# Posts by mark

Total # Posts: 1,630

**Algebra**

Some functions that aren't invertible can be made invertible by restricting their domains. For example, the function x^2 is invertible if we restrict x to the interval [0,inf), or to any subset of that interval. In that case, the inverse function is \sqrt x. (We could also...

**Geometry**

The length of a rectangle is 3x+10 feet and its width is x+12 feet. If the perimeter of the rectangle is 76 feet, how many square feet are in the area of the rectangle?

**physics**

A 4 kg projectile has 1400 J of kinetic energy when it leaves the ground. If it has 120 J of kinetic energy at its highest point, how high did it travel?

**Stats**

A random sample obtained from a population has a mean of µ=100 and a standard deviation of ó = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean for a sample of n...

**Art**

@Reed, I have this question, it's not monet, it's manet.

**Statistics**

what is the cost of a dinner when there is a 0 rating when y hat=1.6+2.9x

**Chem**

Using the Absorbance (0.455) of your Unknown SCN- solution and the slope (3163.9) from your Calibration Curve, calculate the concentration of SCN- in the solution created from 5.0 mL 0.200 M Fe(NO3)3, 40.0 mL H2O and 5.0 mL SCN-. How would I calculate?

**Math**

12

**physics**

using the formula s=(v+u)/2 ×t given that v=108km/h=108×1000/3600 =30m/s uniform velocity v=u s=(30+30)/2×30 s=900m or 0.9km

**Physics**

62m of skid marks and coefficient of .75, how fast was the car going?

**calculus 3**

A golf ball is driven down a horizontal fairway with an initial speed of 55m/s at an initial angle of 25 degrees. (Assume the tee from which the ball is hit is of negligible height). a). how far does the ball travel horizontally b). when does the ball land? c). what is the max...

**physics**

A speeder passes a parked police car at a constant speed of 20.1 m/s. At that instant, the police car starts from rest with a uniform acceleration of 2.65 m/s How much time passes before the speeder is overtaken by the police car? Answer in units of s

**math**

What is the area of the largest rectangle with lower base on the x-axis and upper vertices on the curve y = 12 - x^2?

**math**

What are the two positive integers whose sum is 200 and whose product is a maximum?

**math**

Find the absolute maximum of the function f(x)=2x+1, where -2<x<0 (-x^2)+1, where x>0

**math**

Which one of the following statements is true? If f is continuous on (a, b), then f attains an absolute maximum value and f attains an absolute minimum inside the interval (a, b). If f '(x) > 0 on the interval (a, b), then f is decreasing on the interval (a,b) If f and ...

**math**

Find the x-coordinate of the point(s) of inflection on the graph of y = x^3 - 12x^2 - 5.

**physics**

An aircraft has a lift off speed of 130 km/h. What minimum uniform acceleration does this require if the aircraft is to be airborne after a takeoff run of 350 m? Answer in units of m/s2

**Art check please**

Tori is the best

**math**

Charlene is feeling a box planter with soil each bag of soil contains enough to fill 500 cubic inches at the base of the blocks planter is a 9 inch square and the sides are 18 inches tall how many bags of soil for growing need

**english**

Master Cat Once upon a time, the cat (“Meow, meow, meow”) and the lion (“Grrr, grrr, grrr”) were very good friends. They lived together in a cave. The lion was very big but stupid. The cat was the wisest of all animals. He was a teacher of them all. The ...

**Math**

My math problem is combining like terms then simply. 3 3 6b - 2b + 2b + 2b -b Answer is (b)

**Math**

Which of the following ordered pairs is a solution to the inequality y less than or equal to -2x + 8? a. (0, -4)<<<< b. (5, -1) c. (7, 0) d. (9, 1)

**Math-Damon can you help me?**

Do you know what kind of formula I could use to solve this?

**Math-How do I do this problem?**

An inverted conical tank (with vertex down) is 14 feet across the top and 24 feet deep. If water is flowing in at a rate of 12 ft3/min, find the rate of change of the depth of the water when the water is 10 feet deep.

**Statistical Reasoning**

The size of an e-mail file is stated as 210 KB, but the file size is actually 220.5KB. What is the absolute error?

**Sixth Grade Math**

Thank you for explaining.

**Sixth Grade Math**

Leland wants to paint a portrait for his parents using a photograph of them that is 5 inches wide by 8 inches high. He wants the portrait to be proportional to the photograph and 42 inches high. Which proportion can Leland use to find w, the width he needs to use to make the ...

**Math**

__ 0.63 _ 0.63 0.675 _ 0.7 The answer choices have a line above the numbers. I don't understand.

**law**

•What are the similarities and differences in the realities of plea-bargaining between the crime control model and the due process model

**Math**

Find all solutions to the equation sqrt(2-3x)= 9. Express your answer as a common fraction. I squared both sides and I got 4-9z^2=81 and then -9z^2=77 then I divided both sides by -9 and now I am stuck, I know I can square root both sides. But I think something went wrong.

**Math**

The square root of h is greater than 10/3 and less than 24/5. How many integer values of h satisfy this condition? I think the first step would be to square each fraction so 100/9 and 576/25 and then see which whole numbers are between. Am I on the right track?

**math**

The ratio of an object's weight on Earth to its weight on Neptune is 5 : 7. How much would a person who weighs 150 pounds on Earth weigh on Neptune?

**math**

9 of the 30 children in a class had brown eyes what fraction of the children have brown eyes

**chem**

Thank you! Now question 5 makes sense.

**chem**

Ascorbic acid is a diprotic which donates 2 H+. Autocorrect is the worst

**chem**

I meant to say ascorbic acid is a diuretic which donates 2 H+

**chem**

I titrated a 250mg tablet to see if it really had 250mg of scorbutic acid (H2C6O6) a diuretic acid, in it. I took a 250mg tablet, grounded it up and found it took 35.87ml of .0505 M NaOH to neutralize it 1. How many moles of NaOH is it? 35.87ml NaOh(1L/1000ml) (.0505M/1L)= ....

**poetry ! help**

I'm confused on how to write a sonnet poem. ( I searched for some examples but there just way to confusing) any examples? Thanks:)

**Physics**

At the start of a trip, a driver adjusts the absolute pressure in her tires to be 2.84 ✕ 105 Pa when the outdoor temperature is 281 K. At the end of the trip she measures the pressure to be 2.95 ✕ 105 Pa. Ignoring the expansion of the tires, find the air ...

**Math**

Thank You Very Much DonHo

**Math**

If Charlie is 6 1/3 ft tall, Dan is 6 5/12 ft tall and Mark is 6 1/6 ft tall, who is the tallest? I say Dan is the tallest, am I right? Thank You for any help you can give me on this.

**Math**

Thank You

**statistics**

The p value is the: a. probability with which a test statistic would occur if the research hypothesis were true. b. probability with which a test statistic would occur if the null hypothesis were true. c. cutoff probability at which a test statistic is considered extreme. d. ...

**science**

can you tell me the relationship between water treatment and geckos

**Calculus Minima Problems**

row must be sqr rt of (x^2+4); therefore the answer is 2 sqr rt of 3 allover 3 km

**physics**

the volume v of a sphere of radius r is given by v=4/3pie r^3 what is the fractional change in v for a fractional change in r

**6th Grade Math**

Marianne buys 16 bags of potting soil that comes in 5/8 -pound bags. A. How many pounds of potting does Marianne buy? 10 B. If Marianne’s father calls and says he needs 13 pounds of potting soil, will 4 more bags be enough to cover the extra soil needed? Is 10 the correct...

**Solve. W rite each answer in simplest form.**

Thank you Ms. Sue!

**Math**

You complete 3 centimeters on your necklace in an hour. Each hour after the first,you triple the length of the necklace. Write an expression using exponents for the length of the necklace after 3 hours.Then find the length.

**Finance/Economics**

You can invest your money in a taxable corporate bond paying 10% interest or a tax-free municipal bond paying 7% interest. Which would pay the higher after tax interest if you are in the 28% tax bracket?

**ccs trigo**

A pilot is flying at a heading of 96° at 225 miles per hour wind is blowing from the south west at a heading of 37° find the ground speed and courses of the plane

**trig**

bike tires are 22 inches in diameter and has an angular speed of 5 miles per second, how fast is the bike traveling in mph

**trigo**

180

**algebra**

A new cruise ship line has launched 3 new ship: the pacific, the Caribbean and the island. The Caribbean has 37 more deluxe staterooms than the pacific. the island has 38 fewer deluxe staterooms than twice the number of deluxe stateroom on the pacific. Find the number of ...

**Math**

I appreciate your help Bosnian, Thanks.

**Math**

The average price in dollars to rent a studio in Back Bay, Boston, Ma. can be approximated by the equation p=30.2t + 587,where t is the number of years since 1990. Solve this equation for t and use the new equation to determine approximately what year it will be when the ...

**Physics**

an 80kg man jumps off a 60m cliff, halfway to the ground, his GPE is 27,072J. What is his KE at the same moment?

**Lake Arbor Elementary**

Bit tough for 3rd grade homework.

**algerbra 1**

If 5g-4=6+7g, then g=

**please help bio**

R stands for the dominant form of the color blindness allele and r signifies the recessive form. Because Edward is NOT color blind, the allele on his X chromosome must be __________.

**human biology**

If type B blood was accidentally given to someone with Type O blood, a defense response called (A)__________ would occur. This is because the type O person has A and B defensive proteins called (B)__________ that would mount a defense against the type B blood, causing clumping.

**Algebra where did I go wrong**

Here is a web site that can help you wolframalpha

**Algebra where did I go wrong**

I'm pretty sure I'm right I believe the answer is 100

**bio**

If type B blood was accidentally given to someone with Type O blood, a defense response called (A)__________ would occur. This is because the type O person has A and B defensive proteins called (B)__________ that would mount a defense against the type B blood, causing clumping.

**biology**

Human immunodeficiency virus (HIV), the virus that causes AIDS, is unique because its main genetic instructions are in the form of RNA instead of DNA. Because of this, it’s called a(n) (A) __________. When a person is infected with HIV, the immune system mounts a normal ...

**Chemistry**

Ammonia is produced when Nitrogen gas reacts with Hydrogen gas, as shown by the equation below: N2 + 3H2 --> 2NH3 If the percentage yield is 90%, what would be your experimental yield of NH3 if 145.8g of N2 react? 2) 2Mg + O2 --> 2MgO A) If 50g of Mg reacts with 50g of ...

**Chemistry**

Ammonia is produced when Nitrogen gas reacts with Hydrogen gas, as shown by the equation below: N2 + 3H2 --> 2NH3 If the percentage yield is 90%, what would be your experimental yield of NH3 if 145.8g of N2 react? 2) 2Mg + O2 --> 2MgO A) If 50g of Mg reacts with 50g of ...

**Math**

How ugh are monthly payments on 100000 for 36 mo, at 9% ?

**Statistics**

Thanks Kuai that really helped me out.

**Statistics**

I am not understanding how to set this up. I have n=30 SD=4 xbar=250 after that I am lost

**Statistics**

A survey of 250 lobster fisherman found that they catch an average of 32 pounds of lobster per day with a standard deviation of four pounds. If a random sample of 30 lobster fisherman is selected, what is the probability that their average catch is less than 31.5 pounds?

**Statistics**

I still am not sure how to proceed with this with the information you gave me. Confused on this one

**Statistics**

Reginald Brown an inspector from the department of weights and measures, weighs 15 eighteen-ounce cereal boxes of corn flakes. he finds their mean weight to be 17.78 ounces with a standard deviation of .4 ounces. are the cereal boxes lighter than they should be? let Alpha = .01

**statistics**

John Davis, a manager of a supermarket, wants to estimate the proportion of customers that will be using food stamps at his store. How large a sample is required to estimate the true proportion to within 3% with 98% confidence?

**Calculus Help Please Urgent!!!**

What were your bounds?

**math**

A clerk is packing cubes into a box each cube has edges of 6 inches the dimensions of the box are 15 inches by 30 i.ches by 18 inches find how many cubes will fit in the box ? I don't know how to solve and explain how i found my answer please

**Science**

60,000n

**Statistics**

Think you messed up z=(.526-.47)/sqrt.526*.474/500)it should be Z=(.526-.47)/(.47)(.53)/sqrt 500 = am I right Sir

**Statistics**

Health issues due to being overweight affect all age groups. of children and adolescents 6-11 years of age,18.8% are found to be overweight. A school district randomly sampled 130 in this age group and found that 20 were considered overweight. at Alpha =.05 is this less than ...

**Statistics**

Two groups of climbers (team A and Team B) attempt to climb Mount everest using different routes. The probability of Team A reaching the summit is .70, The probability of Team B reaching the summit is .85. A. Sue calculated the probability the both teams reach the top in the ...

**statistics**

Thank you so much Kuai. This helped me out

**statistics**

If 30% of people in an area are registered voters and 15 people are selected at random from the area: A. what is the probability that at most 3 out of the 15 people are registered voters? B. could we have used the normal approximation to the binomial in part b? Explain why or ...

**statistics**

A basketball scout randomly selected 144 players and timed how long each player took to perform a certain drill. The times in this sample were distributed with a mean of 8 minutes. The population standard deviation was known to be 3 minutes. A. find the critical value for a 95...

**Math**

That does not help calculate the standard of error.

**Math**

LongLast Inc. produces car batteries. The mean life of these batteries is 60 months. The distribution of the battery life closely follows the normal probability distribution with a standard deviation of 8 months. As part of its testing program, LongLast tests a sample of 25 ...

**Algebra**

Calculate 5670 + 3.5% = 198.45 $198.45 + 5670 = $5865.45 Hope this helps.

**statistics**

In which of the following situations would it not be appropriate to use a paired t-test to analyze the data? A. A marriage therapist believes that many couples have different perspectives regarding the state of their marriages, prior to the start of couples therapy. In order ...

**statistics**

The average age for licensed drivers in a county is µ= 42.6, σ= 12 and the distribution is approximately normal. A county police officer was interested in whether the average age of those receiving parking tickets in the county differed from that of the average age ...

**chemistry**

How many calories will 45 grams of water release when it changes fom 85c to 30c?

**Algebra**

x over 2x-5 - 5 over 6x-15

**Calculus Help**

I was just reading the last solution and I was wondering why he had the 1/3 before the pir^2h.

**Math**

Their are 18 green blocks in a bag.their are 3 white blocks for every 2green blocks.witch proportion can be used to find w,the total number of white blocks in the bag?

**Math help Please**

My willy bird is 6 inches and has a mass, M, of 2.1kg. During penetration, it reaches a force or 15.0 N with a coefficient of friction 0.75. Calculate its rotational velocity given no respect to time. How much work is done in a thirty second period?

**Economics**

Suppose Bill is on a low-carbohydrate diet. He can eat only three foods: Rice Krispies, cottage cheese, and popcorn. The marginal utilities for each food are tabulated below. Bill is allowed only 167 grams of carbohydrates daily. Rice Krispies, cottage cheese, and popcorn ...

**Physics**

Find the total change in the internal energy of a gas that is subjected to the following two-step process. In the first step the gas is made to go through isochoric heating until it gains 5363 J and its pressure is 2.92 105 Pa. In the second step it is subjected to isobaric ...

**Math**

Two angles are complementary. Twice one angle plus the other is 96. Find the measure of each angle.

**Science**

If the density of a steel hammer 7gm/cm on earth what would the density be on a spaceship?

**Science**

How many minutes are required for a radio signal to travel for Earth to a space station in Mars if the planet Mars is 7.83 x 10 to the 7th km from Earth?

**Physics**

A 11 kg box slides 4.2 m down a frictionless ramp and then collides with a spring whose spring constant is 250 N/m. What is the maximum compression of the spring? I got 1.35 m but it is incorrect. Any help would be great!