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Autumn

Questions (106)

solve the following set of equations by using substitution or elimination 2x+y=1 2x+3y=-41
1. 1 answer
2. 103 views
Find the limit of f(x) as x approaches 0.f(x) = [1-cos^2(3x)] / x^2 Is there a way to do this if we haven't learned L'Hopital's
1. 1 answer
2. 311 views
Which of the following is a Pythagorean Triple and would be the sides of a right triangle?A 3 , 5 , 8 B 5 , 12 , 24 C 12 , 16 ,
1. 2 answers
2. 290 views
Calculate the value of Kp at 227oC for the equilibrium: 3 A(g) ⇌ B(g) + D(g)Kc = 5.15
1. 1 answer
2. 543 views
For the equilibrium:CO(g) + 2 H2(g) ⇌ CH3OH(g) Calculate the value of Kp given these equilibrium partial pressures: carbon
1. 1 answer
2. 492 views
-24 • 5=?-100 -120 120 90 Idk what it is Lesson 5: Multiplication of Integers Math 6 B Unit 3: Integers please help!!
1. 7 answers
2. 1,366 views
What discovery did the study of fossil horse teeth lead scientists to make?a : Early horses had a specialized diet of grass, a
1. 15 answers
2. 3,751 views
Why are phylogenetic trees important in understanding evolutionary relationships among organisms?
1. 0 answers
2. 9,846 views
What is the average of 125 and 33
1. 1 answer
2. 203 views
Which of the following is/are rational number(s)? (choose all that apply)21 the square root of 5 4/5 pi
1. 1 answer
2. 297 views
which of the following is/are rational number(s)? 21, the square root of 5, 4/5, pi
1. 2 answers
2. 326 views
A model rocket with mass 1 kg is launched from the ground, starting from rest, and accelerates vertically due to an upward
1. 4 answers
2. 832 views
How many pounds of potting soil, which costs $0.04 per pound, should be mixed with 20 pounds of nutrient-rich soil, priced at
1. 1 answer
2. 620 views
Use your knowledge of the law of conservation of mass to answer the following question: In the lab, a student reacts lithium
1. 2 answers
2. 674 views
Ms. Sue's last words on this website were on December 7th to another student. She said, "Your Question?" Now, this might not
1. 50 answers
2. 5,540 views
Which of the following statements is true?A) Chemical reaction rates vary with the conditions of the change, but nuclear decay
1. 3 answers
2. 1,582 views
Together Paul and Jack earned $72 washing cars. Jack washed twice as many cars as Paul. If Paul washed 3 cars, how much did they
1. 2 answers
2. 486 views
Find the value of x1.92 = (0.015)^x / (0.0075)^x Thanks in advance!
1. 1 answer
2. 449 views
How did the South Texas elite interact with the Anglo settlers?A) Anglo settlers worked for South Texas Elite B) Anglos worked
1. 1 answer
2. 583 views
The Declaration of Independence stated that the colonists rights came from whom?
1. 1 answer
2. 623 views
Identify the substance liberated at each electrode during the electrolysis of AgNO3 with inert electrodes.I know that Ag is
1. 1 answer
2. 1,422 views
Solve: ((2^x)-7)^2 = 1The answer should be x = 2.58 (3 s.f.) or x = 3 but I have no idea how to get there. Thanks in advance!
1. 1 answer
2. 1,320 views
The following table shows how the initial rate of this reaction depends on the concentrations of the two reactants[NO] [O2]
1. 6 answers
2. 1,078 views
Prove the identity cos3x ≡ 4cos^3x - 3cosxThank you so much for the help!
1. 1 answer
2. 507 views
Reposting again since my previous question may seem like it's been answered. If I shouldn't do this just let me know :)The
1. 1 answer
2. 510 views
The probability that an event A occurs is P(A) = 0.3 . The event B is independent of A and P(B) = 0.4 .a) Calculate P(A or B or
1. 2 answers
2. 3,633 views
What mass of solid potassium sulfate, K2SO4, is used to make up exactly 100.0cm^3 of 0.100 mol/dm^3 SO4^2-?This should be a very
1. 1 answer
2. 735 views
How do I go about proving that:cos(4θ) + 4cos(2θ) ≡ 8cos^4(θ) - 3 Thanks in advance!
1. 1 answer
2. 3,530 views
If x^4 - y^4 = -15 and x^2 - y^2 = -3, what is the value of x^2 + y^2?
1. 1 answer
2. 435 views
A pretty confusing question with weird wording:If the concentration of a compound is 10mg/ml, and its molecular weight is
1. 2 answers
2. 616 views
The chart below shows the population distribution for the 2,400 occupants of the city of Centre Hill.Adult Male Adult Female
1. 2 answers
2. 1,274 views
If 8x + 8y = 18 and x^2 – y^2 = –3/8, what is the value of 2x – 2y?The answer is supposed to be -1/3 but I have no idea
1. 2 answers
2. 2,314 views
Pretty confusing AS Biology question:A scientist carried out an experiment to separate the organelles in an animal cell by mass.
1. 3 answers
2. 4,077 views
Ethanoic acid can be reacted with alcohols to form esters, an equilibrium mixture being formed.CH3CO2H + ROH <--> CH3CO2R + H2O
1. 1 answer
2. 3,907 views
The first three terms of an arithmetic progression are 2x, x+4 and 2x+7 respectively. Find the value of x.I have no idea where
1. 2 answers
2. 4,085 views
Which reaction would occur more readily? Why?1) Mg + Cl2 --> MgCl2 2) 2Mg + O2 --> MgO Thanks!
1. 1 answer
2. 501 views
How would you solve this?1/2 mv^2 - 1/2 m x 25 = mg x 100sin20 I obtained this from the question: A girl on a sledge starts,
1. 4 answers
2. 666 views
A car of mass 0.9 tonnes is driven 200 m up a slope inclined at 5° to the horizontal. There is a resistance force of 100 N.(i)
1. 1 answer
2. 1,164 views
Relative to an origin O, the position vectors of points A and B are given byOA = 3pi + 4j + p^2k, and OB = -pi + -1j + p^2k Find
1. 3 answers
2. 1,918 views
A block of mass 11 kg is at rest on a rough plane inclined at 30° to the horizontal. A force acts on the block in a direction
1. 1 answer
2. 2,868 views
Sulfur dioxide reacts with oxygen to form sulfur trioxide according to the equation2SO2(g) + O2(g) <-> 2SO3(g) Samples of sulfur
1. 4 answers
2. 3,946 views
When one mole of ammonia is heated to a given temperature, 50% of the compound dissociates and the following equilibrium is
1. 1 answer
2. 3,509 views
If x - y = 9, find the maximum value of xy^2Never seen this type of question before, any help? Thanks!
1. 1 answer
2. 452 views
How would you differentiate this equation?1/6(2x-3)^3 -4x Here's my working u = 2x-3 y = 1/6u^3 dy/du = 1/2u^2 du/dx = 2 dy/dx =
1. 1 answer
2. 322 views
Convert 3.16x10^3 in standard form
1. 3 answers
2. 1,652 views
Back again with another problem :)How do you calculate the enthalpy change, in kJ/mol for the reaction of copper(II) sulfate?
1. 1 answer
2. 1,339 views
Back with another question similar to the one I asked before, but this one's a bit more confusing4NH3 (g) + 5O2(g) → 4NO(g) +
1. 1 answer
2. 704 views
Use the information below to answer this questionC(s) + O2(g) -> CO2(g) ΔH = -394 kJ/mol H2(g) + 1/2 O2(g) -> H2O(l) ΔH = -286
1. 5 answers
2. 2,992 views
Solve the equation 2cos2x = √3 for 0°≤x≤360°I did this: cos2x = √3 /2 2x=30 x=15 x=15, 165, 195, 345 Is this correct?
1. 1 answer
2. 1,803 views
6sin(2x)+3=0How do you find the smallest value of x in the interval 0≤x≤π for which y=0? My work so far: 6sin(2x)=-3
1. 1 answer
2. 1,089 views
How would you write an ionic equation for: NH2SO3H + NaOH —> NaNH2SO3 + H2O?Is it simply H+ + OH- —> H2O?
1. 2 answers
2. 1,127 views
Is 107 X 10^4 A Scientific Notation
1. 2 answers
2. 420 views
A moving company charges $0.60 per pound for a move from New York to Florida. A family estimates that their belongings weigh
1. 4 answers
2. 3,455 views
Anais bought 4.5 yards of ribbon. She had 3 feet 8 inches of ribbon left after trimming some curtains. How many inches of ribbon
1. 1 answer
2. 1,421 views
Sean has $75 to spend on CDs. If each CD costs $6.98, about how many CDs can he buy?
1. 1 answer
2. 1,673 views
Many people believe that the Civil War is considered to be the worst war in American history. What is the basis for this belief
1. 1 answer
2. 819 views
What were the details of the Great Compromise?
1. 1 answer
2. 608 views
What is Oxytocin? Is this positive or negative feedback?
1. 1 answer
2. 525 views
What does the term "homeostasis" mean? What is one of the mechanisms used by our bodies to maintain homeostasis?
1. 1 answer
2. 725 views
An ice cream shop has 19 flavors. You also have the choice of a sugar cone, waffle cone or cup. If a person orders two scoops of
1. 2 answers
2. 2,195 views
Which of the following tools can bd used to measure mass?A) a graduated cylinder B) a triple beam balance C) a mercury
1. 6 answers
2. 2,227 views
1. One angle of a rhombus measures 60 degrees. If the perimeter ois 20 inches, find the length of both diagonals.2. An
1. 0 answers
2. 568 views
How do you write 200 7/100 as a decimal?!?
1. 2 answers
2. 434 views
Find the radius of a cone with a height of 14 cm and a volume of 718.4 〖cm〗^3, use 3.14 for X and remember to show all work
1. 1 answer
2. 491 views
When its brakes are applied, a car moving at 10 m/s undergoes an acceleration of -1.2 m/s2. How far does the car travel before
1. 0 answers
2. 787 views
While playing lawn darts with his friend, Jack notices that when he throws a dart up at 60 degrees it travels 11 meters. How
1. 1 answer
2. 747 views
Simplify. Write the answer using positive exponents only. (x^-5y^-6/a^-5)^-3
1. 1 answer
2. 739 views
There was a sidewalk sale at Mega Mall. Everything was marked down by30%. Rodrick bought 3 pairs of jeans originally priced at
1. 1 answer
2. 723 views
The altitude of a plane as it begins to descend is shown by the linear equationa = 22,000 – 800m, where a is the plane’s
1. 2 answers
2. 856 views
Sam downloaded four applications for $2.99 each to her cell phone. The remaining applications that Sam purchased cost $1.99
1. 1 answer
2. 547 views
6d-3d+2d=35
1. 1 answer
2. 232 views
Melissa collected three kinds of autumn leaves when she was out walking today -elm, maple, and oak. She has 2 times as many
1. 1 answer
2. 523 views
Melissa collected three kinds of autumn leaves when she was out walking today -elm, maple, and oak. She has 2 times as many
1. 1 answer
2. 593 views
The digit in the hundreds place is a square number, and it is odd.The digit in the tens place is 1 more than the square root of
1. 1 answer
2. 975 views
14. Why is “The Divine Comedy” an allegory?Everyone dies in the end. The theme is ambiguous. All of the characters and
1. 3 answers
2. 1,454 views
Talking about significant figures, my Physics textbook lists 5 rules for determining significant figures. 1) All nonzero digits
1. 0 answers
2. 668 views
The pH of vinegar is 2.40. Calculate the concentration of hydronium ions and hyrdroxide ions in vinegar.
1. 1 answer
2. 428 views
The pH of vinegar is 2.40. Calculate the concentration of hydronium ions and hyrdroxide ions in vinegar.
1. 1 answer
2. 415 views
How to round 63 for homework
1. 1 answer
2. 868 views
In 1920, the record for a race was 46.9 seconds. In 1940 it was 46.5 seconds. Let R(t)= the record in the race and t= the number
1. 0 answers
2. 466 views
A hummingbird has a mass of about 1.7 g. Suppose a hummingbird does 0.15 J of work against gravity, so that it ascends straight
1. 4 answers
2. 4,985 views
How did scientific discoveries change people's attitudes towards natural events and religious faith?
1. 2 answers
2. 522 views
My question is what would be the constant in a basketball ofensive rebound experiment? My science q is do the amount of
1. 0 answers
2. 524 views
Hello, I need help with this question, What factors in today's culture hinder wives from pursuing the C-H-A-I-R-S approach to a
1. 1 answer
2. 561 views
If GDP increases by 5 percent in the same that the deficit is run, What happens to gross debt as a percentage of GDP? What
1. 0 answers
2. 649 views
How would I simplify the complex fraction:3/x^3/1/x^2 ? Thanks
1. 2 answers
2. 581 views
What are the two vegetation types of Ethiopian Highlands?
1. 1 answer
2. 274 views
During a baseball game, a batter hits a pop-up to a fielder 94 m away.The acceleration of grvity is 9.8 m/s^2. If the ball
1. 1 answer
2. 622 views
The fastest recorded pitch in the MLB was thrown by Nolan Ryan in 1974. If this pitch were thrown horizontally, the ball would
1. 2 answers
2. 1,104 views
Part 1:Janet jumps off a high diving platform with a horizontal velocity of 2.67 m/s and lands in the water 2.6 seconds later.
1. 0 answers
2. 651 views
Part 1:A ball is thrown horizontally from the top of a building 28.6 m high. The ball strikes the ground at a point 80.3 m from
1. 1 answer
2. 664 views
Did Islam become more less influential in West Africa from the 700s to the 1400s?
1. 1 answer
2. 1,058 views
a car travels 59.78 miles east in 89.67 minutes, then 89.67 miles north in 59.78 minutes, and then 29.89 miles at 59.78 degrees
1. 2 answers
2. 559 views
a car travels 59.78 miles east in 89.67 minutes, then 89.67 miles north in 59.78 minutes, and then 29.89 miles at 59.78 degrees
1. 1 answer
2. 666 views
Brenda starts a merchanding business on December 1 and enters into three invfentory purchases:December 7 10 units @&6 cost
1. 0 answers
2. 606 views
For parts (a)–(c) use the following equation: y = 2/(x + 6).(a) Find the ordered pair that represents a solution to the
1. 2 answers
2. 567 views
For parts (a)–(c) use the following equation: y = 2/(x + 6).(a) Find the ordered pair that represents a solution to the
1. 1 answer
2. 429 views
Write each equation in standard form (set equal to zero). Then solve by factoring.Example: x²-2x=8
1. 1 answer
2. 1,306 views
One newspaper reported that the mayor received a salary increase of 5%. Another paper reported that the mayor's salary went up
1. 4 answers
2. 650 views
Describe the delegates who attended the Constitutional Convention.
1. 3 answers
2. 1,104 views

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