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# Recent problems solved by 'edjones'

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 Graphs/347657: I have tried so many different things on this problem, thinking through why they would be what they are and I still got them wrong. Please help me understand. This is what I put for each in order, it is what I was convinced the answer was. (F,T,T,F,F,F,F) Why are any of these wrong? (1 pt) Let the function f be defined by f(x) = {1}/{sqrt{1-x^2}}. Indicate whether the following statements are True (T) or False (F). You must get all answers correct in order to receive credit. ___1. f(x) is never positive. ___2. 1 is in the domain of f ___3. 0 is in the domain of f ___4. f(x) is never negative. ___5. All negative real numbers are in the domain of f ___6. f(x) is never zero. ___7. All positive real numbers are in the domain of f 1 solutions Answer 248523 by edjones(7569)   on 2010-09-24 15:15:45 (Show Source): You can put this solution on YOUR website!f(x)=1/sqrt(1-x^2) . 2. 1-x^2>0 If it is zero then there is division by zero which is not allowed. If it is less than zero then the denominator is an imaginary number, also not allowed. -x^2>-1 x^2<1 2 is F . The rest of your answers are correct. . Ed
 Geometry_Word_Problems/347668: Suppose there are two cubes, with the first cube having a side of h, and the second cube having a side of 5h. What is the relation of the volume of the first cube to the volume of the second?1 solutions Answer 248510 by edjones(7569)   on 2010-09-24 14:06:57 (Show Source): You can put this solution on YOUR website!h^3/125h^3=1/125 the relation of the volume of the first cube to the volume of the second. . Ed
 Volume/347329: What is the volume of a rectangle 30 inches wide, 80 inches long, and 5 inches high?1 solutions Answer 248351 by edjones(7569)   on 2010-09-23 18:16:58 (Show Source): You can put this solution on YOUR website!80*30*5=12,000 in^3
 Surface-area/347323: how many 2in by 2in squares will fit inside a 3in by 5in rectangle without overlapping1 solutions Answer 248350 by edjones(7569)   on 2010-09-23 18:09:02 (Show Source):
 Probability-and-statistics/347326: Assuming that no questions are omitted, in how many ways can a six question true false quiz be answered?1 solutions Answer 248346 by edjones(7569)   on 2010-09-23 18:04:44 (Show Source): You can put this solution on YOUR website!2^6=64 different ways
 Miscellaneous_Word_Problems/347313: If the sides of a square are lengthened by 6cm, the area becomes 121cm^2. find the length of a side of the original square The length of a side of the original square is _?_cm1 solutions Answer 248342 by edjones(7569)   on 2010-09-23 18:00:18 (Show Source): You can put this solution on YOUR website!sqrt(121)=11 11-6=5 cm . Ed
 Functions/347302: Hi, Im doing functions, and im just STUCK! Were supposted to plug in 9, but then what? thanks! f(x)=7x+-15;f=91 solutions Answer 248338 by edjones(7569)   on 2010-09-23 17:54:54 (Show Source): You can put this solution on YOUR website!f doesn't equal 9, x does or f(x) does.
 Numbers_Word_Problems/347290: i am a number greater then 50. i am an odd number. the digit in the tens place is double the digit in the ones place. the mystery number is?1 solutions Answer 248335 by edjones(7569)   on 2010-09-23 17:49:19 (Show Source): You can put this solution on YOUR website!63
 Polygons/347283: i need to know when a convex polygon is regular. always, never, or sometimes?1 solutions Answer 248333 by edjones(7569)   on 2010-09-23 17:46:23 (Show Source): You can put this solution on YOUR website!sometimes
 Complex_Numbers/347259: absolute value of 5+3i 1 solutions Answer 248331 by edjones(7569)   on 2010-09-23 17:43:47 (Show Source): You can put this solution on YOUR website!Let x=5 and y=3 and use the pythagorean theorem. z=sqrt(x^2+y^2) =sqrt(25+9) =sqrt(34) . Ed
 Numeric_Fractions/346999: How do you solve 1/2+(2/3 / 3/4)-(4/5 * 5/6)?1 solutions Answer 248148 by edjones(7569)   on 2010-09-23 01:29:30 (Show Source): You can put this solution on YOUR website!1/2+(2/3 / 3/4)-(4/5 * 5/6) = 1/2 + 6/12 - 20/30 = 1/2 + 1/2 - 2/3 = 1 - 2/3 = 1/3 . Ed
 Probability-and-statistics/347038: 5. The Centers for Disease Control have determined that when a person is given a vaccine, the probability that the person will develop immunity to a virus is 0.8. If 7 people are given this vaccine, find the probability that a. at least five will develop immunity b. exactly four will develop immunity c. all will develop immunity 1 solutions Answer 248147 by edjones(7569)   on 2010-09-23 01:18:32 (Show Source): You can put this solution on YOUR website!Expand the binomial (a+b)^7, Let a=.8 and b=.2 . c. .8^7=.2097 . b. 35*(.8)^4*(.2)^3=.1147 . a. a^7+7a^6b+21a^5b^2=.852 . Ed
 Linear_Equations_And_Systems_Word_Problems/347044: 1. If 2/3 of employees of a company are women and 1/4 of the remaining employees are married and the rest are 9 bachelors. What is the total number of employees? 2. How would you divide \$40 between two student in the ratio of 3 is to 5? 3. Ice placed in an ice box 15% of its weight before being used. How many tons of ice must be placed in an ice boxes so as to have 850 tons for use? 1 solutions Answer 248146 by edjones(7569)   on 2010-09-23 01:02:44 (Show Source): You can put this solution on YOUR website!Let x be the total number of employees. 2x/3 + (x/3 * 1/4) + 9 = x 2x/3 + x/12 + 9 = x 8x+x+108=12x multiply each side by 12. -3x=-108 x=36 . Ed
 Complex_Numbers/347051: How do you simplify this equation? How Do You Know What Numbers you should use to go into -125? sqrt (-125)1 solutions Answer 248145 by edjones(7569)   on 2010-09-23 00:52:10 (Show Source): You can put this solution on YOUR website!sqrt (-125) =sqrt(25*5)i =5sqrt(5)i . Ed
 Complex_Numbers/346995: estimate 8,932 divided by 4451 1 solutions Answer 248144 by edjones(7569)   on 2010-09-23 00:47:41 (Show Source):
 Numbers_Word_Problems/347007: 24 less than half a number 1 solutions Answer 248143 by edjones(7569)   on 2010-09-23 00:43:55 (Show Source): You can put this solution on YOUR website!Let x be the number. x/2 - 24
 Numeric_Fractions/347008: (a*1 1/2) +a=250 I can't figure out what to do with 1 1/2 1 solutions Answer 248142 by edjones(7569)   on 2010-09-23 00:42:13 (Show Source): You can put this solution on YOUR website!(a * 1 1/2) + a = 250 3a/2 + a = 250 [1 1/2 = 3/2] 3a+2a=500 multiply each side by 2. 5a=500 a=100 . Ed
 Length-and-distance/347010: Find the distance between the pair of points. (3 sqrt(13), -2) and (4 sqrt(13), 4) Answer choices: A. 7 B. 49 C. 49/2 D. 6 *I tried using the distance formula but never came up with one of the answer choices given. Please help and clear things up! Thanks :)1 solutions Answer 248141 by edjones(7569)   on 2010-09-23 00:35:43 (Show Source): You can put this solution on YOUR website!sqrt((4sqrt(13)-3sqrt(13))^2 + (4-(-2))^2) =sqrt((sqrt(13)^2+6^2) =sqrt(13+36) =7 . Ed
 Linear-systems/347013: how do u cancel variable, in a 3 variable equation,that is -6z on top and 0z on bottom1 solutions Answer 248140 by edjones(7569)   on 2010-09-23 00:26:11 (Show Source): You can put this solution on YOUR website!division by zero is not allowed. The variable is undefined. . Ed
 Miscellaneous_Word_Problems/347015: With water from one hose, a swimming pool can be filled in 8 hours. A second, larger hose used alone can fill the pool in 5 hours. How long would it take to fill the pool if both hoses were used simultaneously?1 solutions Answer 248139 by edjones(7569)   on 2010-09-23 00:23:43 (Show Source): You can put this solution on YOUR website!Larger hose fills 1/5 the pool in 1 hr. Smaller hose fills 1/8 the pool in 1 hr. 1/8 + 1/5 = 5/40 + 8/40 =13/40 of the pool filled in 1 hr. 40/13= hrs to fill the pool. . Ed
 Probability-and-statistics/347018: A three digit number is chosen at random. What is the probability that either all the digits are odd or all the digits are even? Assume the first digit is not zero and that zero is even.1 solutions Answer 248138 by edjones(7569)   on 2010-09-22 23:56:47 (Show Source): You can put this solution on YOUR website!If the 1st digit is odd then 1/2 * 1/2 = 1/4 all odd. If the 1st digit is even then 1/2 * 1/2 = 1/4 all even. Since the 1st digit must be either odd or even but not both then 1/4 is the probability that either all the digits are odd or all the digits are even.
 Angles/347019: Angle L and angle M are complementary angles.Angle N and angle P are complementary angles.If angle L=y-2, angle M=2x+3, angle N=2x-y, and angle P=x-1, find the values of x, y, angle L, angle M, angle N, and angle P.1 solutions Answer 248137 by edjones(7569)   on 2010-09-22 23:47:00 (Show Source): You can put this solution on YOUR website!y-2+2x+3=90 2x+y=89 . 2x-y+x-1=90 3x-y=91 . 2x+y=89 3x-y=91 ---------add 5x==180 . x=36 y=17 . Ed
 Linear_Equations_And_Systems_Word_Problems/347021: what multiplier should be used for each of the following equations to eliminate one unknown by subtraction? 3x-y=7, 2x+7y=42. A.)7 for the first equation, 1 for the second B.)6 for the first equation, 7 for the second C.)3 for the first equation, 2 for the second D.)2 for the first equation, 3 for the second1 solutions Answer 248136 by edjones(7569)   on 2010-09-22 23:33:04 (Show Source): You can put this solution on YOUR website!D) 6x-2y=14 6x+21y=42 ---------subtract -23y=-28 . Ed
 absolute-value/347026: if the values of the expressions -11, -1, 9, and 17 are plotted on a number line, which expression would be furthest from 8.1 solutions Answer 248134 by edjones(7569)   on 2010-09-22 23:26:26 (Show Source): You can put this solution on YOUR website!-11 8-(-11)=19 . Ed
 Probability-and-statistics/346564: 1.Some students were asked if they carry a credit card. Here are the responses. Class Credit Card Carrier Not a Credit Card Carrier Total Freshman 33 27 60 Sophomore 6 34 40 Total 39 61 100 What is the probability that the student is a sophomore and doesn't carry a credit card? 2.Some students were asked if they carry a credit card. Here are the responses. Class Credit Card Carrier Not a Credit Card Carrier Total Freshman 33 27 60 Sophomore 6 34 40 Total 39 61 100 What is the probability that the student is a sophomore given he doesn't carry a credit card? 1 solutions Answer 247847 by edjones(7569)   on 2010-09-22 11:05:09 (Show Source): You can put this solution on YOUR website!1. 34/100 = 17/50 = .34 . 2. 34/61 = .557 . Ed
 Complex_Numbers/346606: (7-6i)-(-11-3i)1 solutions Answer 247835 by edjones(7569)   on 2010-09-22 10:42:57 (Show Source): You can put this solution on YOUR website!(7-6i)-(-11-3i) =7-6i+11+3i =18-3i . Ed
 Probability-and-statistics/346633: A student takes a multiple choice test with 10 questions (four answers per question) and guesses at each of the ten. The probability that he gets at least half right?1 solutions Answer 247832 by edjones(7569)   on 2010-09-22 10:35:31 (Show Source): You can put this solution on YOUR website!Expand the binomial (a+b)^10 Let a=.75 and b=.25 a^10=.0563 all wrong 10a^9b=.1877 45a^8b^2=.2816 120a^7b^3=.2503 210a^6b^4=.1460 six wrong ==========>.9219 . 1-.9219=.0781 The probability that he gets at least half right. . Ed
 Numbers_Word_Problems/346609: Can you please help me solve: Write as an absolute value inequality - x is more than 7 units from 3. Thank you.1 solutions Answer 247818 by edjones(7569)   on 2010-09-22 10:16:56 (Show Source): You can put this solution on YOUR website!|-x+3|>7 This is tricky. Let me know if it's correct. . Ed
 test/346401: 12x12x12x12x121 solutions Answer 247688 by edjones(7569)   on 2010-09-21 20:04:15 (Show Source): You can put this solution on YOUR website!Please use "*" for times. 12*12*12*12*12=12^5=248,832
 Permutations/346405: Four wires (red, green, blue, and yellow) need to be attaches to a circuit board. a robotic device will attach the wires. the wires can be attached in any order, and the production manager wishes to determine which order would be fastest for the robot to use. Determine the number of all the posible sequences of assembly that must be tested. 1 solutions Answer 247686 by edjones(7569)   on 2010-09-21 20:00:52 (Show Source): You can put this solution on YOUR website!4!=24
 Numbers_Word_Problems/346403: One positive number is one-fifth of another number. The difference between the two numbers is 244, find the numbers. 1 solutions Answer 247685 by edjones(7569)   on 2010-09-21 19:55:45 (Show Source): You can put this solution on YOUR website!x=y/5 y-x=244 . y - y/5 = 244 Substitute y/5 for x. 5y-y=1220 multiply each side by 5. 4y=1220 y=305 x=61 . Ed