# Posts by William

Total # Posts: 365

**geometry**

In triangle $ABC$, $BC = 4$, $AC = 3 \sqrt{2}$, and $\angle C = 45^\circ$. Altitudes $AD$, $BE$, and $CF$ intersect at the orthocenter $H$. Find $AH:HD$. I tried using the pythagorean theorem to find side lengths, algebraically, but I couldn't find anything. Help!

**geometry**

Isosceles $\triangle{ABC}$ has a right angle at $C$. Point $P$ is inside $\triangle{ABC}$, such that $PA=11$, $PB=7$, and $PC=6$. Legs $\overline{AC}$ and $\overline{BC}$ have length $s=\sqrt{a+b\sqrt{2}}$, where $a$ and $b$ are positive integers. What is $a+b$?

**Geometry**

In trapezoid $ABCD$, $\overline{AB}$ is parallel to $\overline{CD}$, $AB = 7$ units, and $CD = 10$ units. Segment $EF$ is drawn parallel to $\overline{AB}$ with $E$ lying on $\overline{AD}$ and $F$ lying on $\overline{BC}$. If $BF:FC = 3:4$, what is $EF$? Express your answer ...

**Regression Equation**

I am confused I worked out the following and I got the wrong answer Can anyone explain where I went wrong for future reference please it is in case it ever comes up again Equation of Yi=a + bxi. -0.5(4.86/3.50) or 4.86/3.50*-0.5 Time spent on PC predictor Time spent working on...

**Chemistry**

How many liters of CO2 will be formed from 200. grams of this sugar at STP? C6H12O6--2C2H6O+2CO2

**Spanish**

The answer is A since "good looking" means "guapo" and obviously man is "hombre". :)

**Trig/PreCalc**

Find a parametrization for the line segment with endpoints (5,2) and (-2, -4).

**math**

arrange smallest to largest 3/4,2/3,5/9,5/6

**Chemistry**

If an astronaut weights 804n on earth what would he weight on a planet that has 3 times the mass and twice the radius of earth

**Physics**

A space station, in the form of a wheel 197 m in diameter, rotates to provide an “artificial gravity” of 2.5 m/s2 for persons who walk around on the inner wall of the outer rim. The rate of the wheel’s rotation in revolutions per minute that will produce this ...

**math**

The surface area covered by a rectangular playground is 100 square yards. The width of the playground is 15 yards longer than its length. Using factors, find the length and the width of the playground.

**Social Studies**

The question on the work book is, What country set up the first merchant company?

**Social Studies**

What country set up the first merchant company

**Physics**

A 5.7 g bullet leaves the muzzle of a riﬂe with a speed of 636.8 m/s. What constant force is exerted on the bullet while it is traveling down the 0.5 m length of the barrel of the riﬂe? Answer in units of N

**Mathematics**

It is 8,000. Don't know exactly how to explain it becuz i got the wrong answer and my friend is a math genius.

**statistics**

y=8+13x

**engineering**

Statistic is a multi billion dollar market. As long as you have the company's approval to gather statistics/data on their products, there is not ethical dilemma.By getting their approval they will ask for that data in return. Selling the data would become a problem. What ...

**Math**

Ali went to the supermarket to buy 3 sweets and 8 bars of chocolate. He paid $29. If 8 sweets and 3 bars of chocolate cost $15, find the average cost of 2 sets and 2 bars of chocolate.

**Geometry**

You must have the answers provided here, Jason, for us to answer.

**science**

A mass of o.8 kg water at 25c is mixed with m kg of boiling water.The resultant temperature is 40c.Then find m is

**Art**

1.A 2.C 3.B 100% right, i just took it. your welcome!:)

**life orientation**

Six ways that the human rights violation influence individuals, groups and the broader south african community

**Chemistry**

Which must be the same when comparing 1 mol of oxygen gas, O2, with 1 mol of carbon monoxide gas, CO?

**Algebra**

Sorry Steve, I miscopied the data, the x values for weeks 2 and 3 week 2 is actually 300 on sales and week 3 is 700 on sales, my bad

**Algebra**

Michael's total weekly pay includes a base salary plus certain percent of his sales. The table below show Michael's sales for 4 weeks and his total weekly pay. This data represents a linear function. What is Michael's weekly base salary? Sales (x)week 1: $800 week ...

**Vectors, Math**

A is (3, 2) and point B is 4 units from A in the direction (1,-1) Find AB(arrow). Find the coordinates of B. I can't do this question, Ive attempted it many times.

**Math**

Search up how to solve simultaneous equations. Substitution/ elimination method

**Algebra**

Hi guys, Im doing algebraic fractions and I got this fraction: (x^2+2x+1)/(x^2+1) , but the answers say that this is correct: (x^2-1)/(x^2-2x-1). So is (x^2+2x+1)/(x^2+1) = (x^2-1)/(x^2-2x-1)? Thanks in advance

**Algebra**

Use pythagoras, a^2+b^2=c^2 a=12, b=5

**Chemistry**

thanks @DrBOb222 :)

**Chemistry**

A sample of calcario and other components of the soil was intensely warm. Under these conditions, the calcario undergoes decomposition in calcium oxide and carbon dioxide. CaCO3 (s)-> CaO (s) + CO2 (g) The analysis of 71, 42 g of a sample of limestone supplied 13 g of ...

**physics**

3 equal charges each of of 2*10-6 C are fixed at three corners of an equilateral triangle ofsides 5 cm.find the column force experienced by one of the charge due to the other two

**physics**

3 equal charges each of of 2*0.000001C are fixed at three corners of an equilateral triangle ofsides 5 cm.find the column force experienced by one of the charge due to the other two

**Math**

Fit the rule: AEFHIKLMN. Did not fit the rule: BCDGJOP.What is the rule?

**Calculus**

Steve you plug the x value into the y formula which causes you to add 1 to the even value... always check your work.

**chemistry**

A 1L flask contains 0.2moles of air open to atmosphere at 0degree celcius. Upon heating some of the air is lost. What is the percentage of air remaining in the flask?

**Life orientation**

3 corses or study fields you are interested in following after grade 12

**Math**

A three-strand wire fence around a square 40-acre parcel would require how much wire?

**Math**

A road runs along the south boundary of the SW 1/4 of the SW 1/4 of a section. If the road contains two acres in the area, the width of the road would be: The answer is 66 feet, but I can't calculate it.

**Social Studies**

1 A 2 B

**math**

Develop a unit of learning at the end of which learners should be able to: reduce any angle in the first quadrant of a Cartesian plane to a difference of 90 and an acute angle. I have tried it as follows: 1. write down any three acute angles. 2. draw the angles in a Cartesian ...

**chemistry**

using the Kw for pure water, show that: pH = pKw - pOH

**math**

the area of the pool is 108m. what is the length of the pool if it is 9m wide

**Math**

We can factor $f(x)$ as $$f(x) = \frac{x \cdot x}{(x-1)(x+1)}.$$ So if we write out the product, we see that $f(2) \cdot f(3) \cdot f(4) \cdots f(n-1) \cdot f(n)$ is $$\frac{2 \cdot 2}{1 \cdot 3} \frac{3 \cdot 3}{2 \cdot 4} \frac{4 \cdot 4}{3 \cdot 5} \cdots \frac{(n-1) \cdot...

**Math**

the questions says if carlos eats 1/2 icream every night for dessert. He has 3 cups left. How many days can he eat a 1/2 cup before running out. How do I solve this problem

**Chemistry**

Consider that: the tetravalent cation of an isotope has 78 electrons and 128 neutrons; Nuclear relative mass of the same cation is 1.44% higher than the relative nuclear mass of its most common isotope based on these data, calculate the number of neutrons isotope

**Chemistry**

Consider that: the tetravalent cation of an isotope has 78 electrons and 128 neutrons; Nuclear relative mass of the same cation is 1.44% higher than the relative nuclear mass of its most common isotope based on these data, calculate the number of neutrons isotope.

**Math**

math puzzle: i am less than 3000. all four digits are odd. all four digits are different. the sum of my tens digit and ones digit is 16. i am divisible b 13. who am i? Ans: the thousand digit must be 1, the hundreds digit is 3 or 5. The tens and ones digits are 9,7 or 7, 9. So...

**united staes history**

what generalization can you make about the abolition of slavery in the north?

**Math**

its nither

**Math**

Fred needs a piece of plywood 39in. by 23in. he cut it out of a piece that was 4ft. by 8ft.What is the area in square inches of the piece that was left?

**math**

A cyclinder cooling tank has an outside diameter of 6.00 ft. the wall on all sides are 5.00in thick and the tank is 10.0ft tall. how many gallons of water will this tank hold?

**math**

A cyclinder cooling tank has an outside diameter of 6.00 ft. the wall on all sides are 5.00in thick and the tank is 10.0ft tall. how many gallons of water will this tank hold?

**math**

A rectangle piece of gold has dimensions 0.3125in. by 18.0in by 15.0 in what is its total surface area? if gold weighs 0.698lb/in3, determine its weight.

**tech math**

Each cylinder bore of a cylinder engine has a diameter of 2.50in. and a height of 4.90 what is the combined total surface area of all four cylinder?

**Social studies PLEASE HELP!**

thx i was working on that on that for 1 1/2 hours

**Trig application**

I can't figure this out. A famous golfer tees off on a long, straight 459 yard par 4 and slices his drive 10 degrees to the right of the line from tee to the hole. If the drive went 288 yards, how many yards will the golfer's second shot have to be to reach the hole?

**Social Studies**

thx

**Science**

What is the average for 4cm 5cm and 5cm

**english**

Critic

**Chemistry - Radioactivity**

The activity of a sample of Ba-137m has decreased by 75% from its initial activity after 5.10 minutes. What is the half-life of Ba-137m? What fraction of activity remains after 6.25 minutes? (A=Aoe (-kt); k = .693/t1/2)

**math**

Train #1 leaves san diego at 4pm. train #2 leaves san diego at 6pm.train #2 travels 42 mph faster than train #1. if train # 2 overtakes train #1 at 8pm, what is the speed of each train?

**math**

Please I need help with this problem. it took us 3 hour to drive to a concert.on his way home he increased his speed by 19 miles got home in 2 hours . what was the speed? thank you

**pre algebra**

hank you Reiny.

**pre algebra**

it took us 3 hour to drive to a concert.on his way home he increased his speed by 19 miles got home in 2 hours . what was the speed

**geometry**

The endpoints of are A(2, 2) and B(3, 8). is dilated by a scale factor of 3.5 with the origin as the center of dilation to give image . What are the slope (m) and length of ? Use the distance formula to help you decide: .

**Pre-ALgreba**

13.2

**Algebra**

The measure of the smallest angle of a triangle is one-fourth the measure of the largest angle. The measure of the second angle is 36 less than the measure of the largest angle.

**Maths pure, economics, business studies, geography**

Which careers or courses i should do doing those subjects

**Mathematics , business studies , economics , geography**

Which courses or careers i should follow doing those subjects

**Algebra 1**

thank you for all the help

**Algebra 1**

A right triangle has 1 leg that is 2" longer than the other leg. the length of the hypotenuse is sqrt 130" Find lengths of legs 0=2x^+4x-126

**Algebra**

The legs of an isosceles triangle are 0.3 foot less than twice the base. The perimeter of the triangle is 4.9 feet. What is the length of one of the triangle’s legs?

**Physics**

what kind of particles make up gaseous compounds, liquid compounds and solid compounds

**Child Development**

Research has shown that most preschool A.don't use the words "think,"remember or pretend c. believe that an event can be known without being directly observes. D. often insist they've always known information they just learned

**Physics**

Calculate the energy released when 235 U fissions resulting in two lighter stable nuclei with mass numbers 140 and 93.Please help!

**Physics**

I used this equation: Change in x = (velocity^2/2*mu*gravity)

**Math**

A giant pumpkin is 90% water and weighs 250 pounds. The pumpkin is placed on display as the largest pumpkin of the year at the LA county fair. During the week-long fair, the pumpkin loses water from being outside in the heat. At the end of the week, the pumpkin is only 80% ...

**chemistry**

i want to neutralize a 10 ml 3 molar sulfuric acid using calcium carbonate but don't know how to do the math the explanation confused me. (also i have to use sig fig and uncertainty)

**chemistry**

How many grams of calcium carbonate would it take to neutralize if i have 10ml 3 molar sulfuric acid? (can this be explained in detail?)

**chemistry**

i think you meant carbonate not bicarbonate

**physics**

1.6km

**History Help?**

What role did Stephen Austin play in the settlement of Texas by American colonists? He defeated Santa Anna's army, making it safe for colonists in the region. He convinced American colonists in Texas to declare their independence from Mexico. He received a large land grant...

**Maths**

The nth term of a series is 2^n-1 +5n. Find the sum of the first n terms. (Hint: This is an expression in terms of n).

**Math (Can someone Help)**

The temperature was 48.2° when Marcy went to bed and 35.7° when she woke in the morning. What was the change in temperature? A: 83.9° B: 82.5° C: 13.5° D: 12.5° < -- ? Carlos bought 3 gallons of ice cream for $9.50. Which proportion can be used to ...

**Math *checking answers*?**

Yeah I noticed that, but I didn't pick either because they were the same. Thank you(:

**Math *checking answers*?**

The temperature was 48.2° when Marcy went to bed and 35.7° when she woke in the morning. What was the change in temperature? A: 83.9° B: 82.5° C: 13.5° D: 12.5° < -- ? Carlos bought 3 gallons of ice cream for $9.50. Which proportion can be used to ...

**Statistics**

In a population, heights of males are normally distributed with u=180 cm and sigma^2=16 cm^2, while the heights of females are normally distributed with u=170 cm and sigma^2= 25 cm^2. a) One random male and one random female are selected from the population i)What is the ...

**Art**

1. Why would an artist chose to use harmony in a piece of artwork? 2. Perspective drawings will utilize all methods listed here except? 3. To create an image that is not harmonious, an artist could...?

**Gramma**

To Ms. Sue: Thank you very, very much for your help.

**Gramma**

Ms. Sue please check this complex sentence. The high school band became ebullient upon recieving the news that they won first place in the band competition.

**Gramma**

Although his political campaign was fallacious, the people voted for him anyway. Ms Sue please check this thank you.

**Gramma**

How can I use the word fallacious in a complex sentence?

**English**

How is the word brusque used in a complex sentence? please give examples.

**physics**

A cable with 24.0N of tension pulls straight up on a 1.02kg block that is initially at rest What is the block's speed after being lifted 2.20m ? Solve this problem using work and energy. Express your answer with the appropriate units.

**physics**

why is it that drivers place cement blocks and other heavy items in the trucks of their vehicles? (think of friction and normal force)

**English**

@ words : 1- curtail 2- devastate 3- digress 4- incentive 5- incorporate 6- indispensable 7- intermittent 8- rigor 9- squander 10-succumb Linda never had to work hard to make good grades in high school. But in college, where the ___(8)___ of course work were greater, she soon ...

**math**

1/7 will be the ans

**math**

2/3 = 14/21 21-14-4 = the # of the beads left that # = 3 so 3 bead should be white