# Posts by Alex

Total # Posts: 3,766

**Math**

Hi, I need help with figuring out how I calculated this question because my math teacher is asking "But my question is how do you get √2/2 How did you come up with that calculation?" Here's the question and my work for it: Chang is participating in a ...

**Math**

why would I have uarrived at square root 2 over 2 in this question Chang is participating in a charity bicycle road race. The route starts at Centreville and travels east for 13 km to Eastdale. He then makes a 135° turn and heads northwest for another 18 km, arriving at ...

**6th grade math**

a diver's elevation is -30 feet relative to sea level. she dives down 12 feet. what is her elevation after the dive? a. 12 feet b. 18 feet c. -30 feet d. -42 feet

**physics**

Consider three force vectors F1 with magnitude 42N and direction 140°, F2 with magnitude 27N and direction -110°, and F3 with magnitude 19N and direction 120°. All direction angles 0 (0 with a line inside) are measured from the positive x axis: counter-clockwise ...

**physics**

A person walks 27m east and then walks 31m at an angle 38° north of east. What is the magnitude of the total displacement. Answer in units of m

**physics**

A particle undergoes two displacements. The first has a magnitude of 135cm and makes an angle of 114° with the positive x axis. The resultant displacement had a magnitude of 183cm and is directed at an angle of 21.8° to the positive x axis. Find the magnitude of the ...

**physics**

A car travels 15.5 km due north and then 38.6 km in a direction φ = 74.3 ◦ west of north.Find the magnitude of the car’s resultant displacement. Answer in units of km

**physics**

A frictionless massless pulley has 7 kg tied to a cable on the left side and an unknown mass (M) on the right. The unknown mass accelerates downward at 6.6 m/s2 What is the accelerationof the system/tension of the rope

**polar co ordinates**

thanks so much ill have a look

**polar co ordinates**

how do you obtain the cartesian equation for r^2=16cos(3theata)?? I've tried looking on many website and at my notes but have had no luck. i know that r^2=x^2+y^2 and x=rcos(theta) but don't know were to go from here?

**finance**

45

**Calculus**

derp

**physics**

suppose the force of 20.0 N pushes on two boxes of unknown mass. We know, however, that the acceleration of the boxes is 1.25 m/s2 and the contact force has a magnitude of 2.73 N. (a) Find the mass of box 1. (b) Find the mass of box 2. So do I subtract the contact force from ...

**physics**

In a tennis serve, a 0.070 kg ball can be accelerated from rest to 41 m/s over a distance of 0.90 m. Find the magnitude fo the average force exerted by the racket on the ball during the serve. I know it is a force problem, but I am not even sure how to set this up.

**Math**

What are the restrictions on x if the solution to the equation -4 - square root 4-x=6 involves real numbers?

**Physics**

The mass of a sports car is 1200 kg. The shape of the car is such that the aerodynamic drag coefficient is 0.250 and the frontal area is 2.30 m2. Neglecting all other sources of friction, calculate the initial acceleration of the car ,if it has been traveling at 85 km/h and is...

**Science**

no the answer is really B OK

**economics**

I need to address computer ability to grow the Gross domestic product ,create competition and make other industries efficient help me?

**math**

Mr. Winsett and Ms. Phelps are having a back to school party. Mr. winsett brought 48 hot wings and mrs. phelps brought 18 cans of soda. what is the greatest amount of people that can come and share the food equally with no left overs

**Physics**

A baseball is hit straight up in the air with an initial velocity of 26.7 m/s. How long in seconds does it stay in the air? (Hint: What is the overall distance of the ball?)

**Math**

f(x) = logx2

**Math**

A company manufactures fence sections for residential use. The number, s, of sections that can be produced per day is related to the number of hours, h, of labour required by the function s=2.1 square root h (Show your work) a) State the domain and range for the function. (2 ...

**algebra**

What is a quartic polynomial function in standard form with zeros 1, –2, –2, and –3?

**Chemical Engg**

Hello, where can i find the process flow diagram of a dyehouse? I searched on google, but in vain I really need a picture showing all the steps in the dyehouse plz!!

**Math**

A ball that is hit or thrown horizontally ball that is hit or thrown horizontally with a velocity of v metres per second will travel a distance d metres before hitting the ground, where d=v square root h/ 4.9 and h is the height, in metres, from which the ball is hit or thrown...

**math**

43.478%

**Chemistry**

5ml

**Physics**

A basketball is thrown at 45° to the horizontal. The hoop is located 6.2 m away horizontally at a height of 1.1 m above the point of release. What is the required initial speed? I know that I need to use d = vit + (0.5)at^2, but I then get stuck. Thanks!

**Algebra**

(3x^2-4x^3+7)+(-5x+11-7x^3-4x^2)

**Math**

What is the answer to 4 square root 1280 r^8 t^12 ?

**Chemistry**

How many grams of HCl are produced if the following reaction yielded 27.1 grams of H3PO4? PCl5 + 4 H2O --> H3PO4 + 5 HCl

**Math**

Solve the following e^-x (square root((3e^2x) - 5/4)) = e^x

**Algebra**

How do I simplify this problem. (2nr - nr^2)r - (2nr - nr^2) . 2r

**physics**

An electron in the cathode ray tube of a tele- vision set enters a region where it acceler- ates uniformly from a speed of 30100 m/s to a speed of 3.82 × 106 m/s in a distance of 2.97 cm. What is its acceleration? Answer in units of m/s2

**Algebra**

Adding and subtracting polynomials. Can someone help me solve this problem? 5x^3 . 2x^2 - 10x^4 + 3x^5 + 3x .(-2)x^4 . = The dot means to multiply. Thank you.

**physics**

An electron, starting from rest and moving with a constant acceleration, travels 5.8 cm in 14 ms. What is the magnitude of this acceleration? Answer in units of km/s2

**Algebra 1**

Adding and subtracting polynomials. (6-t-t^4) + (9t+t^4) How do you solve this problem?

**Math**

I already know the angle of Eastdale which is 45° due to the turn from due east to the northwest. So therefore so I need to find the measures of angle c and angle n. I can use the Law of Sines. sin‹C/c=sin‹E/e sin‹C/18=(√2/2)/12.7308 sin‹C=18(&#...

**English**

What rites of passage do individuals confront in the selection my brothers keeper?

**Math**

Why would you use square roots in the following question: Chang is participating in a charity bicycle road race. The route starts at Centreville and travels east for 13 km to Eastdale. He then makes a 135° turn and heads northwest for another 18 km, arriving at Northcote. ...

**Math**

State the side length of a square with an area of 27 cm2 in simplified radical form.

**Math**

What is ^4 square root 1280r^8 t^12 in simplified form?

**Math**

3

**kindergarden Math**

sally has six flowers. three of the flower are yellow. the rest are red. how many are yellow?

**Math**

sally has six flowers. three of the flower are yellow. the rest are red. how many are yellow?

**Math**

sally has six flowers. three of the flower are yellow. the rest are red. how many are yellow? -kindergarden

**Math**

What is the vertex of y=7(x+5)^2+4?

**physics**

i need more information

**math**

The school cafeteria serves pizza every 6th day and applesauce every day Thursday supposed to pizza and applesauce are both on today's menu in how many days will they be together on the menu again?

**Chemistry**

Since a hydrogen atom consists of just one proton and one electron, it should have a mass of 1.673 x 10^-24 g. And so it does. Calculate how many hydrogen atoms you'd have if you had 5.6 g of hydrogen.

**Math**

The sine ratio is positive in the first and what other quadrant?

**Math**

Two wires are connected to a tower at the same point on the tower. Wire 1 makes an angle of 45° with the ground and wire 2 makes an angle of 60° with the ground. b) Which wire is longer? Explain. (2 marks) c) If the point where the two wires connect to the tower is 35 ...

**Math**

The expression cos 60° is equivalent to sin ?

**Analytical Chemistry (Titrations)**

Is molarity also called the concentration of the solution? I got 0.1641 M HCl. Thank you for your help!

**Analytical Chemistry (Titrations)**

I forgot: What is the concentration of the solution?

**Analytical Chemistry (Titrations)**

About 10ml of concentrated HCl was transferred to a 1-L volumetric flash and diluted to mark with distilled water. When this solution was used to titrate a sample of pure sodium carbonate, Na2Co3, weighing 0.3054 gram, it took 35.09 ml to reach the methyl red end point. The ...

**Math**

Which of the following triangles cannot be solved using the sine law? a) angle a= 28 degrees, angle b= 75 degrees, side a= 24 cm b) side a=4 cm , side b= 11 cm c) angle a=28 degrees, angle c= 34 degrees , side b=5 cm d) angle b= 29 degrees, side b=5 cm, side c=18 cm

**physics**

In order to qualify for the finals in a racing event, a race car must achieve an average speed of 276km/h on a track with a total length of 1520m. If a particular car covers the first half of the track at an average speed of 246km/h, what minimum average speed must it have in ...

**physics**

A speedy tortoise can run at 0.08 m/s, and a hare can run 16 times as fast. In a race, they start at the same time, but the hare stops to rest for 2 min, so the tortoise wins by a shells(20cm). How long does the race take? Answer in units of s

**Math**

Solve the following triangle, rounding side lengths to the nearest tenth of a unit and angle measures to the nearest degree. angle a = 153 degrees, b= 5, a=10.5

**Math**

Marco is 350 m due east of the centre of the park. His friend Ray is 350 m due south of the centre of the park. Which is the correct expression for the exact distance between the two boys?

**Math**

The first prize in a lottery is $250 000. Each winner chosen after the first is paid 20% as much as the winner before them. Determine a formula for the sum of n terms of the geometric sequence.

**Math**

For each arithmetic sequence, determine a) the value of t1 and d (2 marks) b) an explicit formula for the general term (2 marks) c) t20 (2 marks) 3a, 3a – 2b, 3a – 4b, 3a – 6b, …

**Algebra 2**

ok I get it. But what's the actual answer

**Algebra 2**

determine all symmetries of the function g(x)=x/x-1

**Algebra**

so you don't know

**Algebra**

Given a point (-2,5), determine a point that satisfies the specified symmetry. 1.)Origin 2.)y-axis 3.)x-axis 4.)y=x

**Math**

Find the value of term 1 given S8 is equal to -3280 and the common ratio is equal to -3?

**Math**

a) the value of t1 and d (2 marks) b) an explicit formula for the general term (2 marks) c) t20 (2 marks) 3a, 3a – 2b, 3a – 4b, 3a – 6b, …

**Math**

b) an explicit formula for the general term (2 marks) c) t20 (2 marks) 7/4, 1, 1-4, -1/2

**Math**

For each arithmetic sequence, determine a) the value of t1 and d (2 marks) b) an explicit formula for the general term (2 marks) c) t20 (2 marks) 7/4, 1, 1/4, -1/2

**Math**

Determine whether each sequence is geometric, arithmetic, or neither. Justify your answer. 1/5, 1/4, 1/3,1/2,1

**Math**

Find the value of term 1 given sum 8= - 3280a and the common ratio = - 3?

**Math**

A Registered Education Savings Plan (RESP) earns interest at a rate of 5% per year, compounded annually. Jasmine’s parents invest $4000 in the account today. a) Determine an explicit formula to represent the value of the investment. (2 marks) b) Use your formula to write ...

**Math**

The first prize in a lottery is $250 000. Each winner chosen after the first is paid 20% as much as the winner before them. b) Determine an explicit formula for the general term. (2 marks) c) Determine a formula for the sum of n terms of the geometric sequence. (2 marks) d) If...

**Math**

If S1 = 0.7 and S2 = 2.1 in a geometric series, determine the sum of the first 12 terms in the series. Be sure to show all of your work.

**Math**

The sum of the first two terms of an arithmetic series is 15 and the sum of the next two terms is 43. What are the first four terms of the series?

**Math**

Etienne owns a small recycling company that picks up empty glass bottles from restaurants. At the first restaurant, he picks up 50 bottles. At each restaurant after this, he picks up 4 more bottles than he picked up at the restaurant before. Assume that this pattern continues...

**Math**

What is the sum of the infinite geometric series 15 + 15(1/3)+ 15(1/3)^2 + 15(1/3)^3?

**Math**

The sum of the geometric series 9 + 45 + 225 + 3 515 625 is ?

**Math**

An explicit formula for the general term for the arithmetic sequence 7/4,1, 1/4, -1/2?

**Math**

The first prize in a lottery is $250 000. Each winner chosen after the first is paid 20% as much as the winner before them. a) Determine t1 and r for the geometric sequence that represents this situation. b) Determine an explicit formula for the general term. c) Determine a ...

**Math**

Consider the arithmetic series 7 + 19 + 31 + 43 + 55 + pr004-1.jpg. a) How many terms are less than 1000? (3 marks - show your work) b) How many terms are less than 2000? (3 marks - show your work)

**Math**

Determine the sum of the infinite geometric series 28 + 14/3 + 7/9 + 7/54 ?

**math**

Suppose someone gives you 8 to 2 odds that you can not roll two even numbers with the roll of two fair dice. This means you win $8 if you succeed and you lose $2 if you fail. What is the expected value of this game to you? Should you expect to win or lose the expected value in...

**Science**

How to spell acnsrl spgei

**Physics 1**

You are to drive to an interview. The interview is at 11:15 a.m. You plan to drive at , so you leave at 8:00 a.m. to allow some extra time. You drive at that speed for the first , but then construction work forces you to slow to for . What would be the least speed needed for ...

**Physics**

A tennis player hits a ball 1.6 m above the ground. The ball leaves the racket with a speed of 12 m/s at an angle 8.0 degrees above the horizontal. The net is a horizontal distance of 7.0 m away from the player and is 1.0 m high. (a.) Does the ball clear the net? Explain how ...

**Physics1**

3, I got it thank you!

**Physics1**

A vector is drawn with its tail at the origin of an xy coordinate system. In which quadrant does the vector point if the angle with respect to the positive direction of an x axis is -135°?

**math**

Find an equation of the line that satisfies the given conditions. Through (−7, −12); perpendicular to the line passing through (−4, 0) and (0, −2)

**Chemistry**

59.0 mL of a 1.60 M solution is diluted to a total volume of 268 mL. A 134-mL portion of that solution is diluted by adding 111 mL of water. What is the final concentration? Assume the volumes are additive.

**Advanced algebra**

In which distributions does the variable, X, have a binomial distribution? (Choose all that are correct) When a 6-sided number cube is rolled 3 times, X is the number of 2s rolled. When a 6-sided number cube is rolled, X is the number of times rolled before a 2 appears. When a...

**Advanced algebra**

In which distributions does the variable, X, have a binomial distribution? (Choose all that are correct) ~When a 6-sided number cube is rolled 3 times, X is the number of 2s rolled. ~When a 6-sided number cube is rolled, X is the number of times rolled before a 2 appears. ~...

**English 10**

What poetic devices were used in the poem "What Was Told, That"? What did these poetic devices do for this poem? Did these devices help create imagery or communicate the author’s feelings? Please and thank you!

**ethics**

B if you're theories and literature anchors on the developmental side of humans A if you're doing research on experimental psych

**algebra**

all real numbers that are greater than -6 but less than 6. i kinda get it but im confused with the symbols(<,>) i don't now which ones greater or which ones less its confusing

**Chemistry**

When a 1.1 gram ice cube is placed into a 10.0 mL graduated cylinder, the level of water inside the graduated cylinder raises 1.20 mL. What is the Density of the ice cube? My Work: Density = 1.1g/10.0 mL + 1.20 mL? my answer came out to be; Density= .0982 g/mL

**Biology**

PCSK9, a protease that regulates the level of LDL receptors, is a new target for lowering circulating levels of LDL. Excess PCSK9 leads to a decrease in LDL receptor levels. Which one of the following tools would you use in mice to model a potential therapy for humans with ...

**Physics**

Did you ever get the correct answer? Im on this right now...