Friday

December 9, 2016
Total # Posts: 68

**math**

Equation: x^2+y^2 =2x +4y. Given that dy/dt =6, ﬁnd dx/dt when (x,y) = (1+√2,2+√3).

*October 30, 2016*

**math**

lim x→0 of [2-cos3x-cos4x]/(x)

*October 15, 2016*

**math**

lim x→0 of [tan(3x^2) + sin^2(5x)] / (x^2)

*October 15, 2016*

**math**

Find a value of the constant k, if possible, that will make the function continuous for all values of x. f(x)=9-x^2 if x >= 0, f(x)=k/x^2 x < 0

*October 3, 2016*

**math**

A salesman may draw a fixed salary of $10000 per month and a 2% commission sales or he can draw a fixed salary of $4000 per month and a 12% commission on sales.what volume of sales would he earn him the same amount of money in both rates??pls explain the answer

*July 17, 2016*

**math**

A trained bulldog can run for 5 hours at a rate of 20 mph while it can run for for only 2 hours at a speed of 25 mph.the distance covered by running at the slower speed is what percent more than the distance covered by running at the faster speed?

*July 17, 2016*

**math**

what is the acute angle between the hands of hour and minute at 6:25?

*July 6, 2016*

**math**

three right angles have vertices at the center of the circle .if the radius of the circle is 8,what is the combined area of the shaded region?

*July 6, 2016*

**math**

what is the acute angle between the hands of hour and minute?

*July 6, 2016*

**math**

if the side of a square is increased by 150 percent.by what percent does the area increase?

*July 4, 2016*

**math**

What is the greatest number of rectangles with integer side lengths and perimeter 10 that can be cut from a piece of paper with width 24 and length 60?

*July 4, 2016*

**math**

A store usuall sells a certain item at 40%profit. One week the store has a sale, during which the item is sold for 10% less than the usual price. During the sale, what is the percent profit of the sotre makes on each of these items. A. 4% b. 14% C. 26% D. 30% E. 36%

*June 28, 2016*

**math**

if the taxi fare is c cents for the first quarter mile and s cent for each additional quarter mile ,what is the charge ,in cents ,for a trip of x miles,where x is greater than!?

*June 28, 2016*

**math**

if #x=x^2-x for all whole numbers then #(#3)=?

*June 24, 2016*

**math**

In a course a student's final exam is weighted twice as heavily as his mid term exam.if a student receives a score of 84 on his final exam 90 on his midterm,what is the average for the course? as final exam is weighted twice then 84*2=168 then 168+90=258 the average 258/3=...

*June 10, 2016*

**math**

In a course a student's final exam is weighted as heavily as his mid term exam.if a student receives a score of 84 on his final exam 90 on his midterm,what is the average for the course?

*June 10, 2016*

**Math**

Let f(x)=x+1‾‾‾‾‾√ and g(x)=3x−5. Find f∘g and g∘f, and their respective domains. 1. (f∘g)(x)= 2. What is the domain of f∘g ? Answer (in interval notation): 3. (g∘f)(x)= 4. What is the domain of g∘f...

*March 1, 2016*

**math**

A plane leaves Chicago headed for Los Angeles at 520 mph. One hour later, a second plane leaves Los Angeles headed for Chicago at 620 mph. If the air route from Chicago to Los Angeles is 1800 miles, how long will it take (after the first plane takes off) for the first plane to...

*September 11, 2014*

**math**

A motorboat left a harbor and traveled to an island at an average rate of 11 knots. The average speed on the return trip was 10 knots. If the total trip took 4.2 hours, how far is the harbor from the island?

*September 11, 2014*

**math**

Running at an average rate of 4 meters per second, a sprinter ran to the end of a track. The sprinter then jogged back to the starting point at an average rate of 2 meters per second. The total time for the sprint and the jog back was 2 minutes 6 seconds. Find the length of ...

*September 11, 2014*

**math**

An investment adviser invested $14,000 in two accounts. One investment earned 4% annual simple interest, and the other investment earned 2.5% annual simple interest. The amount of interest earned for 1 year was $458. How much was invested in each account

*September 11, 2014*

**math**

What is 1/8 written as another fraction

*February 25, 2014*

**chemistry**

How much heat in joules is required to heat a 44g sample of aluminum from 76 F to 148 F?

*February 26, 2013*

**Math**

a certain state's lottery game, lotto, is set up so that each player pays $1 per ticket and chooses six different numbers from 1 to 49. if the six numbers chosen match the six numbers drawn each Saturday evening, the player wins the top cash prize. the order in which the ...

*November 7, 2012*

**Chemistry**

A 0.105-L sample of an unknown HNO3 solution required 36.9 mL of 0.200 M Ba(OH)2 for complete neutralization. What was the concentration of the HNO3 solution?

*October 14, 2012*

**Chemistry**

What is the concentration of a solution made by diluting 95 mL of 6.0 M HCl to a final volume of 750 mL

*October 14, 2012*

**arithmetic**

write 14 over 4000 as a decimal

*January 29, 2012*

**calculus **

I got it thank you so much it makes much more sense when you help me.

*June 28, 2011*

**calculus **

but what would y be?

*June 28, 2011*

**calculus **

The point of inflection for graph x^3/3-x^2-3x+7 I cannot seem to find it as stated.

*June 28, 2011*

**Algebraic Expressions**

2 / (x-1)^3 + 3 / (x-1)^2 + 4 / x-1 Two of us get 4x^2 - 5x + 3 / (x-1)^3 The book gives 4x^2 - 5x + 3 / (x-1)^3 Can anyone help with this one.

*April 30, 2011*

**Algebra**

(55x2)/t

*April 27, 2011*

**Algebra**

I forgot to put the x after the 45. And I don't understand what you mean. Sorry. 45x ÷ 6t x 11x Note: I am studying to get my GED's so I can go back to school. I never touched on any of this.

*April 27, 2011*

**Algebra**

45 ÷ 6t x 11x I have already posted this question and received an answer. However, brackets weren't used and so still seeking understanding. I was trying to divide 6 into 45 then multiply 11x, but it isn't working out as the book answers. Once again, thank you ...

*April 27, 2011*

**Algebra**

it isn't in brackets. 45 ÷ 6t x 11x Thank you so much for your help.

*April 27, 2011*

**Algebra**

I am working out of Mathematics Made Simple. I find it very hard to learn from, however, is the only book I have.

*April 27, 2011*

**Algebra**

would you be able to explain how this is worked out?

*April 27, 2011*

**Algebra**

45x divided by 6t x 11x I have tried to work this out, however, do not understand it at all. The book gives an answer of (55x squared)t. Can anyone explain this to me? Thank you

*April 27, 2011*

**Algebra**

(12x + 5t)-(14t-6x) 12x + 5t - 14t -6x ( I get lost here when the -6x changes to +6. Same as this question: (5x + 2z)-(2x - 11z) Can anyone explain this to me? Thank you

*April 25, 2011*

**ratios**

The book I am learning from gives an answer of 750 pounds. I am working out of Mathematics Made Simple fifth edition. It doesn't show the work. It shows me one way of doing certain problems and then changes. frusterating? Thank you for your help.

*April 21, 2011*

**ratios**

Martha is flying to England for a visit. She intends to exchange her U.S. dollars for English pounds. The exchange rate allows 60 pounds for every 100 U.S. dollars. How many pounds will she get if she exchanges $450 U.S. dollars for pounds? 60:x = 100:450 ( this is how I was ...

*April 21, 2011*

**Percentage Problems**

I figured it out. I converted .95 to a fraction. :)

*April 21, 2011*

**Percentage Problems**

Find 1/2 of 1% of 190. 190 x .01 = 1.9 1.9/2 = .95 This is what I have been doing. However, the answer is 19/20 and there isn't any explantion. Can anyone help me out with this? Thank you in advanced

*April 21, 2011*

**word problem**

It only says a metal frame. Thank you so much for helping me with this so quickly. :)

*April 20, 2011*

**word problem**

james has a metal frame with an 8.32 inch perimeter. If the sides are 0.04 inches thick, what is the perimeter of the inside of the frame? 0.04 x 4 + .16 8.32 - .16 = 8.16 But the book gives an answer of 8. I am not sure what I am doing wrong. Can any one help me out. The book...

*April 20, 2011*

**math**

A British company is sending you measurements for a table to build in your factory. The table top must be 50 cm × 75 cm. Your machine calibrates in inches. Find the size of the table in inches. (1 cm = .39 in)

*March 15, 2011*

**physic**

a. is 34.6 so would b) be v=34.6-(9.8)(4.2)

*February 23, 2011*

**physic**

A dynamite blast at a quarry launches a rock straight upward, and 2.0 s later it is rising at a rate of 15 m/s. Assuming air resistance has no effect on the rock, calculate its speed (a) at launch and (b)4.2 s after launch

*February 23, 2011*

**physics**

A Boeing 747 "Jumbo Jet" has a length of 59.7 m. The runway on which the plane lands intersects another runway. The width of the intersection is 21.3 m. The plane decelerates through the intersection at a rate of 5.33 m/s2 and clears it with a final speed of 38.3 m/s...

*February 23, 2011*

**physics**

A speedboat starts from rest and accelerates at +1.69 m/s2 for 7.18 s. At the end of this time, the boat continues for an additional 4.55 s with an acceleration of +0.468 m/s2. Following this, the boat accelerates at -0.657 m/s2 for 8.38 s. (a) What is the velocity of the boat...

*February 23, 2011*

**physics**

A diver runs horizontally with a speed of 0.759 m/s off a platform that is 10.0 m above the water. What is his speed just before striking the water

*February 23, 2011*

**Algebra**

How many solutions are there to the equation -0.3x^2+25x+16=0, how would you come to this conclusion?

*February 13, 2011*

**physics**

no im not using two different names..

*February 10, 2011*

**physics**

An airplane is flying with a velocity of 240 m/s at an angle of 30.0° with the horizontal, as the drawing shows. When the altitude of the plane is 2.4 km, a flare is released from the plane. The flare hits the target on the ground. What is the angle è?

*February 10, 2011*

**physics**

what would be the smaller angle because 89.76 is the larger angle

*February 10, 2011*

**physics**

a rifle that has been ‘sighted in' for a 91.4-meter target. If the muzzle speed of the bullet is v0 = 328 m/s, there are the two possible angles è1 and è2 between the rifle barrel and the horizontal such that the bullet will hit the target. One of these ...

*February 10, 2011*

**physics**

Suppose that you loft the ball with an initial speed of 15.0 m/s at an angle of 50.0° the horizontal. At this instant your opponent is 10.0 m away from the ball. He begins moving away from you 0.38 s later, hoping to reach the ball and hit it back at the moment that it is ...

*February 10, 2011*

**physics**

An airplane with a speed of 94.9 m/s is climbing upward at an angle of 63.2 ° with respect to the horizontal. When the plane's altitude is 743 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...

*February 10, 2011*

**physics**

A diver runs horizontally with a speed of 0.759 m/s off a platform that is 10.0 m above the water. What is his speed just before striking the water?

*February 10, 2011*

**physics**

i ask my teacher he said it wasn't right

*February 10, 2011*

**Math**

The number of tickets sold each day for an upcoming performance is given by N(x)=-0.5x^2+12x+13, where x is the number of days since the performance was first announced. When will daily ticket sales peak and how many tickets will be sold that day?

*February 10, 2011*

**poetry**

Hopkins's use of "seared," "bleared," and "smeared" is an example of

*June 29, 2008*

**English**

later and then are what part of speech

*April 20, 2008*

**American History**

Explain the politics of consensus

*April 18, 2008*

**please help!!!!!**

I need current human rights issues in Canada... and google doesnt help me!! Does anybody have any suggestions? Thank you for using the Jiskha Homework Help Forum. Reuter's always has news from every country. Here are some to try: 1. http://news.yahoo.com/s/nm/20070304/...

*March 24, 2007*

**Biology**

In this statement, "Some drugs can be used as muscle relaxants" Identify the neurotransmitters involved and what the drugs are doing at a biological level. Thank you! yea it is

*March 20, 2007*

**spelling**

thanks for the help i just had the spelling sheet now

*January 16, 2007*

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