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# Recent problems solved by 'ewatrrr'

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 Numeric_Fractions/668438: what is 6/4 multiply by 4/9 simplified 1 solutions Answer 415547 by ewatrrr(10682)   on 2012-10-18 12:06:48 (Show Source): You can put this solution on YOUR website! Hi,
 Polynomials-and-rational-expressions/668431: x^2+8x=20 A.Add (b/2)^2 to both sides of the equation. B.Factor left side of the equation. 1 solutions Answer 415546 by ewatrrr(10682)   on 2012-10-18 12:05:55 (Show Source): You can put this solution on YOUR website! Hi, x^2+8x=20 x^2+8x + 16 =20 +16 (x + 4)(x+4) = 36 (x+4)^2 = 36
 test/668434: a calculator company donated 500 graphing calculators to a certain school. of the 500, 10 were defective. if a math class received 30 calculators, find the probability that exactly 30 graphing calculators were working properly (i.e. not defective) 1 solutions Answer 415544 by ewatrrr(10682)   on 2012-10-18 12:02:39 (Show Source): You can put this solution on YOUR website! Hi, of the 500 graphing calculators , 10 were defective. non-defective math class received 30 calculators P(all non-def) =
 Mixture_Word_Problems/668428: The cost of 6 bedspreads and 8 pillows is \$448.12. Three bedspreads and 10 pillows cost \$323.00. Find the cost of each bedspread and each pillow. Enter the cost of each pillow in the answer box below1 solutions Answer 415541 by ewatrrr(10682)   on 2012-10-18 11:58:12 (Show Source): You can put this solution on YOUR website! Hi, The cost of 6 bedspreads and 8 pillows is \$448.12. Three bedspreads and 10 pillows cost \$323.00. Find the cost of each bedspread and each pillow. Translate into two equations: 6x + 8y = 448.12 3x + 10y = 323.00 ||Multiply 2nd Eq by -2 and add to 1st EQ to eliminate x -12y = -197.88 y = \$98.94
 Money_Word_Problems/668430: if the reserve rate is 9%and a bank recieves a deposit of 8000 how much of the 8000 is the bank free to lend1 solutions Answer 415538 by ewatrrr(10682)   on 2012-10-18 11:52:29 (Show Source): You can put this solution on YOUR website! Hi, if the reserve rate is 9%and a bank recieves a deposit of 8000 how much of the 8000 is the bank free to lend
 Travel_Word_Problems/668427: a boat takes 3 hours to travel 30 km down a river, then 5 hours to return. how fast is the river flowing?1 solutions Answer 415536 by ewatrrr(10682)   on 2012-10-18 11:51:02 (Show Source): You can put this solution on YOUR website! Hi, a boat takes 3 hours to travel 30 km down a river, then 5 hours to return. how fast is the river flowing? Note: D/t = r r + c = 10 r - c = 6 2r = 16 r = 8 and c = 2kmph, how fast the river is flowing
 Geometry_Word_Problems/668419: The longer leg of a given right triangle is 7ft greater in length than the shorter leg of the triangle. The hypotenuse is 2ft greater in length than the longer leg of the triangle. What are the lengths of the legs of the right triangle? 1 solutions Answer 415531 by ewatrrr(10682)   on 2012-10-18 11:45:08 (Show Source): You can put this solution on YOUR website! Hi, The longer leg of a given right triangle is 7ft greater in length than the shorter leg of the triangle. The hypotenuse is 2ft greater in length than the longer leg of the triangle. Using the Pythagorean Theorem a^2 + b^2 = c^2 a^2 + (a+7)^2 = (a+9)^2 a^2 + a^2 + 14a + 49 = a^2 + 18a + 81 a^2 - 4a - 32 = 0 factoring (a -8)(a + 4) = 0 (a + 4) = 0 , a = -4 ||disregard negative solution for unit measure 0r (a - 8)= 0 , a = 8ft, b = 15ft, c = 17ft and...
 Functions/668417: i am lost on this problem X=-3 what i have to do is state its domain and range. I have to show this in an x/y chart and explain the graphing. how would i do that 1 solutions Answer 415526 by ewatrrr(10682)   on 2012-10-18 11:32:50 (Show Source): You can put this solution on YOUR website! Hi, Re TY, as below(blue line), draw a vertical line up and down at x = -3 x = -3 is a vertical Line. Domain is x = -3 Range is all real numbers
 Linear_Equations_And_Systems_Word_Problems/668424: The sum of three numbers is 137. The second number is 4 more than two times the first number. The third number is 5 less than three times the first number. Find the three numbers. 1 solutions Answer 415523 by ewatrrr(10682)   on 2012-10-18 11:27:47 (Show Source): You can put this solution on YOUR website! Hi, The sum of three numbers, ,&is 137. The second number is 4 more than two times the first number. The third number is 5 less than three times the first number. Translate into an equation: x + y + z = 137 x + + = 137 6x = 138 x = 23 three numbers are: 23, 50, 64 and...
 logarithm/668395: log(x, 2)= -2 log(x, 0.4)= 21 solutions Answer 415522 by ewatrrr(10682)   on 2012-10-18 11:19:50 (Show Source): You can put this solution on YOUR website! Hi, ⇒ ⇒ , x = ⇒ ⇒
 Polynomials-and-rational-expressions/668380: How Do You Solve (2r+3/r-4)(r^2-16/6r+9)1 solutions Answer 415505 by ewatrrr(10682)   on 2012-10-18 10:03:20 (Show Source): You can put this solution on YOUR website! Hi, Note: one 'solves' equations... expressions are 'simplified' if possible
 Miscellaneous_Word_Problems/668340: alex drove 84 miles on 6.5 gallons of gas how many gallons would he need to travel 126 miles?1 solutions Answer 415488 by ewatrrr(10682)   on 2012-10-18 08:20:24 (Show Source): You can put this solution on YOUR website! Hi, alex drove 84 miles on 6.5 gallons of gas how many gallons would he need to travel 126 miles? ||| Cross Multiply to solve for x
 Miscellaneous_Word_Problems/668339: 90 calories in 3/4 cup how many carlories are in 9 cups?1 solutions Answer 415487 by ewatrrr(10682)   on 2012-10-18 08:11:30 (Show Source): You can put this solution on YOUR website! Hi, 90 calories in 3/4 cup how many carlories are in 9 cups? | Cross Multiplying to solve x = 810/.75 = 1080 calories
 logarithm/668369: log base3x 81=21 solutions Answer 415486 by ewatrrr(10682)   on 2012-10-18 08:07:11 (Show Source): You can put this solution on YOUR website! Hi, (3x)^2 = 81 9x^2 = 81 x^2 = 9 x = 3 (tossing out -3 as being an extraneous solution)
 Proportions/668365: if the scale of a park is 1 inch = 20 feet, measuremaent on the map of 6 inches stands for how much distance is the actual park?1 solutions Answer 415485 by ewatrrr(10682)   on 2012-10-18 08:04:23 (Show Source): You can put this solution on YOUR website! Hi, scale of a park is 1 inch = 20 feet,measuremaent on the map of 6 inches stands for how much distance is the actual park ||| Cross Multiply to find x = 120ft
 Travel_Word_Problems/668351: A car averages 400 km per tankful of gasoline. At 70 kilometers per hour, about how many hours can you drive on 2 tankfuls?1 solutions Answer 415484 by ewatrrr(10682)   on 2012-10-18 07:59:21 (Show Source): You can put this solution on YOUR website! Hi, A car averages 400 km per tankful of gasoline.(2 tankfuls, 800km) At 70 kilometers per hour, about how many hours can you drive on 2 tankfuls? = ~11.4hrs
 Travel_Word_Problems/668357: An airplane flies 900 miles against a headwind of 25 miles per hour. The plane took 15 minutes longer for this flight with a tailwind of 25 miles per hour. How fast could the plane fly in still air?1 solutions Answer 415482 by ewatrrr(10682)   on 2012-10-18 07:55:11 (Show Source): You can put this solution on YOUR website! Hi,Previously Posted Note: t = D/r 3600(v+25) - 3600(v-25) = v^2 - 625 7200*25 +625 = v^2 425mph = v and..
 Travel_Word_Problems/668358: An airplane flies 900 miles against a headwind of 25 miles per hour. The plane took 15 minutes longer for this flight with a tailwind of 25 miles per hour. How fast could the plane fly in still air? 1 solutions Answer 415480 by ewatrrr(10682)   on 2012-10-18 07:50:33 (Show Source): You can put this solution on YOUR website! Hi, Note: t = D/r 3600(v+25) - 3600(v-25) = v^2 - 625 7200*25 +625 = v^2 425mph = v and..
 Probability-and-statistics/668360: IQ is normally distributed with mean, u=100, and standard deviation o=20. what is the probability of selecting a random sample of size 100 with mean IQ larger than 105?1 solutions Answer 415476 by ewatrrr(10682)   on 2012-10-18 07:34:33 (Show Source): You can put this solution on YOUR website! Hi, μ = 100 , σ = 20 P(x>105) = 1 - P(x ≤ 105) = 1 - P() = 1 - P(z ≤ 5/2)=.0062
 Number-Line/668001: The fraction 7/12 is found between which pair of fractions on the number line. Write a statement to justify your selection a) 1/4 and 5/16 b) 8/16 and 1/2 c) 1/4 and 1/2 d) 8/16 and 17/241 solutions Answer 415289 by ewatrrr(10682)   on 2012-10-17 16:22:58 (Show Source): You can put this solution on YOUR website! Hi, The fraction 7/12 is found between which pair of fractions on the number line. 7/12 > 1/2 d) 8/16 and 17/24 as this goes from 1/2 to over 2/3
 Graphs/667985: How to graph m:12, y-intercept:4/5?1 solutions Answer 415287 by ewatrrr(10682)   on 2012-10-17 16:14:36 (Show Source): You can put this solution on YOUR website! Hi, Using the standard slope-intercept form for an equation of a line y = mx + b where m is the slope and b the y-intercept. m:12, y-intercept:4/5 y = 12x + 4/5 (0,4/5) and (-1/15,0) the intercepts Plot Pts and connect with the Line
 Quadratic_Equations/667973: 5- Show work, answer the following for the given quadratic function. F(x)=x²-4x+4 a- What is the vertex (h,k) of f? Simplify your answer(type an ordered pair) b- What is the axis of symmetry? The axis of symmetry is Type an equation simplify answer, use integers or fractions for any numbers in the equation c- What are the interepts? The intercepts are? Type an ordered pair, use a comma to separate answers as needed d- What is the domain of f? e- What is the range of f? f- On what interval is f increasing? g- On what interval is f degreasing? h- Graph 1 solutions Answer 415285 by ewatrrr(10682)   on 2012-10-17 16:10:49 (Show Source): You can put this solution on YOUR website! Hi, vertex(2,-8) and line of symmetry x = 2 and intercepts shown Range: F(x) ≥ -8, Domain: x all real numbers f Increaseing ( 2,∞ ) and f is decreasing(−∞,2) F(x) = x^2 - 4x- 4 = x^2 - 4x + 4 - 4 - 4 = (x-2)^2 - 8
 Probability-and-statistics/667969: A school code consists of two letters followed by 3 digits. The first letter must be K, F, S, T, U, or I. How many codes meet this description? How many codes meet the additional restrictions: no repeated letter, and no digit can be the 0 digit?1 solutions Answer 415283 by ewatrrr(10682)   on 2012-10-17 15:56:44 (Show Source): You can put this solution on YOUR website! Hi, A school code consists of two letters followed by 3 digits. The first letter must be one of letters: K, F, S, T, U, or I. How many codes meet this description? How many codes meet the additional restrictions: no repeated letter, and no digit can be the 0 digit?
 Coordinate-system/667961: -12x + 4y = 12 1 solutions Answer 415282 by ewatrrr(10682)   on 2012-10-17 15:51:08 (Show Source): You can put this solution on YOUR website! Hi, -12x + 4y = 12 y = 3x + 3
 Equations/667967: Please help me solve this equation : 2d+6=3(d-3)1 solutions Answer 415281 by ewatrrr(10682)   on 2012-10-17 15:49:27 (Show Source): You can put this solution on YOUR website! Hi, Re TY 'combining' the d terms requires -2d to be added to both sides 2d+6=3(d-3) 2d + 6 = 3d - 9 ||Adding 9 and -2d to both sides of the EQ 15 = d and..
 Exponents/667964: one six to the 5th power1 solutions Answer 415280 by ewatrrr(10682)   on 2012-10-17 15:47:54 (Show Source): You can put this solution on YOUR website! Hi,
 Rectangles/667960: If the perimeter of a rectangle is 36 inches and the width is two less than three times the length, what is the equation?1 solutions Answer 415279 by ewatrrr(10682)   on 2012-10-17 15:46:25 (Show Source): You can put this solution on YOUR website! Hi, width is two less than three times the length, what is the equation? P= 2L + 2W = 36" L + W = 18" x + (3x-2) = 18" , x = 5" , the length and width is 13"
 Percentage-and-ratio-word-problems/667953: The price of a satellite radio at Store A is 29/20 the price at Store B. The price at Store A is 150.81 solutions Answer 415278 by ewatrrr(10682)   on 2012-10-17 15:42:09 (Show Source): You can put this solution on YOUR website! Hi, Previously Posted The price of a radio at Store A is 29/30 the price at Store B. = \$156
 Percentage-and-ratio-word-problems/667954: The price of a radio at Store A is 29/30 the price at Store B. The price at Store A is \$150.80 What is the price of the radio at Store B1 solutions Answer 415277 by ewatrrr(10682)   on 2012-10-17 15:41:24 (Show Source): You can put this solution on YOUR website! Hi, The price of a radio at Store A is 29/30 the price at Store B. = \$156
 Linear-equations/667949: GRAPH THE LINE THAT PASSES THROUGH (-9/2 , 4) AND HAS AN UNDEFINED SLOPE. PLOT 2 POINTS ON THE LINE1 solutions Answer 415276 by ewatrrr(10682)   on 2012-10-17 15:37:58 (Show Source): You can put this solution on YOUR website! Hi, line with an 'undefined' slope is a vertical Line passing thu (-9/2,4) x = -9/2
 Age_Word_Problems/667903: Tom found the sum of 9 and 4 by using ten. 2nd grade math riddle HELP!!!!1 solutions Answer 415275 by ewatrrr(10682)   on 2012-10-17 15:33:49 (Show Source): You can put this solution on YOUR website! Hi, If I am understanding correctly 9 + 4 = 9 + 1 + 3 = 10 + 3 = 13