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# Recent problems solved by 'Alan3354'

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 test/580117: I don't understand how to solve systems of equations???1 solutions Answer 371140 by Alan3354(30993)   on 2012-02-29 14:53:05 (Show Source): You can put this solution on YOUR website!I don't understand how to solve systems of equations??? ------------ A lot of people don't. Some do.
 Polynomials-and-rational-expressions/580087: How do you Solve the equation 3(m+1)+2(m+2)=52 ?????? 1 solutions Answer 371139 by Alan3354(30993)   on 2012-02-29 14:20:13 (Show Source): You can put this solution on YOUR website!How do you Solve the equation 3(m+1)+2(m+2)=52 ?????? ---------- 3(m+1) = 3m+3 Multiply the other binomial by the 2. Collect terms. Isolate m.
 Polynomials-and-rational-expressions/580101: This question has been driving me crazy for the last three hours. I don't get it. Factor 2m2 + 27m + 70. The answers given are the same (just in a different order) and I don't have a both button. I don't understand and I would LOVE an explanation as soon as possible. 1 solutions Answer 371138 by Alan3354(30993)   on 2012-02-29 14:14:39 (Show Source): You can put this solution on YOUR website!Factor 2m2 + 27m + 70 ------------
 Quadratic-relations-and-conic-sections/580072: Please help solve this equation (y-3)^2/25 - (x-2)^2/16 =11 solutions Answer 371137 by Alan3354(30993)   on 2012-02-29 14:00:47 (Show Source): You can put this solution on YOUR website!Please help solve this equation (y-3)^2/25 - (x-2)^2/16 = 1 ----------- You have 1 eqn with 2 variables, x & y. There are an infinite # of solutions. Pick a value for x and find y.
 Expressions-with-variables/580080: If sailcloth costs \$10 per square foot, what is the cost of a new mainsail? Before solving this problem let's review the Pythagorean Theorem. This theorem relates the lengths of the three sides of a right triangle. A right triangle has a 90º angle. The side opposite the 90º angle is called the hypotenuse and the other sides are called legs. The Pythagorean theorem states that for every right triangle, the sum of the squares of the legs is equal to the square of the hypotenuse. a2 + b2 = c2 Now solve the problem: The mainsail on the sailboat shown below is a right triangle in which the hypotenuse is called the leech. If sailcloth costs \$10 per square foot, what is the cost of a new mainsail? Hint: To find the cost of the sail, you need to know the area of the sail. You must first find the base (x) of the mainsail using the Pythagorean Theorem. Once you have found the value of x then find the area of the sail by using the formula for the area of a triangle: 1/2 base times height; A= ½bh . x Leech IS 13 ft 12 ft tHIS IS A HUGE PART OF MY GRADE!! I NEED HELP.. i DO NOT EVEN KNOW HOW TO WRITE IT OUT.1 solutions Answer 371136 by Alan3354(30993)   on 2012-02-29 13:44:03 (Show Source): You can put this solution on YOUR website!If the hypotenuse is 13 and one side is 12, the 3rd side is 5 feet. -------- Area = b*h/2 = 5*12/2 = 30 sq ft ------ \$10*30 = \$300 =================== We don't need the reviews.
 Circles/580083: Find the arc length of a sector that is 125° and has a radius of 20 in. Question 6 answers1 solutions Answer 371135 by Alan3354(30993)   on 2012-02-29 13:40:39 (Show Source): You can put this solution on YOUR website!Find the arc length of a sector that is 125° and has a radius of 20 in. -------------------
 Numeric_Fractions/580067: How to break down 9 over 7 times 4 over 31 solutions Answer 371134 by Alan3354(30993)   on 2012-02-29 13:29:48 (Show Source): You can put this solution on YOUR website!How to break down 9 over 7 times 4 over 3 ----------- I don't know of a math operation called "break down."
 Linear-systems/580030: 6x+5y=-33 3x+2y=-15 Solve by addition method. How is this done when a variable is not canceled out? What is the solution set?1 solutions Answer 371127 by Alan3354(30993)   on 2012-02-29 11:46:40 (Show Source): You can put this solution on YOUR website!6x+5y=-33 3x+2y=-15 --------- Multiply the 2nd eqn by -2, then add.
 logarithm/580034: Solve the equation 91n 3x = 81. Express the answer in terms of e1 solutions Answer 371126 by Alan3354(30993)   on 2012-02-29 11:44:59 (Show Source): You can put this solution on YOUR website!91n 3x = 81 ln(3x) = 9
 logarithm/579997: Logbase2 x = 51 solutions Answer 371123 by Alan3354(30993)   on 2012-02-29 11:24:55 (Show Source): You can put this solution on YOUR website! --> x = 32
 Numbers_Word_Problems/580015: If the sum of three consecutive negative odd integers is -141, find the smallest one.1 solutions Answer 371122 by Alan3354(30993)   on 2012-02-29 11:19:51 (Show Source): You can put this solution on YOUR website!If the sum of three consecutive negative odd integers is -141, find the smallest one. ----------- -141/3 = -47, the middle number
 Travel_Word_Problems/579952: If you drove on a straight road, nonstop, at 65 mph, approximately how long would it take to drive from the Sun? 4 years 164 years 1064 years 10,064 years 1 solutions Answer 371121 by Alan3354(30993)   on 2012-02-29 11:10:17 (Show Source): You can put this solution on YOUR website!If you drove on a straight road, nonstop, at 65 mph, approximately how long would it take to drive from the Sun? ---------- You didn't give the distance, so use 93,000,000 miles d = r*t t = d/r t = 9.3E7/65 hrs *(1/24) day/hr * (1/365 yr/day) t =~ 163 years
 Polynomials-and-rational-expressions/579986: how do i find the cubed root of N squared 850= cubed root of n squared 1 solutions Answer 371119 by Alan3354(30993)   on 2012-02-29 11:05:54 (Show Source): You can put this solution on YOUR website!850= cubed root of n squared ------- Cube both sides n =~ 24781.54555
 Volume/579973: An aquarium is 30 inches long, 15 inches high, and 12 inches wide. What is the volume of the aquarium?1 solutions Answer 371118 by Alan3354(30993)   on 2012-02-29 10:55:19 (Show Source): You can put this solution on YOUR website!An aquarium is 30 inches long, 15 inches high, and 12 inches wide. What is the volume of the aquarium? Vol = 30*15*12 cubic inches
 Travel_Word_Problems/579987: A train went 400 miles from city A to city B at a speed of 80 mph . At what speed should it travel on the way back if wants to have an average speed of 96 mph for the entire round-trip journey ? I got answer 112. x = 2nd speed. (80+x)/2=96 x = 112 but some say it should be 120. How? Thanks. 1 solutions Answer 371115 by Alan3354(30993)   on 2012-02-29 10:45:39 (Show Source): You can put this solution on YOUR website!A train went 400 miles from city A to city B at a speed of 80 mph . At what speed should it travel on the way back if wants to have an average speed of 96 mph for the entire round-trip journey ? I got answer 112. x = 2nd speed. (80+x)/2=96 x = 112 but some say it should be 120. How? --------------------------- Averaging two speeds like that, (s1 + s2)/2 doesn't work, because more time is spent moving at the lower speed. ------------ A train went 400 miles from city A to city B at a speed of 80 mph . At what speed should it travel on the way back if wants to have an average speed of 96 mph for the entire round-trip journey ? ------------ It went 400 miles at 80 mi/hr = 5 hours 800 miles @ 96 mi/hr = 800/96 = 25/3 hours for the round trip. 25/3 - 5 = 10/3 hours to return 400 mi/(10/3)hr = 120 mi/hr ---------------- PS The avg speed of a round-trip (or 2 equal distances) is 2*v1*v2/(v1 + v2) where v1 and v2 are the 2 speeds. For this one, avg = 2*80*120/(80 + 120) = 96 mi/hr
 Geometry_Word_Problems/579958: one circular table has a diameter of 9ft and another circular table has a diamter of 20ft. how much greater is the larger table 1 solutions Answer 371107 by Alan3354(30993)   on 2012-02-29 09:18:46 (Show Source): You can put this solution on YOUR website!one circular table has a diameter of 9ft and another circular table has a diamter of 20ft. how much greater is the larger table ------------------- How much greater what? Circumference = pi*d C9 = 9pi C20 = 20pi ------------ A9 = 81pi/4 = 20.25 sq ft A20 = 100pi sq ft -------- The area of the 20ft is (20/9)^2 times the area of the 9 ft. The difference in area = 100pi - 20.25pi = 79.75pi sq ft
 Exponents/579425: please help me solve this problem need to show work, I have worked this 4 times and it is always wrong1 solutions Answer 371000 by Alan3354(30993)   on 2012-02-28 13:52:35 (Show Source): You can put this solution on YOUR website!please help me solve this problem need to show work, I have worked this 4 times and it is always wrong ------------ It's already solved, y = -2 ----- If you mean evaluate the polynomial at y = -2: at y= -2 = = 96 + 40 - 6 + 1 = 131
 Linear-equations/579439: URGENT!!! PLEASE SOLVE! Solve the system of equations. Make sure to check your solution. y = x + 4 y = 3x THANK YOU !1 solutions Answer 370997 by Alan3354(30993)   on 2012-02-28 13:47:03 (Show Source): You can put this solution on YOUR website!y = x + 4 y = 3x ------------- Since they both equal y, x + 4 = 3x
 Polygons/579452: if there is a regular polygon and each angle is 170 degrees then how many sides does the polygon have?1 solutions Answer 370995 by Alan3354(30993)   on 2012-02-28 13:45:33 (Show Source): You can put this solution on YOUR website!if there is a regular polygon and each angle is 170 degrees then how many sides does the polygon have? ------------------- Exterior angles = 180 - 170 = 10 degs # of sides = 360/10 = 36
 Geometry_Word_Problems/579457: what is the equation to 4)5x+8+3p) show all work?1 solutions Answer 370994 by Alan3354(30993)   on 2012-02-28 13:44:02 (Show Source): You can put this solution on YOUR website!what is the equation to 4)5x+8+3p) show all work? what is the equation to 4)5x+8+3p) ??? makes no sense.
 Travel_Word_Problems/579433: If a man drives 220 miles in 330 minutes, what was his average speed?1 solutions Answer 370992 by Alan3354(30993)   on 2012-02-28 13:41:44 (Show Source): You can put this solution on YOUR website!If a man drives 220 miles in 330 minutes, what was his average speed? ------------ d = r*t r = d/t = 220/330 r = 2/3 mi/minute
 Numeric_Fractions/579020: multiply fractions: (12/25)*(15/4)?1 solutions Answer 370828 by Alan3354(30993)   on 2012-02-27 18:04:35 (Show Source): You can put this solution on YOUR website!(12/25)*(15/4)? ---------------- Multiply the numerators. Multiply the denominators. Reduce if possible.
 logarithm/578743: please help me solve this equation 1 solutions Answer 370750 by Alan3354(30993)   on 2012-02-27 09:39:40 (Show Source): You can put this solution on YOUR website!please help me solve this equation -------------- It's not an equation, there's no equal sign. Solve for what? There's no variable. -------- You can evaluate it, or simplify it. --> ------------------ Remember that the log is the exponent. So, 2 to what exponent = 2^(1/2) ? --> 1/2
 Rational-functions/578737: How would you solve this Rational Function: (X^2+5x+6)/(x^2+6x+8) 1 solutions Answer 370747 by Alan3354(30993)   on 2012-02-27 09:36:16 (Show Source): You can put this solution on YOUR website!How would you solve this Rational Function: (X^2+5x+6)/(x^2+6x+8) --------------- It's not an equation, so it's not to be solved. It can be simplified. Factor the NUM and DEN and cancel any common factors.
 test/578735: this is so confusing please help find the indicated outputs for f(x)=4x to the 2nd power-4x. f(0)= f(-1)= f(2)=1 solutions Answer 370745 by Alan3354(30993)   on 2012-02-27 09:28:46 (Show Source): You can put this solution on YOUR website!find the indicated outputs for f(x)=4x to the 2nd power-4x ------------------- f(0)= Sub 0 for x f(0) = 4*0^2 - 4*0 = 0 ------------------ f(-1) Sub -1 for x f(-1) = 4*(-1)^2 - 4*(-1) = 4+4 = 8 -------------------- f(2)= Sub 2 for x That's all it is.
 Vectors/578401: Find the angle between the vectors i-j and j-k1 solutions Answer 370640 by Alan3354(30993)   on 2012-02-26 18:14:02 (Show Source):
 Angles/578322: a has a degree of 42 if b and a are complementary what is b's angle1 solutions Answer 370627 by Alan3354(30993)   on 2012-02-26 17:23:45 (Show Source): You can put this solution on YOUR website!Hint: a + b = 90 degs
 Polynomials-and-rational-expressions/578368: Factor: 15x^+3+14x1 solutions Answer 370620 by Alan3354(30993)   on 2012-02-26 17:07:45 (Show Source): You can put this solution on YOUR website!Factor: 15x^+3+14x --------------
 Linear-equations/578366: Determine wheter (-8,1) is a solution for 9x+4y=11 solutions Answer 370619 by Alan3354(30993)   on 2012-02-26 17:06:17 (Show Source): You can put this solution on YOUR website!Determine wheter (-8,1) is a solution for 9x+4y=1 -------------- Sub -8 for x and 1 for y, and see.
 Travel_Word_Problems/578359: Albert Einstein also showed that the weight (mass) of an object increases when travelling near the speed of light. If a persons weight on earth is Wo, then the same persons weight W in a spaceship travelling at velocity V is W(V) = Wo divided by the square root of 1-(v/c)squared A) evaluate W when v=0.6c and Wo= 220 B) interpret your result1 solutions Answer 370616 by Alan3354(30993)   on 2012-02-26 17:00:09 (Show Source): You can put this solution on YOUR website!Albert Einstein also showed that the weight (mass) of an object increases when travelling near the speed of light. Actually, he showed that mass increases with speed. ------------------- If a persons weight on earth is Wo, then the same persons weight W in a spaceship travelling at velocity V is W(V) = Wo divided by the square root of 1-(v/c)squared A) evaluate W when v=0.6c and Wo= 220 W = 220/sqrt(0.64) = 220/0.8 W = 275 ---------------- B) interpret your result The faster you go, the more your mass.
 Rate-of-work-word-problems/578356: I need to translate this statement into symbols. "The number of hours it takes to paint a house is inversely proportional to the number of people painting." I believe the answer is "t equals n over k" N being the number of workers and T being the numbers of house.1 solutions Answer 370612 by Alan3354(30993)   on 2012-02-26 16:54:13 (Show Source): You can put this solution on YOUR website!I need to translate this statement into symbols. "The number of hours it takes to paint a house is inversely proportional to the number of people painting." I believe the answer is "t equals n over k" N being the number of workers and T being the numbers of house. -------------------- t = k/n I think t = # of hours k = a constant, varies with the size of the house n = # of people --> more people working means fewer hours -------------------------- T being the numbers of house. The address? What "numbers of house." ?