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Helen

Questions and answers by visitors named Helen

Questions (401)

If set M consists of all integer numbers x such that 3<x<7, and set N consists of all integer numbers x such that 6≤x≤9,
1. 5 answers
2. 1,605 views
It takes a boat going upstream 3 hours to cover the same distance, as it would cover in 2 hours going downstream. What is the
1. 7 answers
2. asked by Helen
3. 6,314 views
How many 4-digit numbers are neither multiples of 2 nor multiples of 5?
1. 5 answers
2. 3,606 views
An initial population of 298 quail increases at an annual rate of 8%. Write an exponential function to model the quail
1. 4 answers
2. 6,780 views
How many 2-digit numbers are multiples of 2 but not 4?
1. 7 answers
2. 2,352 views
For what natural values of n:is the sum (−27.1+3n)+(7.1+5n) negative?
1. 4 answers
2. 1,573 views
Words to choose from: Commemorate, complacent, consensus, deplete, diligent, empathy, menial, niche, transcend, and waiveAt
1. 12 answers
2. 7,608 views
A man 1.5m tall is 15m away from a tower 20m high.What is the angle of elevation of the top of the tower from his eyes?
1. 6 answers
2. 2,476 views
There are two ways of scoring points in a ball game: a ‘major’ scores 5 points and a ‘minor’scores 3 points. In a match
1. 5 answers
2. 2,261 views
An airplane is pressurized to 650mm Hg, which is the atmospheric pressure at a ski resort at 13,000ft altitude.a. if air is 21%
1. 4 answers
2. 7,160 views
Without building the graph, find the coordinates of the points of intersection of the graph of the equation (x+2)(y+3)=0 with
1. 4 answers
2. 1,250 views
If 10.6 mol of carbon monoxide is produced how many grams of carbon were used?How do you convert moles to grams? And what are
1. 3 answers
2. 1,048 views
an empty rubber balloon has mass 0.0120kg, the balloon is filled with helium of density 0.181 kg/m^3. the balloon is spherical
1. 5 answers
2. asked by Helen
3. 3,062 views
His first fight was for his health and vigor. It all began at the age of nine. As a child, he was weak and thin because of his
1. 7 answers
2. 845 views
Write the expression as a cube of a monomial.– 8/27a^15
1. 4 answers
2. 1,536 views
Fill in the missing parts:(5x + ___)^2 = ___ · x^2+70xy + ___
1. 4 answers
2. 2,037 views
Students perform an experiment using a circuit that contains the two parallel plate capacitors C1=10μF and C2=40μF. Come up
1. 5 answers
2. 2,585 views
A store sells packages of 48 Snickers bars for $28 per package, and packages of 36 KitKat bars for $22.50 per package. Mrs.
1. 7 answers
2. 3,173 views
The diagram below shows the method of construction of a book with four folded sheets in eachblock, and three blocks in total.
1. 4 answers
2. 2,168 views
How do you know whether a system of equations has no solution, one solution, ormany solutions?How can you identify whether a
1. 2 answers
2. 599 views
x^2+x=12Since you do not ask a specific question, I assume that you want to find the factors. x^2 + x - 12 = 0 From the above,
1. 1 answer
2. 328 views
What are the Lewis structures for hydrogen cyanide and cyanogen??I think it's H:C:::N :N:::C:C:::N: with the inner upper
1. 1 answer
2. 617 views
Rank these in order of increasing freezing points:C2H6O, NaCl, NaSO4, C12H22O11 I suggest that you look them up. You will have
1. 1 answer
2. 581 views
predication1. The reason for the cat's illness is because she was allergic to the dog. 2. The driving exam is when one is tested
1. 2 answers
2. 576 views
Suppose the amount of heat removed when 3.0kg of water freezes at 0 degree C were removed from ethyl alcohol and its
1. 6 answers
2. 3,399 views
Suppose the amplitude and frequency of a transverse wave are, respectively, 1.3cm and 5.0Hz. Find the total vertical distance
1. 4 answers
2. 1,102 views
How would I calculate exponential regression?
1. 1 answer
2. 442 views
n=15 and there are 3 groupsThese data are analyzed by an ANOVA, and the resutls are reported in the following summary table.
1. 3 answers
2. 548 views
similarities between and oxidative phosphorylation and photophosphorylation
1. 1 answer
2. 404 views
Can someone provide me the help to explain this statement:"An important step in the history of life on Earth was the evolution
1. 1 answer
2. 312 views
last question about bioExplain the statement below: “ Biological evolution began when cells formed”
1. 1 answer
2. 943 views
How to build tetrachords for the following staffs: G, F, A, E, C#,
1. 1 answer
2. 369 views
At 1200 K, the approximate temperature of vehicle exhaust gases, Kp for the reaction<- 2CO2(g) -> 2CO(g) + O2(g) is about
1. 1 answer
2. 496 views
At 1200 K, the approximate temperature of vehicle exhaust gases, Kp for the reaction 2CO2(g)⇄2CO(g) + O2(g)is about 1*E-13.
1. 2 answers
2. 560 views
Under what circumstances do you need to perform dilution(s)?
1. 1 answer
2. 318 views
I Need help with the following question:If moe has 3x as many singles as larry, and Larry has 4X as many doubles as curly. How
1. 3 answers
2. 479 views
A vehicle starts w/ a full tank of gasoline and travels 150 miles. While refilling the tank, the driver notes that the vehicle
1. 4 answers
2. 1,358 views
A pine tree casts a 12-meter shadow on level ground. The angle of elevation from the tip of the shadow to the top of the tree is
1. 1 answer
2. 1,027 views
A diameter of circle that has endpoints (-4,12) and (8,-2), as shown below, is in the standard (x,y) coordinate plane. What
1. 1 answer
2. 491 views
Each element in a data set is multiplied by 2, and each resulting product is then increased by 5. If 'm' is the mean of the
1. 2 answers
2. 567 views
Each element in a data set is multiplied by 2, and each resulting product is then increased by 5. If 'm' is the mean of the
1. 4 answers
2. 684 views
If a,b,c,d, and x represent positive real numbers, what is the maximum value of the function f(x)= a[cosb(x+c)]-d?
1. 4 answers
2. 1,549 views
Considering all values of x and y for which x+y is at most 7, x is at least 2, and y is at least -1, what is the minimum value
1. 5 answers
2. 1,015 views
A pine tree casts a 12-meter shadow on level ground. The angle of elevation from the tip of the shadow to the top of the tree is
1. 3 answers
2. 1,173 views
Considering all values of x and y for which x+y is at most 7, x is at least 2, and y is at least -1, what is the minimum value
1. 3 answers
2. 281 views
Considering all values of x and y for which x+y is at most 7, x is at least 2, and y is at least -1, what is the minimum value
1. 1 answer
2. 326 views
An instrument store gives a 10% discount to all students off the original cost of an instrument. During a back to school sale an
1. 3 answers
2. 1,185 views
a 4.8 force acts on a 4.4 kg mass that sits on a frictionless table for 6.4 meters. What is the Kinectic Energy that the object
1. 1 answer
2. 307 views
a 4.8 force acts on a 4.4 kg mass that sits on a frictionless table for 6.4 meters. What is the Kinectic Energy that the object
1. 2 answers
2. 898 views
who was president during Muller vs. Oregon? Roosevelt or Taft?
1. 4 answers
2. 480 views
Why is it important to use caution before putting any personal information on a computer? (example(s) required)I think everyone
1. 2 answers
2. 486 views
i need help with answering homework questions
1. 2 answers
2. 473 views
If the median is greater than the mean on a set of test scores, describe the situation.
1. 1 answer
2. 471 views
How are the family
1. 1 answer
2. 257 views
Sometimes it took days until I could pull out the artifact that had staring me in the face, and not doing so beforehand had
1. 1 answer
2. 274 views
The field school was an amazing and eye-opening experience in which I was able to travel to an area I had never visited before
1. 3 answers
2. 326 views
1) "I would like to learn as much as possible as soon as possible"Should there be a comma after the first "possible?" 2)"The
1. 1 answer
2. 303 views
1) Their kindness will give me the gift of patience...does this sound okay? 2)In this method, I could learn from different areas
1. 2 answers
2. 890 views
Is the grammar in the following sentence ok?For, surely, the paintings were created by people who were not so different than
1. 6 answers
2. 676 views
I remember instances where I fell.when or where ?
1. 4 answers
2. 827 views
We all Crave Horror Movies essay by Stephen KingWhat does King mean in paragraph 4 when he says that horror movies are
1. 1 answer
2. 795 views
a driver who drives at a speed of r mph for t hr will travel a distance d mi given by d = rt miles. How far will a driver travel
1. 5 answers
2. 1,337 views
translate to an algebraic expression.13 less than b
1. 7 answers
2. 730 views
The four tires of an automobile are inflated to an absolute pressure of 200000 Pascals. Each tire has an area of 0.024 m^2 in
1. 3 answers
2. 503 views
name 2 homes where some of the most famous authors of Florida have lived and visit at least 2 places they have described in
1. 6 answers
2. 441 views
I need help with these problem please.X^2+6=15 (x+4)^2=6 can some one help me please.
1. 1 answer
2. 266 views
-9(x-3)^2=-7^3square root 4/3
1. 1 answer
2. 285 views
How does division work? Can you describe a picture of what happens during division?
1. 1 answer
2. 336 views
Can i combine the following? Explain why or why not.5x+4x(squared) 7x(cubic)-2x+x(cubic)-5x 3xy+2y
1. 3 answers
2. 343 views
Simplify the following (6b-2)(6b+2)+4(b^2-3b)Find the factors of the following e^2+8e+15 5f^2-15f+10 Does g^2-9 have factors? If
1. 3 answers
2. 349 views
We're reviewing and I forgot how to do this.Given y=x2-4+3 (x2 is x squared) a)write in standard from b)find vertex c)find
1. 2 answers
2. 527 views
calculate cell potential at 25C for:3Fe3+(aq) + AL(s)= 3Fe2+(aq)+ Al3+ (aq) if Fe3+ = 0.300 M, Fe2+ = 0.150M Al3+ = 0.300M. The
1. 3 answers
2. 2,254 views
A volume of 25.0 ml of 0.100 M CH3C02H is titrated with 0.100 M NaOH. What ispH after the addition of 12.5 ml of NaOH? (Ka for
1. 3 answers
2. 700 views
A volume of 25.0 ml of 0.100 M CH3CO2H is tiltrated with 0.100 M NaOH. What is pH after the addition of 12.5 mL of NaOH? (Ka for
1. 1 answer
2. 404 views
Calculate pH of 0.02 mol/L Ba(OH)2 solution. (Assume 100% dissociation).
1. 1 answer
2. 350 views
What is pH buffer of 0.1 mol L-1 Na2HPO4/O.15 mol L-1 KH2PO4?KH2PO4? Given Ka(H2PO4-) = 6.2 x 10-8). I would like to know the
1. 4 answers
2. 2,608 views
Given following reduction potentials in solution. Which is weakest oxidising agent in the list. List of numbers on right is for
1. 2 answers
2. 574 views
Which is the correct form of equilibrium expression of the following reaction.2PbS(s)+3O2(g)reverse arrow 2PbOs + 2SO2g Why is
1. 3 answers
2. 1,833 views
Police records in the town of Saratoga show that 18 percent of the drivers stopped for speeding have invalid licenses. If 16
1. 2 answers
2. 746 views
The fracture strength of a certain type of manufactured glass is normally distributed with a mean of 575 MPa with a standard
1. 2 answers
2. 515 views
The probability of a manufacturing defect in an aluminum beverage can is .00003. If 100,100 cans are produced,(a) Find the
1. 1 answer
2. 836 views
At an outpatient mental health clinic, appointment cancellations occur at a mean rate of 1.60 per day on a typical Wednesday.
1. 2 answers
2. 979 views
In a certain store, there is a .05 probability that the scanned price in the bar code scanner will not match the advertised
1. 2 answers
2. 895 views
I'm having a hard time understanding how to fine the Total Area(T.A) for a regular pyramid.
1. 1 answer
2. 452 views
1. Nitrogen gas and sodium liquid are produced by the decomposition of sodium azide NaN3 (s). what volume of nitrogen gas,
1. 5 answers
2. 1,059 views
The approximate vapor pressure of CS2 at 30 degrees Celsius?
1. 1 answer
2. 897 views
Complete the table below:For each of the following sets pick the compound with the highest conductivity in a 1 M aqueous
1. 19 answers
2. 636 views
VWXYZ is a rectangle-based pyramid where WX=66 cm and XY=32cm. The vertex is vertically above the center of the base. Given that
1. 6 answers
2. 2,349 views
Two 125 kg bumper cars are moving toward each other in opposite directions. Car X is moving at 10 m/s and Car Z at –12 m/s
1. 4 answers
2. 1,597 views
what is 4a-7=4(a-2)+1?
1. 1 answer
2. 244 views
How do I solve for:5000 = 45t^2 + 240t + 450
1. 1 answer
2. 348 views
Could someone please help me with this question?What is the relationship to the law and the government structure as it applies
1. 4 answers
2. 594 views
Could someone please help me with this question?What are crime rates? This is what I have so far: Crime rates are the number of
1. 3 answers
2. 559 views
Could some please help me with this? I am not sure what to really say. Thanks!Describe the historical development of police
1. 1 answer
2. 340 views
What influence does culture have on personality? Do you see a persons reaction to something as separate from social experience
1. 3 answers
2. 546 views
Why is oxygen less soluble in water as temperature of the water increases ?Are there any elements that are like this too?
1. 1 answer
2. 448 views
Assume that there is a perfect competition market for a good X. If one supplier all of a sudden wins the lottery and buys all
1. 1 answer
2. 513 views
For any distribution (normal or not normal), the probability of selecting a score greater than the median is
1. 4 answers
2. 1,150 views
farmer has 10 trees see if you can plant them so there are 5 rows of trees with 4 trees in each row
1. 4 answers
2. 2,896 views
A car traveling at 120 strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.90 .Wh
1. 3 answers
2. 593 views

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