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edjones answered: 7568 problems
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Quadratic_Equations/366613: a punter, punts the football at the 40 yard line at the equation of y=-0.008x^2+2.5x+1. I know how to graph a linear function starting at a cirtain point, how would you graph a quadratic function from the 40 yard line? 1 solutions Answer 261403 by edjones(7569)   on 2010-11-05 23:54:11 (Show Source): You can put this solution on YOUR website! What does x represent? What question does the problem ask?

Evaluation_Word_Problems/366635: Use given information to write a system of equations; then, solve the system. Be sure to clearly identify all unknowns in the equation. An auto mechanic student needs 25 gallons of a 21% antifreeze solution. She has available a 40% solution and a 15% solution. How much of each solution should she use to end up with 21% solution? 1 solutions Answer 261401 by edjones(7569)   on 2010-11-05 23:49:37 (Show Source): You can put this solution on YOUR website! 25*.21=5.25 x*.40=.40x (25-x)*.15=3.75-.15x . .40x+3.75-.15x=5.25 .25x=1.5 x=6 gal. of 40% 25-x=19 gal. of 15% . Ed

Exponents/366741: hello my ? is Problem: (6-5^2expon.)+7=? Answer: i got was 8 please help me. I tried with tutorvista but they were rude and all they wanted was money,they had false advertisement. THANK YOU 1 solutions Answer 261397 by edjones(7569)   on 2010-11-05 23:28:01 (Show Source): You can put this solution on YOUR website! 6-5^2+7 =6-25+7 =12 . Ed

Triangles/366711: in a triangle ABC,angle B is 4 times angle A and angle C is 15 less than 5 times angle A. 1 solutions Answer 261394 by edjones(7569)   on 2010-11-05 23:25:59 (Show Source): You can put this solution on YOUR website! b=4a c=5a-15 . a+4a+5a-15=180 10a=195 a=19.5 deg b=78 deg c=82.5 deg . Ed

Expressions-with-variables/366712: 1 solutions Answer 261392 by edjones(7569)   on 2010-11-05 23:19:36 (Show Source): You can put this solution on YOUR website! x/5 + 36 > 51 x+180>255 multiply each side by 5. x>75 . Ed

Polynomials-and-rational-expressions/366715: The lengths of three sides of a right triangle are consecutive even integers. Find the length of each side of the triangle. (Recall the Pythagorean Theorem: a^2 + b^2 = c^2, where a and b are the lengths of the two legs and c is the length of the hypotenuse.) Thank you for the help! 1 solutions Answer 261387 by edjones(7569)   on 2010-11-05 23:14:03 (Show Source): You can put this solution on YOUR website! Let the integers be x, x+1 and x+2. x^2+(x+1)^2=(x+2)^2 Pythagoras x^2+x^2+2x+1=x^2+4x+4 x^2-2x-3=0 (x-3)(x+1)=0 x=3 . Ed

Miscellaneous_Word_Problems/366704: I need help with these 3 problems. Thank you! A shop sells compact disks for $15 a piece. If each disk costs $6 to the shop owner how much profit percent does the shop owner earn? A computer company gives a discount of 10% on a new piece of software. If it makes a profit of 4%, what percent does the marked price exceed the cost price? What single discount is equivalent to two successive discounts of 15% and 7%? 1 solutions Answer 261381 by edjones(7569)   on 2010-11-05 23:02:36 (Show Source): You can put this solution on YOUR website! Let p=profit 6p=15 p=15/6 =5/2=2.5=250% . Ed

Functions/366717: Consider the following function: f(x)=10x^3-29x^2-115x+50 factors: (2x+5)(5x-2) A) Verify the given factors of the function x B)Find the remaining factor(s) of f C) Write the complete factorization of f I have been able to successfully verify that the given factors are factors of the function, however I am having a hard time finding the other factor(s). Can you please help! Thank you 1 solutions Answer 261376 by edjones(7569)   on 2010-11-05 22:49:56 (Show Source): You can put this solution on YOUR website! Multiply (2x+5)*(5x-2) Divide the result into 10x^3-29x^2-115x+50 to find the final factor. . Ed

Linear-equations/366720: if a number is decreased by 14 and that result is then divided by 5, the answer is 15. find the number. how do i write that? 1 solutions Answer 261371 by edjones(7569)   on 2010-11-05 22:37:54 (Show Source): You can put this solution on YOUR website! Let x=the number. (x-14)/5=15 . Ed

Quadratic-relations-and-conic-sections/366724: What changes would shift this function down 3 and to the left 5: 1 solutions Answer 261369 by edjones(7569)   on 2010-11-05 22:35:23 (Show Source): You can put this solution on YOUR website! f(x)=x^2 g(x)=(x+5)^2-3 . Ed .

Quadratic-relations-and-conic-sections/366726: Beginning with the function what function would represent that same curve flipped over the x-axis and then shifted 4 units down? 1 solutions Answer 261365 by edjones(7569)   on 2010-11-05 22:26:42 (Show Source): You can put this solution on YOUR website! f(x)=-x^2-4

Complex_Numbers/366614: Give exact and approximate solutions to three decimal places. (x-7)^2=45 (what are the exact solutions) and (what are the approximate solutions) Problem 2 same as above I need help with the exact and approximate solutions to x^2+16x+64=49 Solve by completing the square: x^2 +1/2x=1 Solve for X x^2 + 14x + 4=0 a) solve 5x+x(x-3)=0 What are the solutions? b)Find the x intercepts of f(x)= 5x+x (x-3) 1 solutions Answer 261361 by edjones(7569)   on 2010-11-05 22:17:57 (Show Source): You can put this solution on YOUR website! For exact rational numbers are required. For approximate decimals can be used. (x-7)^2=45 x-7=+-sqrt(9*5) x=7+-3sqrt(5) x=7+3sqrt(5), x=7-3sqrt(5) [exact] . x=13.708, x=.292 [approximate] . Ed

percentage/366649: Hello, Can someone show me how to figure out Measure of Central Angle (in degrees. Type Frequency O+ 6 A+ 6 B+ 2 O- 1 A- 1 AB+ 1 B- 1 Percentage of total for the percentage I divided the frequency by total which is 18 Measure of Central Angel in Degrees Here is where I am lost. It is a Central Angel for a pie chart. Please help me. Thank you, I sorry it just that I have been out of school for 15 years and I get confused. 1 solutions Answer 261343 by edjones(7569)   on 2010-11-05 21:23:15 (Show Source): You can put this solution on YOUR website! Type....Freq...Degrees O+..... 6.......120 A+..... 6.......120 B+..... 2........40 O-..... 1........20 A-..... 1........20 AB+.... 1........20 B-..... 1........20 -----------------------add .................360 . . There are 360 degrees in a circle. 6+6+2+1+1+1+1=18 360/18=20 degrees . Ed

Probability-and-statistics/366660: Which pair has equally likely outcomes? Check the two choices below which have equal probabilities of success. A standard deck of cards has 12 face cards and four Aces (Aces are not face cards). A. drawing a black two out of a standard 52 card deck given it’s not a face card or an Ace. B. drawing a six out of a standard 52 card deck given it’s not a face card or an Ace. C. rolling a sum of 7 on two fair six sided dice D. rolling a sum of 3 on two fair six sided dice E. rolling a sum of 10 on two fair six sided dice 1 solutions Answer 261336 by edjones(7569)   on 2010-11-05 21:07:33 (Show Source): You can put this solution on YOUR website! B) There are 52 possibilities. There are 4 fours in the deck. 4/52=1/13 . D) There are 36 possibilities. 21, 12 there are two ways to make a 3. 2/36=1/18 . Ed

Equations/366688: A=2.589R^2 solve for R 1 solutions Answer 261330 by edjones(7569)   on 2010-11-05 20:59:17 (Show Source): You can put this solution on YOUR website! A=2.589R^2 R^2=A/2.589 R=sqrt(A)/1.609 R=.6215sqrt(A) . Ed

Problems-with-consecutive-odd-even-integers/366366: what are the numbers to be found in this word problem? :the greater number is 1 more than twice the smaller.three times the greater exceeds 5 times the smaller by 10 1 solutions Answer 261125 by edjones(7569)   on 2010-11-05 01:57:22 (Show Source): You can put this solution on YOUR website! x=2y+1 3x=5y+10 3(2y+1)=5y+10 6y+3=5y+10 y=7 x=15 . Ed

Equations/366372: How do you solve the equation: 5n + 7 = 7(n+1) - 2n 1 solutions Answer 261124 by edjones(7569)   on 2010-11-05 01:54:06 (Show Source): You can put this solution on YOUR website! 5n + 7 = 7(n+1) - 2n 5n+7=7n+7-2n 5n+7=5n+7 0=0 True for all n. . Ed

Miscellaneous_Word_Problems/366390: Next-door neighbors Bob and Jim use hoses from both houses to fill Bob's swimming pool. They know that it takes 16 h using both hoses. They also know that Bob's hose, used alone, takes 50% less time than Jim's hose alone. How much time is required to fill the pool by each hose alone? 1 solutions Answer 261123 by edjones(7569)   on 2010-11-05 01:51:28 (Show Source): You can put this solution on YOUR website! together 16 hr Let jim's=j and bob's=.5j 1/j + 1/.5j = 1/16 8j+16j=.5j^2 24j=.5j^2 .5j^2-24j=0 j^2-48j=0 multiply each side by 2. j(j-48)=0 j=48 hr b=24 hr . Ed

Probability-and-statistics/366411: Approximately 11% of the civilian population are veterans. Choose 5 civilians at random. What is the probability that none are veterans? What is the probability that at least 1 is a veteran? 1 solutions Answer 261121 by edjones(7569)   on 2010-11-05 01:33:41 (Show Source): You can put this solution on YOUR website! .11 are veterans; .89 are not. .89^5=.5584 the probability that none are veterans. . 1-.5584=.4416 the probability that at least 1 is a veteran. . Ed

testmodule/366424: How do i derive the function f(t)= -20(t-20)3 + 20,000 1 solutions Answer 261120 by edjones(7569)   on 2010-11-05 01:19:47 (Show Source): You can put this solution on YOUR website! f(t)=-20(t-20)3 + 20,000 =-20(t^3+60t^2+1200t-80000)+20000 =-20t^3+1200t^2-24000t+1600000+20000 =-20t^3+1200t^2-24000t+1800000 . Ed

Inequalities/366427: Hello, Please help me solve the following inequality problems. 1. 6x+8>9, with x=4 2. 2x2 + 7 > 8 x = 2 3. 100>-5/3x +6>0 4. 10y>9 5. 3+t<7 1 solutions Answer 261118 by edjones(7569)   on 2010-11-05 01:06:25 (Show Source): You can put this solution on YOUR website! 3+t<7 t<4

Travel_Word_Problems/366282: I need help with these word problems. thanks! you are riding your bicycle. it takes you 21 min. to go 5 miiles. if you continue traveling at the same rate, how long will it take you to go 12 miles? according to guinness book of world records, the peregrine falcon has a record diving speed of 168 miles per hr. Write this speed in feet per second. 1 solutions Answer 261116 by edjones(7569)   on 2010-11-05 01:03:08 (Show Source): You can put this solution on YOUR website! mpm = miles/minute speed=5/21 mpm speed*time=distance (5/21)t=12 t=12*21/5 =50.4 minutes. . Ed

Probability-and-statistics/366312: A web based test generator assigns 1 of 100 possible questions as the first question on a practice quiz. If 20 students take the quiz, what is the probability that at least 2 of the 20 are assigned the same first question? 1 solutions Answer 261109 by edjones(7569)   on 2010-11-05 00:41:45 (Show Source): You can put this solution on YOUR website! 100/100 * 99/100 * 98*100 * ... * 81/100 = Probability that no-one is assigned the same question. =100!/(80!*100^20) =.13 1-.13=.87 the probability that at least 2 of the 20 are assigned the same first question. . This question is similar to the birthday problem which states that if 23 people are in a room it is statistically likely that 2 have the same birthday. . Ed

Probability-and-statistics/366370: If three cards are dealt from a full deck, use a tree diagram to find the probability that exactly one is a spade. (Round the answer to the nearest hundredth.) 1 1 solutions Answer 261101 by edjones(7569)   on 2010-11-04 23:34:13 (Show Source): You can put this solution on YOUR website! You will have to do the tree diagram. nCr=n!/((n-r)!r!)= Combination of n things taken r at a time. . (13C1*39C2)/52C3 =(13*741)/22100 =.44 probability that exactly one is a spade. . Ed

test/364911: Solve for y 2x-2y=6 1 solutions Answer 260147 by edjones(7569)   on 2010-11-01 23:28:12 (Show Source): You can put this solution on YOUR website! 2x-2y=6 -2y=6-2x subtract 2x from each side. y=x-3 divide each side by -2. . Ed

Probability-and-statistics/364598: You have a bag of marbles. There are twice as many blue marbles as red marbles. There are 4 less green marbles than red marbles. If there are 28 marbles in the bag, how many of each marble is in the bag? USE THE FIVE STEP PROBLEM SOLVING APPROACH. PLEASE help me, I have been stuck on this problem for so long, and I really need to get it done, but I don't even know where to begin. Thanks! :) 1 solutions Answer 260016 by edjones(7569)   on 2010-11-01 15:51:36 (Show Source): You can put this solution on YOUR website! b=2r g=r-4 r+g+b=28 r+r-4+2r=28 substitute r for g & b. 4r-4=28 4r=32 r=8 b=16 g=4 . Ed

Triangles/364608: If a triangle's hypotenuse is 3 feet, and it's angle of incline is 25 degrees, what are the lengths of its sides? 1 solutions Answer 260009 by edjones(7569)   on 2010-11-01 15:40:51 (Show Source): You can put this solution on YOUR website! opp/hyp=sin opp/3=.4226 opp=1.2679 . adj/hyp=cos adj/3=.9263 adj=2.7189 . Ed

Polynomials-and-rational-expressions/364607: Give the domain and range for the rational function. Use interval notation. f(x)=(10/x) +1 1 solutions Answer 260004 by edjones(7569)   on 2010-11-01 15:30:48 (Show Source): You can put this solution on YOUR website! f(x)=(10/x) +1 The denominator cannot equal zero, so x cannot be zero. Domain: (-infinity, 0)U(0, infinity) . Ed .

Graphs/364609: solve inequality and graph the solutions 4x < -12 1 solutions Answer 260002 by edjones(7569)   on 2010-11-01 15:14:10 (Show Source): You can put this solution on YOUR website! 4x < -12 x<-3 divide each side by 4. . Ed

Complex_Numbers/364613: what is the sol ution for 6i/3i? Thanks 1 solutions Answer 260000 by edjones(7569)   on 2010-11-01 15:12:56 (Show Source): You can put this solution on YOUR website! 6i/3i=2

Radicals/364567: _x^2_ + ___7___ = 1 X^2-4 x+2 Hope this makes sense. 1 solutions Answer 259998 by edjones(7569)   on 2010-11-01 15:10:55 (Show Source): You can put this solution on YOUR website! x^2/(x^2-4) + 7/(x+2) = 1 x^2+7(x-2)=x^2-4 multiply each side by (x+2)(x-2) x^2+7x-14=x^2-4 7x=10 x=10/7 . Ed