# Posts by Joe

Total # Posts: 2,604

**chemistry**

If 51J of heat is added to an aluminum can with a mass of 23.0g , what is its temperature change? Specific heat capacity of aluminum is 0.903 J/g∘C.

**chemistry**

If 51J of heat is added to an aluminum can with a mass of 23.0g , what is its temperature change? Specific heat capacity of aluminum is 0.903 J/g∘C.

**physics**

Find the area of a rectangle whose sides are 12.68 cm and 98.5 mm.

**math**

containers of sides are on sale. You can get 2 containers for $3.00 and 1 for $1.95. Determine the cost of three containers of sides.

**Math**

111

**algebra2 honors**

d9t0

**chemistry**

What is the density of a cube that has a mass of 134 g and the side of the cube measures 2.75

**math**

Members of the West High School Band were hard at work practicing for the annual Homecoming Parade. First, they tried marching in rows of 12, but himself to bring up the rear left Andrew. Then the director told the band members to march in columns of eight, but Andrew was ...

**marketing**

Michael Soles--owner of Soles Shoe Store--recently discovered that shoe stores in his trading area have an average markup of 40%. Upon investigation, Michael found that his average markup is $15 on shoes that he sells for $45. This suggests that:

**math**

from a standard 52 card deck, how many 7 card hands have exactly 5 spades and 2 hearts?

**math**

From a standard 52 card deck, how many 5 card hands will have 2 clubs and 3 hearts?

**Physics**

IF YOU ADD THEM ALL UP AND DIVIDE BY 69 UR ANSWER IS STILL WRONG LOL

**chem**

The speed of your ship in still water is 20 knots.Your ship traveled 70 miles downward in channel in the same amount of time it traveled 45 miles upward the channel.Calculate the rate of the channel current.

**Math**

Define a variable, and write an equation. If x is the number of candy bars that Jason started with, x - (1/3)x - 3 = (11/30)x is an equation that can be solved to find the solution.

**algebra**

Difference of two squares: Example: x^2 - 9 factors to (x+3)(x-3) Perfect squares: x^2 + 6x + 9 = (x+3)(x+3) x^2 -6x + 9 = (x-3)(x-3) Cubes: x^3 - 27 factors to (x-3)(x^2 +3x +9) x^3 + 27 factors to (x+3)(x^2 -3x +9) Can you see the pattern?

**Statistics**

This is definitly an error because Ho was rejected when it was true. Google Type I and Type II errors and you will find the definition of each and then you will be able to figure out which error happened here.

**Math**

To find the range, substitute the values from the domain. Example: y = -3x + 4 y = -3(-3) + 4 = 9 + 4 = 13 y = -3(-2) + 4 = 6 + 4 = 10 So, we are finding the range of 13 and 10 s0 far

**Statistics**

You want to use a two-tailed t-test. You do not want to use matched pairs. books set things up differently, but here is one way to do it.. group 1 = dog owners group 2 = no dog Ho: mu1 - mu2 = 0 Ha: mu1 - mu2 does not = 0 If you are allowed to use a statistics calculator (like...

**math compound interest**

Suppose you put in a savings account at an APR of 6% compounded monthly. Fill in the table below rounding your answers to the nearest cent. (Calculate the interest and compound it by hand each month rather than using the compound interest formula.)

**Trignometry**

use the law of cosines to start and find side c. Then use the law of sines to find remaining angles.

**physics**

A 3 N weight slides down a ramp made of sandpaper. The coefficient of friction is 0.8, and the ramp is at an angle of 50° to the horizontal. How could you calculate the magnitude of the friction force? A. 3 N × sin(50°) B. 3 N × 0.8 × 50° C. 3 N &...

**Calculus**

a = 14, b = 21

**Math 6th Grade Level**

If he used 100 bags of the flour, this means he used 1/2 of the flour (100 is 1/2 of 200). So, 1/2 of 680000 is 340000 oz that were left. Therefore, he had 340000/5000 bags (you can do the math).

**pre-cal**

The 3-point line in basketball is 23 ft 9 in away from the point on the floor vertically below the center of an 18-in diameter rim. The rim is 10 ft above the floor. Kim shoots a three pointer using a 9-in diameter ball from the 3-point line that just clears the basket. The ...

**math**

-23/21

**Math for Educators**

The first ones are correct. Does it matter what base your solution is for the last one?

**Math for Educators**

The statement, "when I divide them by 2, there is a remainder of 1" means that the numbers must be odd, therefore they can't end in a 0. I'm only seeing 2 answers, 25 and 85

**math**

v(x) = 30000-1000x v(7) = 30000-1000(7) = $23000

**Calculus**

The slopes of the tangent lines are equal to the derivative of the parabola at the points. y ' = 2x, so y'(a) = 2a and y'(-a) = -2a. You can also use the slope formula m = (y2-y1)/(x2-x1) to find the slopes of the tangent lines. Therefore m = (a^2+3-(-6))/(a-0)=(a^...

**Calculus**

if p(2) = 6, substituting in the p(x) function, 6 = 4a + 2b + c p ' (x) = 2ax + b, therefore if p ' (2) = 2, this means that 2 = 4a + b p '' (x) = 2ax + b, therefore if p '' (2) = 3, this means that 3 = 2a and a = 3/2 substituting 3/2 for a in 2 = 4a + ...

**Physics**

Thanks!

**Physics**

A trapeze artist swings from one 35-ft long trapeze to another trapeze. She releases one trapeze at a 30 degree angle relative to the vertical. She flies through the air, catching the other trapeze 18 ft away at the same elevation. What was her release velocity?

**Algebra**

3x^2(2x^2 - 7x - 4) =3x^2(2x+1)(x-4)

**Government**

coaliation

**rochester**

A 3kg stone falls from rest a top a cliff, hitting the ground traveling 42m/s. How much force does it do on the ground below if that ground is compressed 0.30 meters? (w= F*d=KE-PE)

**english**

plz give me solutions of 10 class bbc compehensions answers

**Finance**

0.98

**math**

SOLVE FOR P, Q, &R p + 1/(Q+ 1/R)= 25

**math**

SOLVE FOR P, Q, &R

**Math**

5

**chemistry**

explain why a balloon with 1.00 mol xe gas in it has the same volume as balloon with 1.00 mol he gas in it

**physics**

How long does it take light to travel through a 2.7 mm-thick piece of window glass?

**algebra!!!! please help me!!!!**

This is a Brilliant question. Please do not answer.

**Algebra**

Prove by mathematical induction that 3^(3n+1) + 2^(n+1) is divisible by 5

**Geometry**

Lines p and q are parallel and are intersected by transversal r. If angle 1 = 4x degress and angle 2 = 2x+24 degrees, what is the measure of angle 2?

**American Government**

Proportional representation systems like those in Western Europe encourage the formation of smaller parties by enabling parties to: A. win legislative seats even though they do not receive a majority of votes in elections. B. receive campaign funds from government in ...

**chemistry**

im so confused about this question Calculate the pH of a solution that has [H3O+] = 5.5 x 10-3.

**math**

mrs nelson has a rectangular flower box that is 5 feet long & 2 feet tall. she wants the width ofn the box to be no more than 5 feet. if the width is a whole number, what vare the possible volumes for the flower box?

**algebra**

A student traveled 206 km in 16 days. At the same ratio, how far would the student travel in 64 days?

**Math**

A gardener is installing a circular garden. The radius of the circle 28 feet. He needs to know the circumference in order to buy materials for the edging. What is the circumference if he uses = . The circumference is __ feet

**Math**

A lot is in the shape of a trapezoid. The sum of the bases is 180 feet. If the area of the lot is 8,100 square feet, what is the distance across the lot, i.e. the altitude of the figure? The altitude of the trapezoid is __ feet.

**trignometry**

If it helps the answer according to this ACT compass sample test questions print out is 6.93. How to solve it is the question ... C is a 90 degree angle. AB is 8 and the hypotenuse. AC is the base .... we don't know it's length. It's on page 14 if you google this...

**chemistry**

platinum metal currently costs $1700 per troy ounce ( note: this is different than a regular ounce 1 troy ounce =31.1035 g. what would the costs be, in dollars , to purchase enough platinum to form a solid cone with maximum radius 0.750 m ?

**chemistry**

A sample of copper metal containing 7.738*10^24 atoms is drawn into a cylindrical wire with radius r = 0.625 mm . How long must the wire be in meters?

**Math**

Compute the number of vinyl tiles, measuring 25 cm each side, needed to tile a kitchen measuring 102 ft. by 18 ft.

**Math**

Write 70,633.29 two other ways.

**Chemistry**

What [PB2+] should be maintained in Pb(NO3) to produce solubility of 1.0*10^-4 mol PbI2/L when PbI2 (s) is added? Ksp for PbI2 is 7.1*10^-9 I can't figure it out...

**Science-Chemistry**

Methyl amine is a weak base with a pKb=3.35. Consider the titration of 30.0mL of .030M of Methyl amine with 0.025M HCl. a) Write the appropriate equation for the reaction. b) Calculate K for the reaction in part (a). c) Calculate pH of the initial methyl amine solution (0mL ...

**math**

I cant really trust you i need more profe

**Physics**

A singly charged positive ion has a mass of 2.74 10-26 kg. After being accelerated through a potential difference of 268 V, the ion enters a magnetic field of 0.450 T, in a direction perpendicular to the field. Calculate the radius of the ion's path in the field. cm

**Math**

Remy can chop 5 carrots in 3 minutes. How long will it take him to chop 120 carrots?

**Algebra**

simplify and write in standard form (2p^2-p)+(7p^4+P^3+2p)

**Chemistry**

What volume of H2(g), stored at 26°C at a pressure of 141 atm, would be needed to run an electric motor drawing a current of 8.4 A for 4.8 h?

**math**

Marty walks to school 4 days each week. The walk talks 15 minutes. How much time does it take marty to walk to school & home each week. Is this correct? 15×4=60 it takes him an hour each week

**Physics**

An object that is 32 cm in front of a convex mirror has an image located 17 cm behind the mirror. How far behind the mirror is the image located when the object is 24 cm in front of the mirror?

**Physics**

An object is placed in front of a convex mirror with radius of curvature = 17 cm. The object's height is 3.5 cm and it is initially 25 cm in front of the mirror. Find the (a) location and (b) height of the image. Next the object moves closer to the mirror, so the object ...

**Math**

Kurt cut pizzas into wedges measuring 40 degrees. If each person eats one piece of pizza How many people could he feed with 2 pizzas

**General Chemistry II**

Also, not sure if I did this correctly: Compute the solubility in moles/ liter for each sample titrated. 2.3 g KHTar in water. 2.3/18= .128 S= (.128/0.05)= 2.56 moles/ liter Is this correct?

**General Chemistry II**

Why is the Ksp value larger for NaNO3 and KNO3 than water?

**SS Please check answers**

your not helping at all

**Mathematics**

System 5x+8y+6z=14 2x+5y+z=12 -3x+6y-12z=20

**Chemistry**

12

**Math**

pie chart

**chemistry**

3.61*10^-9

**geometry**

In the diagram, circle A is tangent to circle C, and segment BE is tangent to circle A. The radius of circle A is 11 meters and the radius of circle C is 8 meters. Find the area of triangle ABE to the nearest square meter.

**math**

What is the value of t in the solution to this systems of linear equations? 2s – 3t = –1 3s – 4t = 0 a)–5 b)3 c)-7/3 d)4

**math**

i got 8s-12t=-1 and 9s-12t=0 i don't get how you subtract this?

**math**

how do you subtract this?

**math**

What is the value of u in the following system of linear equations? 4u + 3v = –1 3u + 2v = 1 a) 5 b)-11/2 C)-7 d)19/3

**math**

Look at the revenue for videos rented (v) on a given day at two different video rental stores below r = 2v + 10 r = 1.6v + 18 After how many video rentals will the revenues of both stores be equal? a)25 b)45 c)70 d)20

**Chemistry**

Na2SO4 solution is slowly added to a solution which contains .10 M Ba (2+) and .1 M Pb(2+). which of the following statements descrives the result of the addition of Na2SO4

**Math**

the perimeter of a rectangular field is 140m. If the length is increased by 15m and breadth is decrease by 5m, the length will become 3 times the breadth. Find the length of breadth of the field.

**math**

the ages of a son and father are in the ratio 3:8. if the son is 35 years younger than his father. find their ages.

**physics**

vdf

**Chemistry**

you're the best! thank you!!

**Chemistry**

The Ka of a monoprotic weak acid is 8.11 x 10 ^ -3. What is the percent ionization of a 0.125M solution of this acid?

**Chemistry**

Assuming complete dissociation, what is the pH of a 2.55 mg/L Ba(OH)2 solution?

**Language Arts**

Or C

**Language Arts**

Oh OK I was asking it for homework help and it was an abcd question. I'm thinking it might be D then

**Language Arts**

Help Ms. Sue! Please check if I'm correct on this question. * Which of the sentences below is the best option for a thesis statement? A.) An after-school program at the community center might involve classes, sports, and other activities in which children can take part. B...

**Physics**

A 50.0-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 20.7° below the horizontal is applied to the box. The coefficient of kinetic friction between the box and the surface is 0.300. What is the acceleration of the box?

**Science (physics)**

A particle P is launched from a point O with an initial velocity of 60m/s at an angle of 30 degrees to the horizontal. At the same time, a second particle Q is projected in the opposite direction with initial speed of 50m/s from a point level with point O and 100m from O. You ...

**Algebra**

3 real numbers that form a geometric progression have sum equal to 175 and product equal to 17576. What is the sum of the largest and smallest numbers?

**Trigonometry**

I think I did use the sine law but I am just not sure how to get a+b?

**Trigonometry**

I calculated it and a got a totally different answer

**Trigonometry**

Let N be a 5-digit palindrome. The probability that N is divisible by 4 can be expressed as \frac{a}{b}, where a and b are coprime positive integers. What is the value of a+b?

**Chemistry**

I keep getting 5.17 pH. but that's wrong. do I use the equilibrium values to plug into the equation?

**Chemistry**

Calculate the pH at the equivalence point for the titration of 0.130M methalamine (CH3NH2) with 0.13M Hcl. The Kb of methyl amine is 5.0x10-4.

**Education**

1. in a study examining preschoolers' responses to their peers distress, researchers used ___ to record each instance in which a child cried, followed by other children's reactions. a. time sampling b. systematic collection c. event sampling d. structured observation 2...

**Math**

If someone is attached to a 20 ft rope, which is attached to the corner of a building, how far can they move? If the bulding is 22 ft X 15 ft?