# Posts by luckybee

Total # Posts: 64

algebra 2
complete the square 2x^2-4x-1=0

physics
if a teacher wanted to demonstrate mass in the classroom, which of the following objects should she use? a ruler or an eraser

algebra
how do you solve this equation d/3t + d/4.5(t+1.5) = d

college problem solving 3
an express train leaves new york at 3:00 pm and rreaches boston at 6:00 pm a slow train leaves boston at 1:30pm and arrives in new york at 6:00 pm. if both trains travel at constant speeds at what time do they meet

college problem solving 2
Me and Bill said casey can do the job for you in 10 days but give me alex instead of bill and we can get it done in 9 days. i can do better tha that said slex. let me take bill as a partner and we will do the job for you in 8 days. how long will it take each man to do the job ...

college problem solving
a certain two-digit number is 6 less than the sum of its tens digit and 7 times its units digit. if the digits are reversed the number is increase by 27. fin the original two-digit numbers

math working backwards
I understand thank you.

math working backwards
When working backwards we first need to deal with 1/3. so since it says 1/3 of the remainder, does this mean to divide 24 by 1/3

math working backwards
Sandra spent one-fifth of her money and loaned one-third of the remainder to her brother. She had \$24 left. How much did she begin with?

I solved it. the length of segment CD with by 20 cm. Thank you

There are 3 separate circles, there is a chord drawn through the center of each circle, the point of tangency is on the third circle. So i drew a line perpendicular from the radius of 10 in the third circle to the point of tangency. This is the entire question(Each of the ...

When you have 3 separate circles and the radius of each of those circles is 10 do i calculate like this? 2(10)+2(10)+2(10)=60 cm for my diameter

calculating range
calculating the range of 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 Is the range 16-0 =16

closure propery
Is this set closed under multiplication {-1, 0, 1}

algebra system of equations
solve X^2 + Y^2 =70 Y= 2X + 5

logic
conjecture 17 if A, B, and C are sets, then (A\B)U C = A\(BUC)

geometry
a packaging company manufactures a cardboard box with a volume of 864 cubic inches. the length of the box is 24 inches, and the ends of the box are square. what is the height of the box in inches?

chemistry 211 Lamar Univ
Calculate the number of SO_2 molecules in 9.19 moles of SO_2

chemistry 2411
A high-protein diet contains 71g of carbohydrate, 150 g of protein, and 5.0 g of fat. How many kilocalories does this diet provide? (Round the final answers to the nearest tens place.)

trig
using a right triangle with one angle 24 degrees and the opposite side being 57 feet, write an expression to fine the hypotenuse, X? X=57/sin(24) is this correct?

algebra
a tank used to operate equipment can be filled with air in 3 hours. when the outlet valve is open, the same tank can be emptied in 5 hours. if the tank is filled with the outlet valve open approximately how long will it take to fill the tank? 71/2 hours. Is this correct

logic
a student is using a geometry program to investigate the midsegments of a triangle. the student uses the program to draw triangle ABC, bisect the sides of the triangle, and draw segments connecting the midpoints to form triangle KLM. the student then uses the program to ...

logic
1+3=4=2^2 1+3+5=9=3^2 1+3+5+7=16=4^2 is this an example of inductive or deductive reasoning. I believe it is deductive because it's proven

algebra
marcus rides his bicycle of 3 1/8 hour per day. what is the number of seconds that marcus spends riding his bike each day? My answer: 11,250 is this correct?

trig
a circular chimney pipe with an 8-inch diameter passes vertically from a heater through a metal plate in the roof. the plate has an elliptical hole that measures 8 inches along one axis. if the roof is slanted at an angel of 40 degrees with the horizontal, what is the length ...

geometry
a packaging company manufactures a cardboard box with a volume of 864 cubic inches. the length of the box is 24 inches, and the ends of the box are square. what is the height of the box in inches?

probability
a student rolls three standard six-sided dice. what is the probability that the sum of the numbers that come up will be 18? is the answer 1/216

algebra
what is the graph of 6X^2+6X-12>0? My solution is: an open circle over -2 going to infinite an open circle over +1 going to infinite is this correct?

algebra/functions
a farmer has 600 meters of fencing and plans to use it to build two adjacent rectangular pens as show above. the farmer would like the total area of the two pens to be 1000 square meters. write an equation to determine the value of x? My solution is: 3X^2 - 600X + 2000= 0 is ...

algebra/functions
Dave started his coin collection with 25 coins. the first wee he added 2 coins, the next week he added 4 coins, and the third wee he added 6 coins. If Dave continues adding coins in the same way, how many coins will he have in his collection after one year (52 weeks)? My ...

geometry
A manufacturer wants to package samples of a product in a box with a square base. the package is to have a volume of 100 cubic centimeters. what is the func that will describe the surface area of the box S(x) in ters of the length of a side of the base, X? MY Solution: S(x)= ...

system of equations
X^2 + Y^2 =70 Y = 2X + 5 MY ANSWER: -5.6, 1.6 is this correct?

algebra/functions
a quadractic function y=3x^2-6x+5 is expressed in the form (y-k)= A(x-h)^2, where the poing (h,k) is the vertex of the parobla. What are the value of h and k? (1,2) is this correct?

trig
the horizontal speed of an airplane is 173 miles per hour. the magnitude of the planes velocity is 200 miles per hour. what angle is the plane climbing? My answer is Cos-1 173/200. is this correct

Algebra
A radio tower is supported by a wire fastened to the ground 60 feet away from the base of the tower. If the slope of the wire is 3/2 approximately how long is the wire

pre-calculus
PD= 600(0.978)^t PD is decreasing at 2.2% per year. How did they get 2.2%

precalcus will someone check my homework
f(3)=-3/8 and (f-2)=-12 MY SOLUTION F(-2)=ab^-2 = -12 F( 3)=ab^ 3 = -3/8 b^5 = 12 * 3/8 = 32 b=2 12 = a(2)^2 12 = 4a a =3 f(x)=3(2)^x

parallell and perpendicular lines
please check my homework given P(7,2) and the line y + 3x=7 find the equation for the line parallel line: y+3x+7 y=-3(x-7) +7 y-2=-3x+21+7 y=-3x+28+2 y=-3x+30 perpendicular line: y-2=1/3(x-7) +7 y-2=1/3x-7/3 +21/3 y-2==1/3x + 14 y=1/3x + 14 +2 y=1/3x +16

f(x)=6 fx)=20+2x^2 all under a square root symbol 6=20+2(36) 6=the square root of 92 will someone help me

algebra
give the general formulas for the integer solutions of x^2 + y^2 = z^2. what is x,y, and z when m=18 and n=11

algebra
V=h[( (a+b)/2)^2 + 1/3( (a-b)/2)^2] showing all steps that it reduces to following: v=h/3(a^2 +ab+b^2)

algebra equation
give the general formulas for the integer solutions of x^2 + y^2 = z^2. what is x,y, and z when me=18 and n=11

algebra eqution
V=h[( (a+b)/2)^2 + 1/3( (a-b)/2)^2] showing all steps that it reduces to following: v=h/3(a^2 +ab+b^2)

algebra/functions
recent estimates indicate that the area covered by glaciers has decreased from over 25.5 km^2 in 1850 to about 16.6 km^2 in 1995. Let A=f(t) give the area t years after 2000, and assume that f(t)=16.2-0.062t. How much glacier area disappears in 15 years? MY WORK: 25.5-16.6 =8....

algebra/functions
If F is a decreasing function what can you say about F(-2) compared to F(2)?

algebra/functions
If G is an increasing function. what can you say about G(3) - G(-1)?

re-post for PsyDad gre math prob of a sample
There is a picture of a histogram. the numbers on the x-axis are: 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, and 76. the numbers on the t-axis are: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. there are additional symbols: sigma x =2100, sigma x^2=142540, and Sx=3

gre math prob of a sample
sample standard deviation = 3 sample mean = 68 n=30 what is the probability that one student selected at random from the sample will have a height within one sample standard deviation of the sample mean? a. 1.00 b. 0.73 c. 0.57 d. 0.23

stat counting principles
telephone numbers for a certain city have exchanges of 584, 545, or 586. each of these exchanges is followed by four digits. how many different telephone numbers are possible for this city? a. 3 * 4 b. 3 * 4 * 10 c. 3 * 10^4 d. 3 * 4^10

math gre ques
A sudent is analyzing data from an experiment using a linear model. when the student entered the data into his calculator and ran a least squares linear regression the calculator gave a correlation coefficient of 0.01. what can the student infer from this coefficient? a. the ...

math gre study ques
a student starts with a positive number, x^6, and take the square root three times and the cube root once. this is equivalent to which of the following? a. x^1/4 b. x^4/3 c. x^3/4 d. x^4

math gre question
in an infinite series of circles the radius of the second circle is one half the radius of the first circle and the radius of the third circle is one half the radius of the second circle. if the first circle has a radius of one inch which of the following statements best ...

alg application
two cars leave the station at 9:00 am. the first car head due south at an avg speed of 54mph. the second car heads due west at an avg speed of 72mph. how far apart will the cars be at 1:00pm? my solution: 360mi is this correct

Trig
the horizontal speed of an airplane is 183mph. the magnitude of the plane's velocity is 200mph. write an expression describing the angle the angle the plane is climbing my solution: cos-1 183/200 is this right

statistics
A sudent is analyzing data from an experiment using a linear model. when the student entered the data into his calculator and ran a least squares linear regression the calculator gave a correlation coefficient of 0.01. what can the student infer from this coefficient? 1. the ...

re-post statistics
a weather girl predicts there is a 50% chance of rain and a 10% chance that the rain will turn into snow. What is the probability that it will snow? statistics - Ms. Sue, Friday, January 6, 2012 at 9:08pm What on earth is a "weather girl?" That's what the ...

statistics
one of six radios in a crate is known to be defective. the radios are tested one at a time. if the first two radios are not defective, what is the probability that the third radio tested is defective.

statistics
a weather girl predicts there is a 50% chance of rain and a 10% chance that the rain will turn into snow. What is the probability that it will snow?

geometry
to estimate the number of daises in a field students toss a ball into the field and mark a circular region with a radius of 15 feet from where the ball landed. the students then counted 35 daises in the circular region. if the entire field is approximately rectangular with ...

statistics
I thought order matters in this problem because it says 3 letters then 4 digits. So should nPr be used? 26P3= 15600 10P4 = 5040 (5040)(15600)= 78624000

statistics
how many different license plates can be made consisting of three letters by four digits?

statistics
A group is studying age distribution of people living in town. The mean age is 45, the modal age is 59, the median age is 56, the range is 96, and the standard deviation is 20.5. Is the data positively or negatively skewed

statistics
a point is randomly selected within the rectangle with vertices at (2,0), (2,2), (-4,2), and (4,0). What is the probability that the point's x-coordinate and y-coordinate are both positive?

statistics
a computer system requires all users to log on using a 6 character password. if each character can be either a digit from 0 to 9 or a letter of the alphabet, what is the number of possible passwords. please show formula used

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