# Posts by David

Total # Posts: 2,277

**math test review**

16. If the base of a right triangle is 8 (square root)2 and the hypotenuse is 18, what is the area of the triangle? A.14 B.14 square root 2 C.56 square root 2 D.64 E.64 square 2

**math hw**

In set of 30 different positive integers, every number is even and/or a multiple of 3. If 22 of these numbers are even and 15 are multiple of 3, then how many of these numbers are multiple of 6?

**math hw**

2. If a^2-b^2=20 and a+b=2, what is the value of a-b? I added the a^2-b^2+20 and a+b+20, but i couldn't get the answer to equal a-b.

**math hw**

71

**math hw**

10.Thirty students in a chemistry class took a test on which the overall average score was 78. If the average score for 15 of those students was 85, what was the average score for the remaining members of the class? I know that "average" means dividing, but i'm ...

**math**

9. In Mr.chin's math class there were g girls and b boys. The number pf girls was 5 less than twice the number of boys. What is the value of g in terms of b? this is what I have so far: 2n-5

**Chemistry**

2Na + 2H2O------> 2NaOH + H2 H=-386kJ If 5g of sodium is added to 200g of water in an open container: (A) How much heat is absorbed/released int he reaction? (B)What volume in formed at 22C and 102kPa? (C) If boiling point elevation constant is 0.52K molal what is the ...

**maths**

The Park's are buying new carpet for their house.They need about 1,175 square feet of carpet.The carpet they buy is sold by the square yard. Estimate the number of square yards of carpet the Parks need for their house. Show your work.

**Astronaut launches bowling ball**

A 100 kg astronaut carries a launcher loaded with a 10 kg bowling ball; the launcher and the astronaut’s spacesuit have negligible mass. The astronaut discovers that firing the launcher results in the ball moving away from her at a relative speed of 50 m/s. The astronaut ...

**English**

She waited patiently for her turn on line at the New Age bookstore. adjective adverb noun verb

**Physics**

. A stone is dropped from the top of a building that is 500m high. Disregarding air resistance how long does it take the stone to reach the ground?

**math**

20

**math**

Charlie must choose a number between and that is a multiple of , , and . Write all the numbers that he could choose. If there is more than one number, separate them with commas

**Physics**

A 69.5kg football player is gliding across very smooth ice at 2.15m/s . He throws a 0.470kg football straight forward. A) What is the player's speed afterward if the ball is thrown at 16.0m/s relative to the ground? B) What is the player's speed afterward if the ball ...

**Math please check my answer?**

1)6x+11y=30 A) x-intercept= (-24,0);y intercept =(0,19) B)x-intercept=(0,1/5);y intercept=(11/30,0)<<<< C)x-intercept= (5,0);y intercept=(0,30/11) D)x-intercept= (24,0);y intercept=(0,19)

**Math please check my answers?**

1) The linear function f(x) contains the points (-10, -29) and (-2, 83). If g(x) = 25x - 50, which statement is true? A. The functions f(x) and g(x) both have positive slopes. <<< B. The functions f(x) and g(x) both have negative slopes. C. The function f(x) has a ...

**Algebra please check my answers**

Are 1 and 2 correct?

**Algebra please check my answers**

Thanks! Are the others correct?

**Algebra please check my answers**

1) The linear function f(x) contains the points (-10, -29) and (-2, 83). If g(x) = 25x - 50, which statement is true? A. The functions f(x) and g(x) both have positive slopes. <<< B. The functions f(x) and g(x) both have negative slopes. C. The function f(x) has a ...

**Algebra**

The table below represents the function f(x). (-6, 12),(-5,-8),(-4,-4), (-3,0),(-2,4),(-1,8),(0,12). If g(x) is a linear function that has a slope of -3 and a y-intercept of -9, which statement is true? A) The x-intercept of f(x) is less than the x-intercept of g(x). <<&...

**Cost Accounting**

A company’s sales volume averages 4,000 units per year. Recently, its main competitor reduced the price of its product to $48. The company expects sales to drop dramatically unless it matches the competitor's price. In addition, the current profit per unit must be ...

**Chemistry**

When 155 mL of water at 26 degrees Celsius is mixed with 75 mL of water at 95 degrees Celsius, what is the final temperature of the mixture? (d Water = 1.00 g/mL) Im really stuck on this problem and chemistry isnt exactly my strong point, thanks in advance!

**physicss**

a point charge -q, mass m is flying up at the speed v(0)= v 0 from the distance x(0)=L from a uniformly and positively charged thin plate, its linear density equal p. determine the maximum distance of a particle from the plate

**Physics**

a point charge -q, mass m is flying up at the speed v(0)= v 0 from the distance x(0)=L from a uniformly and positively charged thin plate, its linear density equal p. determine the maximum distance of a particle from the plate

**Astronomy**

v = c*sqrt(1-4/a) a = 4/θ^2 θ = sqrt(4/a) inverse formula sqrt(1-v/c^2), so in this case. v = c*sqrt(1-4/a)

**algebra**

Let f(x)= 2x^2 +7 and g(x)= x – 6. (a) Find the composite function (f*g)(x) and simplify. Show work. (b) Find ( f*g)(1). Show work.

**Pre algebra**

A cyclist rides her bike at a speed of kilometers per hour. What is this speed in kilometers per minute? How many kilometers will the cyclist travel in minutes? Do not round your answers.

**algebra**

when P dollars is invested at interest rate (I), compounded annually, for (t) years, the investment grows to (A) dollars, where A=P(1+I)^3. Find the interest rate if $40,960 grows to $49,130 in 3 yrs.

**Maths**

Fred is 10 yrs older than Ted. In 3 yrs time Fred will be 3 times as old as Ted. Let Fred be x yrs old now. Write an equation to represent this situation. Solve equation and state how old each person is now.

**Geometry**

tha area of a regular octagon found by decomposing the octagon into a rectangle into trapezoids is ________ m2

**chemistry**

I want to make sure I am correct in classifying whether the following properties of hydrogen are chemical or physical. thanks 1. hydrogen will burN in in oxygen to form water. CHEMICAL 2. hydrogen does not support combustion. CHEMICAL 3.hydrogen is usually found combined with ...

**Chemistry**

I am not sure if I understand how to balance this correctly. I need to write a balanced equation for the decomposition of solid copper(ii) sulfate to form gaseous sulfur trioxide and solid copper (ii) oxide. 2CuSO7 = CuSO4 + SO3 + CuO

**Chemistry**

Could someone please let me know if I have the answer to the following question correct? If my answer is incorrect could you please help me answer this question. what is the difference between 3M and 9M of sulfuric acid? I think the difference is that there are 3 moles of ...

**math**

A piece of rope is in the shape of a 12ft. by 16ft. rectangle. The same rope is then shaped into a square. What is the area of square?

**Physic Angular momentum and torque**

What is the angular momentum of a 1.0kg uniform cylindrical grinding wheel of radius 19cm when rotating at 1700rpm ?How much torque is required to stop it in 4.6s ?

**Physic Moment of inertia**

Determine the moment of inertia of a 11.1kg sphere of radius 0.794m when the axis of rotation is through its center.

**Algebra**

Graph the solution to the inequality on the number line |4u-8|=>12

**Chemistry**

10.1/50= 0.202

**physics**

The micrometer (1 μm) is often called the micron. (a) How many microns make up 1.5 km? (b) How many centimeters equal 1.5 μm? (c) How many microns are in 1.5 yd?

**algebra**

A box of candy contains two types of chocolates. One type is made with nuts, and the other type is nut free. The box contains 3 times more candies with nuts than candies without nuts. Johnny pulls a candy out of the box at random. What is the probability that Johnny pulled out...

**chemistry**

Combustion analysis of a hydrocarbon produced 33.01 g {\rm CO}_2 and 27.04 g {\rm H}_2{\rm O}. Calculate the empirical formula of the hydrocarbon. Express your answer as a chemical formula.

**Chemistry Urgent**

Calculate the DHof for the following reaction under standard state conditions: 2 Ag2S(s) + 2 H2O(l) ---> 4 Ag(s) + 2 H2S(g) + O2(g) Given the following information: Ag2S(s) ÄHof = -32.6 kJ/mol H2O(l) Ä Hof = -285.83 kJ/mol H2S(g) ÄHof = -20.6 kJ/mol

**Chemistry Urgent**

Consider the following problem: Target: 2NOCl(g) ? N2(g)+ O2(g)+Cl2 (g) ?Hrxn= ? Steps: 1. 1/2 N2(g) + 1/2 O2(g)? NO(g) ?H= 90.3 kJ 2. NO(g) + 1/2 Cl2(g) ? NOCl(g) ?H= -38.6 kJ As you determine the ¥ÄHrxn value for the target equation above, what must be done to step ...

**Chemistry**

Consider the following problem: Target: 2NOCl (g) ¡æ N2 (g) + O2 (g) + Cl2 (g) ¥ÄHrxn= ? Steps: 1. ¨ö N2(g) + ¨ö O2(g) ¡æ NO(g) ¥ÄH= 90.3 kJ 2. NO(g) + ¨ö Cl2(g) ¡æ NOCl(g) ¥Ä H= -38.6 ...

**algebra (solve for y)**

woops there is a 2 in front of the first e&(2y). Proper equation: 0=2e^(2y)-e^(y)

**algebra (solve for y)**

0=e^(2y)-e^(y) Need to solve for y here, don't understand why answer is -ln(2) in the book. Thanks.

**poetry part 2**

I think its C.Peace

**Physics**

No, youa are wrong. It is not mVa = .1m(Va-V) + .9mVb it is mVa = (-).1m(Va+V) + .9mVb it is not 2, it is 20/9

**Math**

what is the sum of the solutions of the equation |2x-7|=11? A) -9 B) -7 C) 5 D) 7 E) 9 ***What is the most efficient way to solve this?

**English**

Can you help me identify the subordinate clause in the sentence The camel is the only pack animal that can stand the test of the Sahara. Would the subordinate clause be "than can stand the test of the Sahara?"

**English**

Having trouble identifying subordinate clauses in the following sentences. 1. The airplane that we saw can land in only a few airports in this country. I think for this sentence the subordinate clause would be "that we saw." 2. The coin that I purchased is an old ...

**English**

To your question Which of these clauses cannot stand alone? The hummingbird is the only bird that can fly backward, I would say "that can fly backward" cannot stand alone.

**English**

In the sentence, The hummingbird is the only bird that can fly backward, the verb is either "is" or "can fly" I cannot determine what the subordinate clause is.

**English**

Find the subordinate clause in the sentence The hummingbird is the only bird that can fly backward.

**English**

I think the correct sentence is number 2, "on the hill."

**Geometry**

According to the given information, segment AB is parallel to segment DC and segment BC is parallel to segment AD.. Construct diagonal A C with a straightedge. It is congruent to itself by the Reflexive Property of Equality. ________________. Angles BCA and DAC are congruent ...

**chemistry**

A gas with a volume of 6.65 L at a pressure of 1.22 atm is allowed to expand until the volume raises to 54 L. What is the new pressure (in atm)?

**Biology**

A typical organism that might occupy a forest in the southwestern United States is a a. Cactus b. grizzly bear c. parrot d. polar bear

**ITT Tech**

Simplify -(-15x)-3x

**Personal Dimensions of Education**

seem

**Maths**

Calculate the simple interest on R3 500 invested at 6% per annum for 3 years

**literary**

What emotion is associated with weariness? I'm supposed to analyse the emotions that are expressed within a text, and the beginning is happy and jubilant while the second half adopts a more weary mood, so i'm wondering what emotion would i use?

**math**

least to greatest 3/4 2/3 7/8

**AP Chemistry**

aluminium oxide

**Math**

A math teacher wishes to use groups of 5 and/or 7 students for a class assignment. When she tries to make assignments she notices that it cannot be done with the number of students in her class. However, if the number of students were any larger, the assignments could be made...

**physics**

Wavelength in a Closed Column Here is the prompt: We place a speaker near the top of a drinking glass. The speaker emits sound waves with a frequency of 3.75 kHz. The glass is 14.1 cm deep. As I pour water into the glass, I find that at certain levels the sound is enhanced due...

**Math**

How do I give a BIG THANK YOU TO MS SUE?

**Math**

Hi Ms Sue Thank you sooooooo much I kinda thought that was it but........ there are 6 blueberry right?

**Math**

I was out of school for 4 days! I tried to catch up but....I need help with There are 20 muffuns on a plate. 2/5 are chocolate. 3/10 are vanilla. How many chocolate how many vanilla? Challenge: Rest are blueberry how many blueberry? Can somebody answer this for me and show me ...

**chemistry**

equation for joules needed to increase water temp

**ASAP Help thankies everybody History**

Ms. Sue? is it a?

**ASAP Help thankies everybody History**

No it is a

**IT WEB SYSTEMS**

Provide a real-life application in which you manipulate data in a string or an array format. Describe the situation, manipulation process, and data result.

**Science**

I read the article already, but I don't understand what is the answer. I am not sure if the question is referring to the the complementary base or something?

**Science**

RNA is to U(Uracil) as DNA is to ? a. Cytosine (don't think so) b. Guanine (don't think so) c. Thymine d. Adenine

**math**

If a test has 25 questions with 4 possible answers per questions, how many possible answer combinations are there?

**Question help**

Reading titles and headings, and trying to get an overview of what lies ahead in a reading passage is called: A:questioning B:relating C:surveying D:reciting

**maths literacy,history,geography,cat and english**

dont know career

**Geometry**

Use the figure of a square pyramid to answer the following questions. a.) Find the total surface area of the pyramid. b.) Find the volume of the pyramid. Do not answer them. I know How to find the answer. Surface Area is squared right?

**Geometry**

A person who is 5 feet, 6 inches (5.6 feet) tall casts a shadow (from N to S) that is 12 feet long. The distance along the ground from the person (N) to the flagpole (G) is 18 feet. Find the height of the flagpole (FG) showing all calculations.

**math**

ann uses three 1/4 size strips to model 3/4. She wants to use 1/8 size strips to model an equivalent fraction. how many 1/8 size strips will she need?

**geometry**

A person who is 5 feet, 6 inches (5.5 feet) tall casts a shadow (from N to S) that is 12 feet long. The distance along the ground from the person (N) to the flagpole (G) is 18 feet. Find the height of the flagpole (FG) showing all calculations. What is the length of SP and PF?

**Ashford**

Assimilation

**Science**

How much heat is absorbed when 500g of water goes from 25 to 35 degrees

**Biology**

How many chromosomes are in a human blood cell? What term describes a picture of the human chromosomes arranged in pairs?

**Physics**

Find the tension T2 of the box hanging from the rope if 1 = 25°, 2 = 65°, T1 = 60.58 newtons, and W = 143.4 newtons.

**math**

I have this question and this helped me, thanks! :)

**math**

If the circumference of a circle is 16 pi, what is its area ?

**math**

In triangle XYZ, the measure of angle Y is twice the measure of angle X, and the measure of angle Z is three times the measure of angle X, what is the measure of angle Y ?

**Math**

-1,0,1,0,1,2,3,6,11,20,37,68,125,230,423,778...

**Biology**

Do breeders observe the genotypes or phenotypes in their organisms?

**geometry**

Kendra is flying a kite 35 feet in the air. The angle of depression from the kite to where Kendra holds the string is 32 degrees. If Kendra holds the string 3 feet off the ground, what is the distance from her hands to the kite? Round your answer to the nearest tenth.

**Physics**

y= -0.42 The region isn't between the wires

**elementary statistics**

A statistics professor is used to having a variance in his class grades of no more than 100. He feels that his current group of students is different, and so he examines a random sample of midterm grades (listed below). At 0.05 alpha level can it be conculded that the variance...

**elementary statistics**

A statistics professor is used to having a variance in his class grades of no more than 100. He feels that his current group of students is different, and so he examines a random sample of midterm grades (listed below). At 0.05 alpha level can it be conculded that the variance...

**Trigonometry**

Cot θ = 1/Tan θ = Cos θ/Sin θ = - SQRT of 15/7 =

**Trigonometry functions**

find the reference angle of -11pi/3

**Trigonometry functions**

sketch the angle 2pi/3

**Trigonometry**

Write sin(125°) in terms of its cofunction. Make sure your answer is a function of a positive angle.

**Trigonometry**

Write sin (125°) in terms of its cofunction. Make sure your answer is a function of a positive angle