August 3, 2016*