# Posts by robert

Total # Posts: 988

**biology**

how can i construct a dichotomous key that can be used to identify the following: mango leaf, tridax procumbent leaf, cassia leaf, grass leaf, and cassava leaf.

*April 24, 2014*

**math**

i still have some problems

*April 23, 2014*

**math**

sweets are shared equally among 20 children at a party. if there were 1 more sweet and 1 more child, each child would get 1 sweet less. how sweets were shared at the party? thats how the question ends.

*April 23, 2014*

**math**

find the inverse of the function, f(x)=x-1

*April 23, 2014*

**math**

the first three terms of a GP are the first, fourth and tenth terms of an AP. given that the first term is 6 and that all the terms of a GP are different, find the common ratio.

*April 21, 2014*

**social studies**

Yes

*April 21, 2014*

**math**

which figure must have both parallel and perpendicular sides.

*April 10, 2014*

**math**

john ordered a new sign for her store. The sign has 4 sides . It also has 2 right angles. 1 acute angle , and 1 obtuse angle . What is the shape of the sign.

*April 10, 2014*

**math**

how many weeks in 3 years, explain your answer.show the work

*April 10, 2014*

**C++ Programming**

Create a class that holds robot warriors. Each has a string for their name, a number of hit points (an float), armor (a defensive modifier(an int)), and weaponry (an offensive multiplier(another int)). You will create 5 robots with a random number in each category (500 – ...

*April 7, 2014*

**Statistics**

. A 2003 Harris Poll of 993 randomly selected American adults found that 69% believed in capital punishment (death penalty). A sample size of 1010 American adults in 2000 found that 64% believed in capital punishment. Write the hypotheses for a significance test to determine ...

*March 29, 2014*

**Math**

-12i

*March 24, 2014*

**PRE-CALC**

c) .4

*March 24, 2014*

**statistics**

Smith is a weld inspector at a shipyard. He knows from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done will be substandard. If Smith checks 300 of the 7500 welds completed that shift, what is the probability that he will find ...

*March 18, 2014*

**algebra**

9x+y=11

*March 14, 2014*

**Probability**

totally lost!!

*March 7, 2014*

**Physics 130**

A 20kg child slides down a long slide in a playground. She starts from rest at a height of 25m. When she is part way down the slide at a height of 10m, she is moving at 16m/s. Calculate the mechanical energy lost due to friction.

*February 25, 2014*

**math**

It tells you how many received a better than average grade so... 24/50= *100

*February 25, 2014*

**Physics 130**

Thank you so much!

*February 25, 2014*

**Physics 130**

can you explain the 20sin30?

*February 25, 2014*

**Physics 130**

It says nothing about friction, so assume its frictionless.

*February 25, 2014*

**Physics 130**

you push a 15kg cart with a force of 20N, 30 degrees below the horizontal. what is the normal force? Please help test tomorrow.

*February 25, 2014*

**physics**

A 2.5kg solid homogenous ball is rolling without slipping at 3.0 meters per second to the right on a level surface. The diameter of the ball is 80 centimeters. What is the total kinetic energy of the ball? Can someone give me the equation for this?

*February 24, 2014*

**Physics**

A 2.5kg solid homogenous ball is rolling without slipping at 3.0 meters per second to the right on a level surface. The diameter of the ball is 80 centimeters. What is the total kinetic energy of the ball? Can someone give me the equation for this?

*February 24, 2014*

**chemistry**

If 1.87 g of acetic acid(CH3CO2H) reacts with 2.31 g of isopentyl alcohol(C5H12O) to give 2.96 g of isopentyl acetate(C7H14O2), what is the percent yield of the reaction?

*February 23, 2014*

**Physics**

First start with an isothermal expansion at 2.0 atm from 1.0 L to 4.0 L. If this now is adiabatically compressed back to its original volume, what is the change in internal energy here? Also what are some examples of these processes?

*February 18, 2014*

**2 question**

T is incorrect

*February 17, 2014*

**english**

romance

*February 4, 2014*

**physics**

sin inverse of .032

*January 28, 2014*

**physics**

Voltage=12V. R1=2.0ohms and R2=4.0ohms. Find the power used by R2.

*January 26, 2014*

**science**

A car of mass 1500 kg accelerates up a hill of incline 8 degrees, increasing its speed from 4 ms to 16 ms over a distance of 90m. Assuming a total frictional resistance of 1000 N, calculte: a) the tractive effort between the wheels and the road surface b)the work done during ...

*January 26, 2014*

**language arts**

3. What inference can you make about Jo based on the selection? (1 point)Jo is adventuresome and enjoys traveling to new places. Jo is afraid of activities in the water. Jo is worried about what other people think of her. Jo is quiet and shy around new people.

*January 21, 2014*

**Physics**

Earlier I posted the tension question I knew how to get the equation of 50*9.81 = 2 (4360) sin A. I just don't know how to find (sin A) from here.

*January 20, 2014*

**physics**

The combined mass of a man and a chair suspended at the midpoint of a rope of negligible mass is 50 kilograms. The rope is connected to a weight of 4360 newtons hanging from a massless frictionless pulley. Find the angle.

*January 20, 2014*

**Physics -- URGENT**

Estimate the force a person must exert on a string attached to a 0.200 kg ball to make the ball revolve in a circle when the length of the string is 0.600 m. The ball makes 1.40 revolutions per second. Do not ignore the weight of the ball. In particular, find the magnitude of ...

*January 8, 2014*

**Physics AP**

A conical pendulum is formed by attaching a 50 g mass to a 1.2m string. The mass swings around a circle of radius 25cm. A claculate the speed of the mass. B Calculate the acceleration of the mass. C calculate the tension in the string

*December 19, 2013*

**grade 12 Functions**

A ferris wheel with a diameter of 60m rotates at a constant speed three times every 1.5pie minutes and reaches a maximum height of 62m from the ground. if you started the ride when it is at its highest point, on what internal of time would you be more than 58m above the ground...

*December 17, 2013*

**Physics Classical Mechanics**

A person of mass m2= 85.0 kg is standing on a rung, one third of the way up a ladder of length d= 4.0 m. The mass of the ladder is m1= 15.0 kg, uniformly distributed. The ladder is initially inclined at an angle θ= 40.0∘ with respect to the horizontal. Assume that ...

*December 12, 2013*

**math**

The bases of trapezoid ABCD are \overline{AB} and \overline{CD}. Let P be the intersection of diagonals \overline{AC} and \overline{BD}. If the areas of triangles ABP and CDP are 8 and 18, respectively, then find the area of trapezoid ABCD.

*December 8, 2013*

**Math**

An article in the local paper states that 30% of the students at Oak Grove Middle School earned a place on the Silver Honor Roll. If there are 920 students at Oak Grove, how many are on the Silver Honor Roll? USE A PERCENT RULER TO HELP YOU DECIDE. SHOW ALL YOUR WORK... I DON...

*October 30, 2013*

**biology**

The answer is A.

*October 10, 2013*

**physics**

A stone is dropped off a cliff, the last 1.5 seconds before it reaches the ground it travels 30 meters. Find the height from which it dropped & final velocity

*October 7, 2013*

**science of speed and acceleration**

You are traveling at a speed of 42 miles in .75 hours and slow to a speed of 42 miles in 1.25 hours. What is your rate of deceleration?

*September 24, 2013*

**science**

You are traveling at a speed of 42 miles in .75 hr and slow to a speed of 42 miles in 1.25 hr. What is your rate of declaration?

*September 24, 2013*

**College Algebra**

If a ball dropped from the top of a 400 ft building to hit the ground, how long would it take in seconds?

*September 8, 2013*

**physics**

666 meters

*September 1, 2013*

**physics**

A bus accelerates from rest at 1.5m/s^2 for 12s. It then travels for 25s after which it slows to a stop with an acceleration of magnitude 1.5m/s^2. (a) Find the total distance the bus travel snd its average velocity of the trip.

*September 1, 2013*

**physics**

A bus accelerates from rest at 1.5m/s^2 for 12s. It then travels for 25s after which it slows to a stop with an acceleration of magnitude 1.5m/s^2. (a) Find the total distance the bus travels And its average velocity of the trip.

*September 1, 2013*

**math**

my domain is 1,2,3,4,5,6 and my range is 180,165,150,135,120,105, the domain is increasing by 1 and the range is decreasing by 15 but I do not know how to write the function

*August 23, 2013*

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

The smallest possible positive value of 1−[(1/w)+(1/x)+(1/y)+(1/z)] where w, x, y, z are odd positive integers, has the form a/b, where a,b are coprime positive integers. Find a+b.

*June 14, 2013*

**Pre-Calculus**

A gardener has 100' of edging. She wants to use it to enclose a 130 square foot rectangular area; she does not have to use up all of the edging. What are the possible lengths that a side of the rectangle can have? Answer using interval notation. Hint: If the length of the ...

*May 30, 2013*

**GEOGRAPHY**

Assume that a parcel of air is forced to rise up and over a 6000-foot-high mountain. The initial temperature of the parcel at sea level is 76.5°F, and the lifting condensation level (LCL) of the parcel is 3000 feet. The DAR is 5.5°F/1000’ and the SAR is 3.3°F/...

*May 26, 2013*

**vectors problem!!!! help!!!!**

thanks sir!!!!

*May 26, 2013*

**vectors problem!!!! help!!!!**

Vectors u=2i+9j+0k and v=13i+18j+0k. What is the value of |u×v|?

*May 26, 2013*

**help!!!!! Probability!!!**

thanks sir...

*May 26, 2013*

**statistics**

4000

*May 4, 2013*

**statistics**

After calculating the sample size needed to estimate a population proportion to within 0.05, you have been told that the maximum allowable error (E) must be reduced to just 0.025. If the original calculation led to a sample size of 1000, the sample size will now have to be .

*May 4, 2013*

**geometry!!!! PLEASE HELP!!!!**

Two angles of an isosceles triangle are 68∘ and x∘. What is the sum of all the (distinct) possible values of x?

*April 24, 2013*

**math**

joey planted 2/5 of the garden and jane planted 1/3 what fraction of the garden did they plant

*April 24, 2013*

**physics**

A bead of mass m = 40.5 kg is released from point A which is located 5 m above the ground and slides on the frictionless track as shown in the figure. Determine the beads speed when it reaches point C which is located 2.0 m above the ground.

*April 12, 2013*

**math**

1. 2xsquared-7x=-6 2. xsquared + 12x + 1= 0 3. xsquared + 6x + 20 = 0

*April 9, 2013*

**SS Please check answers**

Iris is correct.

*April 8, 2013*

**Physics (fluids)**

1. You have a large wind tunnel of cross-sectional area 0.61[m2]. The wind speed is 4[ms-1]. Assume air density is 1 [kgm-3]. The Drag is 2.3[N]. What is the coeffecient of drag for the shape that has diameter 7.32[cm]? . Use three sig. figs. or N/A if there is not enough ...

*April 7, 2013*

**math**

That is not the only option it is A.5 B.6 C.10 D.180

*March 30, 2013*

**math**

At a dinner 1/6 of an apple pie is severed each time it is ordered. How many total apple pies would be served if apple pie was ordered 30 times in one day? A.5

*March 30, 2013*

**mathematics**

what is a rectangular area model?

*March 28, 2013*

**physics**

A car traveling at 150 miles/hour strikes a wall and bounces backwards at 30 miles/hour. If the car is in contact with the wall for 0.1 seconds, what is the force that the car exerts on the driver.

*March 24, 2013*

**Chemistry**

How many milliliters of 6.50 M HCl(aq) are required to react with 5.95 g of an ore containing 35.0% Zn(s) by mass?

*March 20, 2013*

**science**

How does the hierarachical organization of organisms work within a system?

*March 20, 2013*

**Chemistry**

59.0 mL of a 1.80 M solution is diluted to a total volume of 268 mL. A 134-mL portion of that solution is diluted by adding 171 mL of water. What is the final concentration? Assume the volumes are additive.

*March 19, 2013*

**Chemistry**

How many milliliters of 11.5 M HCl(aq) are needed to prepare 310.0 mL of 1.00 M HCl(aq)?

*March 19, 2013*

**math(statistics)**

1. Assume that x is a binomial variable with an expected value of 3 and variance of 2.4 .find (a) P(x=0) (b) P(x=12) THnxs

*March 19, 2013*

**english**

Write the pronoun in these sentences. Then write the underlined words,that they replace. " Let us think of a way to clean up litter," said Matt and Lynn. ( the underlined word is Matt and Lynn)

*March 18, 2013*

**median help**

Pat recorded the weights of the first ten fish she caught and released at Mirror Lake this season. The weights were 8 lb, 6 lb, 9 lb, 6 lb, 7 lb, 5 lb, 7 lb, 6 lb, 23 lb, and 6 lb. What is the median of the data set

*March 8, 2013*

**math help**

please help

*March 8, 2013*

**math help**

Pat recorded the weights of the first ten fish she caught and released at Mirror Lake this season. The weights were 8 lb, 6 lb, 9 lb, 6 lb, 7 lb, 5 lb, 7 lb, 6 lb, 23 lb, and 6 lb. What is the median of the data set

*March 8, 2013*

**Chemistry**

1.) A 3.000gram sample of a hydrate compound containing Co, C2O4, and H2O was combusted to give 1.316g of Co3O4. What is the percentage of Cobalt in the oxide? 3.) 2.000 grams of a sample containing Co, C2O4, and H2O showed there to be 0.9621g of oxalate in the sample. Was is...

*March 3, 2013*

**physics**

A girl whirls a stone in a horizontal circle 1.5 m above the ground by means of a string 141 cm long. The string breaks, and the stone flies of horizontally and strike the ground 13.6 m away. What is the centripetal acceleration of the stone while in circular motion?

*February 22, 2013*

**Chemistry**

A sample of metallic element X, weighing 4.315g, combines with0.4810 L of Cl2 gas (at normal pressure and 20.0C) to form the metal chloride with the formula XCl. If the density of Cl2 gas under these conditions is 2.948g/L, what is the mass of chlorine? The amu of chlorine is ...

*February 18, 2013*

**Physics please help im DESPERATE**

A small steel ball bearing with a mass of 17.0 g is on a short compressed spring. When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.23 m. Calculate the horizontal distance the ball would travel if the same spring were aimed 39.0 deg ...

*February 8, 2013*

**physics**

If 3000ft/3 of air crossing an evaporator coil and is cooled from 75F to 55F, what would be the volume of air,in ft/3, exiting the evaporator coil?

*February 1, 2013*

**Math**

I still need help. That didn't help me.

*January 31, 2013*

**Math**

Use fraction strips to find each sum or difference. Simplify if possible. 2 1/3 + 1 2/3 3 5/6 + 4 3/6 4 6/10+ 5 7/10 1 1/6 + 3 5/6 2 4/9 + 6 7/9

*January 31, 2013*

**Math**

Estimate each sum and difference. 3 1/4 + 2 5/6 5 6/9 - 1 3/4 5 5/13 + 8 3/5 11 - 6 3/7 + 2 2/5

*January 30, 2013*

**Math**

Estimate each sum and difference. 3 1/4 + 2 5/6 5 6/9 - 1 3/4 5 5/13 + 8 3/5 11 - 6 3/7 + 2 2/5

*January 30, 2013*

**Algebra 2**

How do the graphs of y=1/x and y=5/x+6 compare?

*January 30, 2013*

**Chemistry (Biochem)**

I'm given two pictures looking down the alpha helices of a coiled coil dimer of alpha-keratin. I'm asked to identify three statements out of the following that are true. My guesses are 2, 3, and 6. 1. Leu-Glu-His-Val-Cys-Lys-Ser is a likely repeat in the α helix ...

*January 27, 2013*

**physics**

If Santa were in the elevator at the North Pole - where the earth's radius is less than at the equator - he is closer to the center of the earth and would therefore weigh more.

*January 25, 2013*

**Physics**

A 50.0 g Super Ball traveling at 27.0 m/s bounces off a brick wall and rebounds at 17.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 4.00 ms, what is the magnitude of the average acceleration of the ball during this time interval? (...

*January 24, 2013*

**Math**

How do I solve this math problem. -10+ V_=-3. 2

*January 23, 2013*

**Math**

How do I solve this math problem. -2-10a=158

*January 23, 2013*

**Math**

How do I go about solving this math problem. -172=-1-9p

*January 23, 2013*

**Math**

I have a word problem with fractions. Anna estimated that her brother Nick ate about 1/3 of an apple pie, her brother Matt ate 5/8 of the pie, and she ate about 1/4 of the pie. How might you convince Anna that her estimates do not make sense? Be sure to show every step of your...

*January 23, 2013*

**Physics**

A football is kicked 65 m. If the ball is in the air for 4.3 s, find its horizontal velocity vx. Enter m/s as unit and use g = 10. m/s2. What is its initial vertical velocity vy? Enter m/s as unit. With what initial speed was the football kicked? Enter m/s as unit.

*January 22, 2013*

**Physics**

Harry and Hermione look from their balcony to a swimming pool below that is 12.0 m from the bottom of their building. They estimate the balcony is 30.0 m high and wonder how fast they would have to jump horizontally to succeed in reaching the pool. What is your answer? Enter m...

*January 22, 2013*

**Physics**

Brittany throws a slingshot pellet directly at a target that is far enough away to take 0.190 s to reach. How far below the target does the pellet hit? Enter m as unit. How high above the target should she aim? Enter m as unit.

*January 22, 2013*

**Physics**

A car sits in the parking lot. Above is a cargo plane, flying horizontally at 61 m/s. At the exact moment the plane is 182 m directly above the car, a crate accidentally falls from its cargo doors. Relative to the car, where will the crate land? Enter m as unit and use g = 10...

*January 22, 2013*

**Physics**

Bert is standing on a ladder picking apples in his father's orchard. As he pulls each apple off the tree, he tosses it into a basket that sits on the ground 2.2 m below at a horizontal distance of 1.3 m from Bert. How fast must Bert throw the apples (horizontally) in order...

*January 22, 2013*

**Physics**

A ball rolls off the edge of a balcony at 8.0 m/s. Find its speed after 3.8 s in the air. Use g = 10. m/s2 and enter m/s as unit.

*January 22, 2013*

**Physics**

In her physics lab, Jessica rolls a 20-g marble down a ramp and off the table with a horizontal velocity of 1.10 m/s. The marble falls in a cup placed 0.44 m from the table's edge. Find the table's height. Use g = 10. m/s2. Enter m as unit.

*January 22, 2013*