Wednesday

September 2, 2015
Total # Posts: 217

**Makalema secondary school**

Aluminium reacts with oxygen to form aluminium oxide.How many grams of potassium chlorate would be heated to produce enough oxygen to form 5.1 grams of aluminium oxide?
*August 20, 2015*

**sito ilado senior school**

Maths
*July 8, 2015*

**math**

For a experiment, Jenna needs to make a dilute solution that is 10 ounces of 40% acid. But Jenna only has solutions that are 30% acid and 70% acid. How many ounces of 70% acid solutions should she use? A. 2.5 ounces B. 5 ounces C. 7.5 ounces D. 8 ounces Not sure if I would ...
*April 12, 2015*

**math**

Erin is making a pitcher of lemonade. Her pitcher is a cylinder with a diameter of 8.6x10^-2 meters and a height of 0.44 meters. What is the approximate total amount of lemonade that will fit in her pitcher? A.2.6 x10^-3 cubic meters B.1.0x10^-3 cubic meters C.2.6x10^-2 cubic ...
*April 12, 2015*

**Maths**

In a class of 39 pupils, 1/4 of the girls wear spectacles and 2/3 of the boys wear spectacles. A total of 16 pupils in the class wear spectacles. How many girls do not wear spectacles? Answer preferably in model method please.
*March 15, 2015*

**statistics**

approximately normal with mean 0.60 and standard deviation 0.0310
*February 21, 2015*

**Physics**

When you jump vertically 0.86 meters above the ground, what is your acceleration when you reach your highest point?
*February 18, 2015*

**algebra**

80 is 25%of what number
*January 14, 2015*

**hvac**

if the current is one half ampere when the resistance is 240 ohms, what is the current when the resistance is 540 ohms?
*January 6, 2015*

**Calculus**

Wheat is poured through a chute at the rate of 10 ft^3/min and falls in a cone-shaped pile whose bottom radius is always half its height. How fast is the height of the cone increasing when the pile is 8 feet high? Volume of a cone=1/3(pi)r^2h
*November 2, 2014*

**Calculus**

A stone is thrown into a calm pond and circular ripples are formed at impact. If the radius expands at the rate of 0.5 feet/second, how fast is the circumference and the area of the ripples growing when the radius is 3 feet?
*November 2, 2014*

**math**

An oil tank has a capacity of 45 gallons.At the beginning of October it is 80% full.At the end of October it is 1/3 full.How many gallons of oil were used in October? a. 21 b. 25 c. 41 d. 27 e. 30 my answer is (e)30, 45 x 1/3 =15 ,so 2/3 = 30
*October 1, 2014*

**math**

The diameter of a circle is increased by 50%.The area is increased by a. 50% b. 100% c. 125% d. 200% e. 250% please answer and explain
*October 1, 2014*

**math**

If the outer diameter of a cylindrical oil tank is 54.28 inches and the inner diameter is 48.7 inches,the thickness of the wall of the tank,in inches, is
*October 1, 2014*

**math**

How many gallons of water are needed to raise the level of a swimming pool 75' x 42' four inches above its present level? ( 1 cubic foot= 7 1/2 gallons )
*September 14, 2014*

**math**

If 4% of motorists on the Turnpike leave at a certain exit and 5% of these go to one particular motel for lodging,out of every 10,000 motorists how many motorists may be expected to go to this motel?
*September 14, 2014*

**math**

23. There are two telephone companies provide home phone service in New York City. Company A charges $25 monthly fee and $0.10 for one minute after 30 minutes phone call. Company B charges $20 monthly fee and $0.12 for one minute after 30 minutes phone call. By what minutes, ...
*August 25, 2014*

**check (math)**

56. Evaluate the following expression. (7^8x7^9)^10 This is what I did: 7^80x7^90 = 7^170
*August 25, 2014*

**math**

is it 13?
*August 23, 2014*

**math**

10. Michelle will divide 39 herbal tea bags and 91 mint tea bags among gift boxes. Each gift box will have the same number of herbal tea bags and the same number of mint tea bags. What is the greatest number of gift boxes Michelle can make?
*August 23, 2014*

**math**

8. How many different four digit numbers can be made from the digits 3,8,6, and 9 if each digit appears only once in the arrangement? Is the answer 10?
*August 23, 2014*

**math**

14. If a equals 50% of b, then in terms of a 50% of 5b is equal to what?
*August 23, 2014*

**math**

16. if (x^2-6x-16)/(x^2+8x+12)=2, what is the value of 4x?
*August 23, 2014*

**math**

35. If b is a positive integer less than 400 and more than 100, then how many integer pairs (a,b) satisfy the equation a/b=2/9?
*August 23, 2014*

**math**

I think the answer is D.
*August 23, 2014*

**math**

15. What is the mathematical average of number of weeks in a year, seasons in a year, and the number of days in January? A.36 B.33 C.32 D.31 E.29
*August 23, 2014*

**math**

7. What area remains when the area of a square with side 3 is subtracted from the area of circle with radius 2?
*August 22, 2014*

**math**

41. It takes Craig 20 minutes to type n pages. At these rates, how many hours will it take him to type 100 pages? All i know is 20/n
*August 22, 2014*

**math**

35. If b is positive integers less than 400 and more than 100, then how many integer pairs (a,b) satisfy the equation a/b=2/9?
*August 22, 2014*

**math**

20.Which of the following numbers could be described in the following way: an integer that is natural, rational and whole number? I think the answer is B A.0 B.1 C.2.33 D.-3 E.none of the above
*August 22, 2014*

**math**

I forgot to give you the choices: A.36 B.33 C.32 D.31 E.29
*August 22, 2014*

**math**

15. What is the mathematical average of the number of weeks in a year, seasons in a year, and the number of days in January? This is what I know so far: I know there is 52 weeks in one year.
*August 22, 2014*

**math **

3. If Leah is 6 years older than Sue and John is 5 years older than Leah, and the total of their ages is 41. Then how old is Sue? This what I have so far: L=s+6 J=L+5
*August 22, 2014*

**math**

48.Kate's class has between 40 and 51 students. Exactly of 75%of the students in her class have black book bags, and exactly 1/6 of students in her class do not have a book bag at all. How many students are in Kate's class?
*August 22, 2014*

**math**

35. If b is postive integers less than 400 and more than 100, then how many integer pairs (a,b) satisify the equation a/b=2/9?
*August 21, 2014*

**math**

12. For what value of x will x and 120 have the same mean as 34 and 53?
*August 21, 2014*

**math**

11.What is the slope of the line whose equation is 4y-6x+16=0?
*August 21, 2014*

**math**

25. If the area of the base of a circular pool is 942 square yards. What is its radius?(use pie=3.14)
*August 21, 2014*

**math**

23. There are two telephone companies provide home phone service in New York City. Company A charges $25 monthly fee and $0.10 for one minute after 30 minutes phone call. Company B charges $20 monthly fee and $0.12 for one minute after 30 minutes phone call. By what minutes, ...
*August 21, 2014*

**math**

If 4 coins are tossed simultaneously, what is the probability of getting exactly 3 tails?
*August 20, 2014*

**math**

21. If 6x+4y=40 and 7y/4x=7, what is value of x^2?
*August 20, 2014*

**math**

5. How many positive integers less than 36 are equal to 4 times an odd integers?
*August 20, 2014*

**math**

8/16575
*August 20, 2014*

**math**

9. Three cards are drawn at random from a standard deck of 52 card, without replacement. What is the probability of drawing a 7, drawing a 9, and a king in that order?
*August 20, 2014*

**math**

6. In a survey of 100 people, 73 owned only stocks. Six of the people invested in both stocks and bonds. How many people owned bonds only? This is what I did: 73+6=79 100-79=21
*August 20, 2014*

**math**

28. If the ratio of a to b is 4 to 5 and the ratio of a to c is 6 to 11, what is the ratio of b to c?
*August 20, 2014*

**math**

24. What is least common multiple of 2,3,4,5,6, and 7? This is what I did: 2x3x2x5x2x3x7=2520
*August 20, 2014*

**math**

On a coordinate system, the segment joining the points (3,8) and (9,16) has the same midpoint as the line segment joining the points (8,11) and (x,13). What is the value of x? I think x=3
*August 20, 2014*

**math**

Is it 4?
*August 19, 2014*

**math**

58. Let GCF (x,y) represent the greatest common factor of x any y. If p is a positive even integer less than 11, for what value of p does GCF (p^2,81) have the greatest value?
*August 19, 2014*

**math**

52. The mean of twenty numbers is 34. If four of the twenty numbers have a mean of 45, what is the mean of the other sixteen numbers? This is what i did: Is this right? 20x34=680 4x20x45=3600 3600+680/16=267.5 answer:267.5
*August 19, 2014*

**math**

47. If x=y-7, hat is the value of 6x-6 in terms of y?
*August 19, 2014*

**math**

wait, if its 5 years ago does it mean its 40?
*August 19, 2014*

**math**

50. 5 years ago, Jack was six less than twice of Kelly's current age. If Kelly was 20 years old three years ago, how old will be jack in 10 years? This is what I did: I got 55 J=(2k-6)+5 K=23 (2x23-6)+5 =45 45+10=55
*August 19, 2014*

**math**

49. How many integers between 70 and 105 have a reminder of 2 when divided by 15?
*August 18, 2014*

**math**

59. The scale on a map is 1 inch= x miles. What is the distance, in inches, on the map between two cities that are m miles apart?
*August 18, 2014*

**math**

14. According to the Texas Parks and wildlife Department, there are about 40 white-tailed deer per square mile in each of 35 Texas counties. A rectangular area on a ranch in one of these countries measures 2.25 miles by 6.7 miles. Which of the following is closest to the ...
*August 14, 2014*

**math**

19. Which statement describes the relationship between the line graphs of the equations below? y=-2x+4 y=0.5x+4 A.The line graph are the same line. B.The line graph are parallel lines. C.The line graph are perpendicular lines. D.The line graphs intersect, but are not ...
*August 14, 2014*

**math corrections**

16. Carlos sells video games on Web site. The cost for his web site is $75 per year. Carlos sells each video game for $25. What inequality can Carlos use to determine g, the number of video games he must sell to make a profit of at least $50 per year? A.100g less than and ...
*August 14, 2014*

**math corrections**

14. According to the Texas Parks and wildlife Department, there are about 40 white-tailed deer per square mile in each of 35 Texas counties. A rectangular area on a ranch in one of these countries measures 2.25 miles by 6.7 miles. Which of the following is closest to the ...
*August 14, 2014*

**math corrections**

10. You have a nickel, a dime, a quarter and a fifty-cent piece. A clerk shows your several articles, each different price and any one of which you could purchase with your coins without receiving change. What is the largest number of articles he could have shown you? A.8 B.10...
*August 14, 2014*

**math corrections**

300
*August 14, 2014*

**math corrections**

9. A rectangular field 50 meters in width and 120 meters in length is divided into two fields by a diagonal line. Find the length of fence in meters required to enclose one of these fields? A.130 B.170 C.180 D.200 E.300 Choice A is wrong.
*August 14, 2014*

**math test review**

15. Scott knows that the area of the center circle of the basketball court in the school gym is 110 square feet. He wants to find the radius of the center circle of the basketball court in the school gym. He determines that the square of the radius is 34 feet. What is the BEST...
*August 13, 2014*

**math test review**

5. A teacher prepares 12 sheets of colored paper for each of sheets her 25 pupils. If 5 pupils are absent, how many sheets of colored paper can each pupil now have? A.10 B.15 C.18 D.20 E.24 I think the answer is A.
*August 13, 2014*

**math test review**

2. If 4% of motorists on the New Jersey Turnpike leave at a certain exit and 5% of these go to one particular motel for lodging, out of every 10,000 motorists how many motorists may be expected to go to this motel? A.2 B.10 C.20 D.100 E.200
*August 13, 2014*

**math corrections**

is the answer 10?
*August 13, 2014*

**math corrections**

There are 10 men spent 10 days finishing one project. If we need to finish the project by 5 days, how many more men do we need? A.1 B.5 C.10 D.15 E.20 Choice E is wrong, i'm starting to think that choice B is the answer.
*August 13, 2014*

**math test review**

7.There are 400 couples competing in a dance contest. After each half hour one-fourth of the contests-ants are eliminated. How many couples will remain eligible fore the prize after the first hour? A.300 B.250 C.225 D.200 E.150
*August 13, 2014*

**math**

25. Julia is casting a play with 3 lead roles. Five students have tried out for each part. As long as no students have tried out for more than one part, how many different ways can Julia cast the lead roles? A.60 B.80 C.125 D.25 E.50
*August 11, 2014*

**math**

2. Five hundred people, and no others, gathered in front of the White House on certain day to protest the government's immigration policies. Of these 500 people, 60% wore red arm bands showing solidarity with the immigrants. Of this 60%, 20% carried signs. How many people ...
*August 11, 2014*

**math**

1. A box contains a number of items, among them exactly 10 hats, 3 books, and 7 statues. The remaining 1/3 of the items are all blue T-shirts. What percent of the items in the box are books?
*August 11, 2014*

**math corrections**

11. If 8x=(4y)^2 and x=8, where y is an integer, which one can be the value of 4y? A.-6 B.4 C.2 D.-4 E.-8
*August 11, 2014*

**math corrections**

30. The probability that Rob wins is 2/7 the probability that Rob loses,what is the probability that Rob loses? A.2/7 B.5/7 C.9/7 D.7/9 E.2/9 Choice B is wrong.
*August 11, 2014*

**math**

If v,w,x,y, and z are consecutive multiples of 3, counting from smallest to largest. What is the value of v-w-x+y in terms of z? A.4z-4 B.-12 C.-30 D.0 E.4z
*August 10, 2014*

**math**

4. A board jumper makes an average standing jump of 8 feet. In how many jumps will he cover y yards? I got B for this question. A.3y/8 B.8/3y C.24y D.1/24y E.24/y
*August 7, 2014*

**math**

3. A diamond ring valued at $7000 was insured at 80% of its value. What was the premium, if the rate was $6 per 1000? A.$3.36 B.$4.20 C.$33.60 D.$42.00 E.$336.00
*August 7, 2014*

**math**

2. A grocer paid $2600 for secondhand delivery truck. At end of 4 1/2 years he was allowed $440 for it toward the purchase of a new truck. What was the average yearly amount of depreciation? A.$220 B.$450 C.$480 D.$550 E.$2200
*August 7, 2014*

**math**

I have some problems with these questions: 3. A hat was priced at $10.80. During a sale, the hat sold for $9.18. What was the rate of discount on the hat? 4. A man's tax on his home is $1,952. The tax rate is $3.20 per $100 of assessed value of the home? I think I need to ...
*August 6, 2014*

**math test review**

7. Given that w=7r+6r+5r+4r+3r. Which of the terms listed below may be added to w to the resulting sum will be divisible by 7 for every positive integer r? A.7r B.6r C.5r D.4r E.3r
*August 6, 2014*

**math**

A refrigerator was marked down in a price from $249.50 to $199.60 during a sale. What was the rate of discount?
*August 6, 2014*

**math corrections**

in question 24,it is 300 revolution per minute, not 30 revolution per minute.
*August 6, 2014*

**math corrections**

2. A pair of pants sell for $6 more than 75% of its price. What is the price of the pants?
*August 6, 2014*

**math corrections**

its 300 revolutions per minutes. I made a mistake
*August 6, 2014*

**math corrections**

I got a few questions wrong and i would like some explanations on these question: 2. A pair of pants sells for $6 more than 75% of its price of the pants? A.$12 B.$18 C.$20 D.$24 E.$36 Choice E is wrong. 4. What is the wall thickness, inches, of a tube with an outer diameter ...
*August 6, 2014*

**science**

Explain why Na2CO3 against HCL titration using phenolphthalein indicator does not go to completion but stops at the NaHCO3 stage.
*November 25, 2013*

**social studies**

what were roles of men in Iroquois league?
*November 16, 2013*

**Vector Calculus**

Thermodynamics texts use the relationship (dy/dx)(dz/dy)(dx/dz) = -1 Explain the meaning of this equation and prove that it is true (Hint: Start with a relationship F(x,y,z) = 0 that defines x = f(y,z), y = g(x,z), and z = h(x,y) and differentiate implicitly)
*October 4, 2013*

**math**

not just answer and tell me how to do it
*August 4, 2013*

**math**

The length of the rectangle is 20 m and the width of the rectangle is 10 m. Inside the rectangle have two circle, If we know that both circle are the same and they are tangent to the rectangle? What is the shaded area? A. 200 - 20 pi m^2 B. 200 - 50 pi m^2 C. 100 pi - 200 m^2 ...
*August 4, 2013*

**math**

The fraction 5Y3X/2Y8, in which X and Y stand for unknown digits, represents a division which results in a quotient that is whole number. Which of the following is (are) true? not just and answer please I. X may equal 2. II. X may equal 6 or 0. III. X may equal 4. A.I only B....
*August 4, 2013*

**math**

I. X may equal 2. II. X may equal 6 or 0. III. X may equal 4. A.I only B.II only C.III only D.I and III only E.I,II,and III
*August 3, 2013*

**math**

The fraction 5Y3X/2Y8, in which x and Y stand for two unknown digits, represents a division which results in a quotient that is a whole number. Which of the following is (are) true? 1. X may equal 2. 11. X may equal 6 or 0. 111. X may equal 4. not just and answer, i don't ...
*August 3, 2013*

**math**

x + 2y = 1 1/3 +x - y =+1/3 3y = ? not just and answer A.0 B.- 1/3 C.1/3 D.1 E.1 2/3
*August 3, 2013*

**math**

but i'm not so good at subsets can you explain, so i can maybe understand in a different way.
*August 3, 2013*

**math**

which of the following sets is a subset of A? A:5,25,15,10,20,30 not just and answer A.5,15,60 B.10,20,50 C.5,10,20 D.15,30,60 well i got the answer C
*August 3, 2013*

**math**

thanks
*August 3, 2013*

**math**

mm, less
*August 3, 2013*

**math**

so it is 4315-1345= 2970
*August 3, 2013*