# Posts by JOE

Total # Posts: 2,625

**Algebra**

y varies jointly as X and Z. y=64 when x=4 and z=8. Find y when x=8 and z=6

**Math**

9a to the 4th power squared

**Help me again in stats**

Find the corresponding z-score to the given value and determine whether the value is unusual. A weight of 225 pounds among a population having a mean weight of 161 pounds and a standard deviation of 23.0 pounds.

**Stats in need of help**

Assume that you entered a drawing to win one of 35 movie tickets. If only 650 people enter the drawing, determine the probability of winning (round your answer to three decimal places)

**English**

My mother feels (bad, badly) about what happened. I think that it is bad.

**math **

Macy's Department Stores markup men's cologne 63% on cost for an 8-ounce bottle. A bottle of cologne costs Macy's $23.00. What is the selling price for the 8-ounce bottle? $31.51

**Data**

Of 20 people invited to a pool party, 4 prefer vanilla ice cream, 7 prefer chocolate, and 3 prefer strawberry. The host surveys six of these people at random to determine how much ice cream to buy. a) What is the probability that at least 3 of the people surveyed prefer ...

**Math**

Suppose that the weather forecast calls for a 30% chance of rain on each of the three days of a long weekend. What are the odds in favour of no rain throughout the entire long weekend? Claudia and Ally are the two favourites to win an upcoming golf tournament. If Claudia is ...

**Math**

Calculate the probability that 200 rolls of two dice rolls will include a) more than 30 sums of 5 b) between 30 and 40, inclusive, sums of 5

**Math**

A designer enlarged both the length and the width of a rectangular carpet by 50 percent. The new carpet was too large so the designer was asked to reduce its length and its width by 20 percent. By what percent was the area of the final carpet design greater than the area of ...

**Math**

The list below gives the number of patrons per day over a 30-day period during July at a theatre. 127 126 125 132 128 122 156 172 183 171 160 140 154 160 122 187 185 158 112 145 168 187 117 120 171 171 156 163 168 162 a) Find the mean and standard deviation of these data. b) ...

**Math**

How do I convert improper fractions into decimals?

**Maths **

Given that the line y=mx+c is a tangent to the circle (x-a)^2+(y-b)^2 = r^2 show that: (1-m^2)r^2=(c-b+ma)^2

**Maths**

show that the circles x^2 + y^2 - 10x - 8y + 18 = 0 and x^2 + y^2 - 8y - 4y + 14x = 0 do not intersect

**Spanish 1 b**

please check my answers 2. How do you say one must in Spanish A. Hay que * B. A menudo C. Que más D. Es necesario 5. A person of mixed European and indigenous heritage is commonly to as a____ A. Mixtec B. Mestizo* C. Maya D. Nahuatl 6. Which is not a place in the ...

**math**

a bus driver filled up 7/8 of her fuel tank for a trip. she used 6/7 of the fuel by the end of the trip. the capacity of her tank is 70 gallons. how much fuel did she sue for the trip. express answer a decimal

**Maths**

Please help Trigonometric identities proof (cot^2(x)(sec(x)-1))/1+sin(x)=(sec^2(1-sin(x))/1+sec(x) Many Thanks

**Maths**

Please solve this trigonometric identity proof problem. I have completed 20; this is the hardest one. Many thanks (sin^3(x)-cos^3(x))/sin(x)-cos(x)=1+sin(x)cos(x)

**georgraphy**

Dis dos yo mamas anus

**math**

what is 8,903.045 in 100s place

**Maths**

A monument is to be constructed in the form of a pyramid with base ABC in which AB = AC = 15M and BC = 20m. The vertex,v is 12m vertically above A Calculate the area of triangle VAB Calculate the area of triangle VBC Special bricks for the outer faces are required and 14 ...

**Maths**

An item of jewellery consists of two identical pyramids, PABCD and QABCD, joined at their common rectangular base. AB = 8mm, BC = 12mm and PQ = 30mm. The line pq passes through the centre of the rectangle ABCD. Calculate the area of triangle ABP Calculate the area of triangle ...

**math**

solve for x 4x+5=8+x

**chemistry**

3.05 g hydrated copper sulfate produces 1.94 g of anhydrous salt.Assuming complete removal of all water of crystallisation,determine tha formula of hydrated copper sulfate.

**Physics**

I have this very confusing two part question that i am having trouble understanding. For the first question i first created a free body diagram to show the forces acting on both the boxes. However i am unsure of what to do after this since i don't understand how to use ...

**Math**

8 bags

**Math**

A restaurant uses 80 pounds of potatoes per week. The restaurant owner buys the potatoes in 10-pound bags from a local farmer. How many bags will the owner need to buy this week?

**math**

Hi can someone help me i am takeing a test i am in connexus adamaey i need help on my test

**enviromental chemistry**

If 10 ppm of nitrogen dioxide is present 1000 L of air at a pressure of 1 atm and temperature of 27 °C, what is the amount of ammonia necessary to react?

**Math**

Martin has 12 times as many baseball cards as Josie. Josie has 29 more cards than Kal. How many baseball cards does Martin have?

**Physics**

Im doing an egg car crash project, is there any tips and tricks to protect your egg in a made car?

**Physics**

Two movers are attempting to push a 300kg piece of furniture across the floor. One man pulls horizontally with a force of 45N while the other pulls with 80N at a 25 degree angle. If the crate slides with an acceleration of 9.15m/s^2, what is the frictional force between the ...

**Math**

A shipping box shaped like a rectangular prism has a height of 6ft and a volume of 96ft3, what is the length and width of the base for the box? Show the description whit a grid.

**Math**

if tina deposits $500 into a bank account that earns 4.5% interest compounded continuously, how long will it take for her account to have $2500 in it

**Physics**

A bullet of mass m travelling at speed vo in the direction shohwn above strikes a block of mass M and embeds itself in it. The block is sitting on the edge of a frictionless table of height H and is knocked off of the table by the collision. a) What is the speed vb of the ...

**math**

If i buy an annual coupon bond with a coupon rate of 7% for $875.00. the bond will mature in 10 years to maturity. What rate of return do you expect to earn ?

**math**

The measurements in the list below have a characteristic in common. 6x5 2 miles 6x5 72,000 inches 6x5 3,000 feet Which statement describes the common characteristic? A Each measurement is greater than 4,000 yards. B Each measurement is equivalent 1,760 yards. C Each ...

**Mathmatics**

Prove algebraically that the difference between the square of any two consecutive integers is equal to the sum of these two integers. First number = n Second number = n+1 Square the second number: (?????)^2 Difference between the squares: ????? Sum of the consecutive integers...

**Mathmatics**

Show that the equation 3x^2 - x^3 + 3 = 0 can be rearranged to give: x = 3 + 3 ---- x^2 x^3 = Divide by ? = x = 3 + 3 ---- x^2 Using Xn+1 = 3 + 3 with x0 = 3.2 ---- x^2n find the values of x1 x2 and x3? What to the values of x1 x2 and x3 represent? The represent estimates of a...

**Algebra**

If I were to make an equation so that the left side were reciprocal function and the right side were an absolute value function then the equation would be guaranteed to have at least one solution. Why?

**Algebra**

Ok thanks

**Algebra**

Create an equation where the left side is a cubic function and the right side is a cube root function. Make it so that the equation has exactly one solution.

**Algebra**

Create an equation where the left side is a linear function and the right side is a square root function. Make it so that the equation has exactly two solutions.

**Algebra**

Two graph never intersect. As such, the equation has no solutions. Create an equation where the left side is a linear function and the right side is a square root function. Make it so that the equation has exactly one solution.

**algebra**

what is the solution of the system? Use substitution. 3x-y=-9 4x -y=-4 my answer is (-5,-6) can you please help

**algebra**

(4t)^-2 t^0/t^6 v^-8 = [(4t)^-2][t^0/t^6][v^-8] = [(1/16)(t^-2)][(v^-8)/t^6] = (1/16)(t^-8)(v^-8) = Since t^0 = 1 AND Assuming that the But...Your notation is unclear. You may also write: (4t)^-2 t^0/t^6 v^-8 = [(4t)^-2](t^0)/(t^6 v^-8) = [(1/16)(t^-2)][(v^+8)/t^6] = (1/16)(t...

**math**

2+3 = 5 5+5 = 10 10+7 = 17 3, 5, 7 are the first three prime numbers after [1 and] 2. Let p1 = 3, p2=5, p3=7, etc. It is logical to assume that the next terms in the sequence are 17+11 = 28 28+13 = 41 etc. so that we have 2+p1 = t1 (first term in sequence) t1+p2 = t2 t2+p3 = ...

**Math**

y = -2x + b, b not equal to 4

**english**

I need a Christmas word with all these letters in it RODDNE

**Math**

x - .33x - .50x =3.21 x = 3.21/1.83 x = pocket money

**Fractions**

(3 1/2 mi)×(3/4 cups)/(1/2 mi) = 7/2 × 3/4 × 2/1 = 21/4 cups

**Calculus Help 3 Questions**

Differentiate the given equation to obtain: 2xdx+cos(xy)(xdy + ydx)+6ydy = 0 2xdx+cos(xy)ydx = -cos(xy)xdy-6ydy dy = (2xdx+cos(xy)ydx)/(-cos(xy)x-6y) At (x,y) = (1,1), and dx =0.01 we find: dy = [2×(0.01)+0.01×cos(1)]/[-cos(1) - 6] cos(1) = 0.54 so that dy = .025/-...

**Calculus Help 3 Questions**

Prob. 5: Let base measure b×b Let height = h Vol = h × b^2 = 245 cm^3 Material = 2×b^2 + 4×bh b = sqrt(245/h) Material = 2×(245/h)+4×sqrt(245h) SOLVE: d(Material)/dh = 0 to find h.

**Calculus Help 3 Questions**

EITHER: s' = ds/dt s' = 8t + 4 = speed in ft/sec At t = 0, speed = 4 ft/sec At time t =10, speed = 84 ft/sec Avg Speed = 0.5(84 + 4) = 44 ft/sec OR: At time t = 0, s = 0 ft At time t = 10, s = 440 ft Avg. Speed = 440 ft/10 sec = 44 ft/sec

**Calculus**

Use the form: f'(x^n) = nx^(n-1)

**Physical science**

1.5m/2 = .75m

**Calc**

What is the question?

**Geometry**

Ext.Ang.Bases = 150 Int.Ang.Bases = 180-150 = 30 each For whole triangle: 30+30+x = 180 Int.Ang.Vrtx. = x = 120 Ext.Ang.Vrtx. = 150 Int.Ang.Vrtx. = 180 - 150 = 30 Int.Ang.Bases = 180 - 30 = 150 Base angles are 0.5×150 = 75 each

**Bayes' Theorem**

Please ignore my entry: there is an error in the above calc. that I offered.

**Bayes' Theorem**

Here is my solution: Given probabilities: P(A) = 1/200 = 0.005 P(B) = 199/200 = 0.995 P(B|A) = 0.9 P(B|~A) = 0.1 Infer: P(~B|A) = 0.1 P(~B|~A) = 0.9 Then: a.) Find P(A|B) P(A|B) = P(A)P(B|A) = 0.005×0.9 = 0.0045 rounds ...

**math**

FV = PMT ([1+I]^N - 1)/I FV = future value I = interest N = number of periods PART A: Set FV = $550,000 Set I = 0.048/4 = 0.012 Set N = 35yr×4qtr/yr = 140 qtr PMT = 550,000×I/([1+I]^N - 1) PMT = 550,000×0.012/([1.012]^140-1) = $1,530.55 PART B: $1,530.55 &...

**math**

I agree, unless you also use m = i^2 where i = sqrt(-1) There is no possible solution for m =+1.

**Physics**

Hint: Stress in steel = 40N/1mm^2 Stress in aluminum = 40N/3mm^2 Speed of sound = (stress/density)^1/2 Wavelength × Frequency = Speed Minimum frequency corresponds to a half wavelength in one of the two wires. Find out which wire and use the corresponding frequency.

**Math**

Check your sign error: 21 = x(2x-1)

**Algebra II Honors**

1,000 = (25 + x)(10 + x)

**math**

Hint: Starting equation: x^2 + (y - 5)^2 = [3/4(y - 8)]^2

**Savings**

What instrument are you using: annuity, bonds, savings account? Different instruments earn in different ways.

**Stats: Counting Techniques Fundamental Theorems A**

12!/(3!×9!) + 10!/(3!×7!)

**algebra**

Same caveat as previously: Vertical = +2 Horizontal = +4

**cal**

Int(x^3 + x)dx = (x^4)/4 + (x^2)/2 + c With x = 0, Int = 1 therefore c = 1 The complete antiderivative is: (x^4)/4 + (x^2)/2 + 1 QED

**algebra**

Change that: The horizontal displacement is -5. The qty (X + 5) is the independent variable. X + 5 = 0 when x = -5, hence the "origin" is displaced to the left. In your other problem, the qty (x -4) is the indep. var. x - 4 = 0 when x = +4. If correct, these problems...

**algebra**

If I am correct, the vertical displacement is 3 and the horizontal displacement is 5. Please double check this answer.

**algebra**

(3x-2(2x-3)) = 3x-4x-6 = -x+6 Error is in first step: misapplication of distributive function.

**Algebra 1 Please help**

PART A: f(n) = 8 × (1.05)^n At n = 0 days, the plant was 8 cm high, according to this rule. (Note: 1.05^0 = 1) The difference in growth is: 11.26cm - 8cm = 3.26cm The time taken for this extra growth is found from: 3.26 = 8×(1.05)^n ln(3.26) = ln(8) + n ln(1.05) 1....

**Calculus!! HELP!!**

Prob. 1. Not sure... Prob. 2. The slope of the curve is df/dx = 3x^2. At (x,y) = (2,4), df/dx = 12. The normal line must have slope -1/12, which suggestscanswer b. Prob. 3. Area/Radius = meter^2/meter = meter (Or cm, whatever units your book specifies).

**Physics**

Static friction exists between whatever is rolling and the surface that it is rolling on. Consider a passive tire on the road. The tire would not rotate at all if the friction were zero at the point of contact; it would merely slip along, as when you try to brake on ice. The ...

**English**

Water's Wells's Julius's

**Math**

Ten cuts produce eleven pieces. The two end pieces will only be affected on one end while the interior pieces will be affected on both ends. Without the effect of the blade, the pieces would all be: 16/11 ft = 1.455 ft. The two end pieces will be reduced by half of the blade ...

**Geometry**

Only possible if BC is a perpendicular bisector of AD. But this is not given as part of your problem statement.

**Physics**

Let s = rate of rotation Let r = radius of earth = 6,400km Then solving (s^2) r = g will give the desired rate, from which length of day is inferred. People would not be thrown off. They would simply move eastward in a straight line while the curved surface of earth fell away ...

**Finite Math**

A=infected ~A=not infected (+)=positive diagnosis (-)= negative diagnosis We seek P(~A|(-)) We are given: P(A) = 1/500 = 0.002 P((+)|A) = 0.9 P((+)|~A) = 0.1 We infer P(~A) = 1 - P(A) = 499/500 = 0.998 and that P((-)|~A) = 1 - P((+)|~A) = 0.9 We now find that: P(~A|(-)) = P(~A...

**MATH**

Let x = cost truck Let y = cost motorcycle Then (1/3)x - y = 200 And x + 3y = 35,400 Solving simultaneously: x = $18,000 Y = $5,800

**precalculus**

For n odd, the sign of the y-ters differ: (+) for the first expansion, (-) for the second. (For n even, the signs are the same.)

**Math**

Future value = Principle × e^(interest rate × time) = 16,000 = 8,000e^(0.07t) 2 = e^(0.07t) ln (2) = 0.07t 0.693 = 0.07t t = 0.693/0.07 = 9.90 years which rounds to 10 years. QED

**Math**

How long is the drawn line in inches? If the length of the line in inches is s, and x is the corresponding distance in miles, then: 1/50 = s/x.

**math**

Oops, my diagram didn't transmit as I had hoped...sorry. Joe

**math**

B is at (-3,4). Let the "?" represent the origin on the diagrwm below. B | |y=4 | x=3 |_ _ _?_ _ _ X = -3 | |y = -4 | | A

**Engineering Mathematics-I**

The given curves are: y=2x^2 and y=2x^(1/2) The desired area lies between x=0 and x=1 The differential area is: [2x^(1/2) - 2x^2]dx The integral has limits: x = 0, x = 1. The result of integration is: Area = 2/3. QED

**Algebra**

Let n = number of rocks in bag. The clues suggest: n + 100,000,000 = 36 + 10,000n - 5n. Solving for n gives: n = 10,006 rocks. Those rocks must be pretty small, or the bag pretty big!

**Algebra 1- Urgent**

PART A: 1. The curve of cost vs time is concave down. 2. This suggests a power curve of the form: a(time)^n = rent, where a and n are to be determined. 3. Write: at^n = r 4. Take nstural logarthm of both sides: ln(a) ÷ n[ln(t)] = ln(r) 5. Use given data: r = 225 when t...

**Maths**

Please check problem statement and repost.

**Sets**

Sets A and B have 13 elements in common. The total of their union is 107. But this 107 only accounts once for the 13 elements in common. Thus, the two sets actually possess a total of 107 + 13 = 120 elements between them. Finally, 120 - 69 = 51. The number of elements in set B...

**Maths fractions**

(41/2)x = 111/4 Write: x = (2/41)×(111/4) = 111/82 Proof: Given: (41/2)x = 111/4 Multiply both sides by 2/41: (2/41)×(41/2)x = (2/41)(111/4) Note: (2/41)×(41/2) = 1 Note: (2/41)×(111/4) = 111/(41×2) Therefore: 1×x = x = 111/(41×2) x = ...

**math**

(4b^6)/9 = [(2b^3)/3]^2

**physical science**

99gm/22cm^3 = 99/22 gm/cm^3 = 4.5 gm/cm^3 (Don't forget the units!) Density is mass divided by volume.

**math**

v cannot equal 4 when t = 1. When t = 1: v = t^2 - 2t + 1 = 1 - 2 + 1 = 0. Please check the problem statement.

**Math**

It is found that the number of raisins in a box of a popular cereal is normally distributed, with a mean of 133 raisins per box and a standard deviation of 10 raisins. My cereal box has 147 raisins. What is the z-score for this box of cereal?

**Math**

In a study of 800 men,diastolic blood pressure was found to be approximately normally distributed, with a mean of 84 millimeters (mm) of mercury and standard deviation of 10 millimeters. Use the 68-95-99.7% rule to determine what percentage of the test group had a diastolic ...

**Chemistry**

How much Zn is mixed with 2HCl = ZnCl + H2 ?

**algebra**

Solve the problem. The pressure of a gas varies jointly as the amount of the gas (measured in moles) and the temperature and inversely as the volume of the gas. If the pressure is 1170 (kiloPascals) when the number of moles is 6, the temperature is 260 kelvin , and the volume...