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# Recent problems solved by 'Alan3354'

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 percentage/600033: HELPPPPPPPPPPPPPPP~!!!!!!!!! Hello I want to know what my overall GPA would be for my class.I think i messed up on the final exam:Ugh! Midterm =25%------> 76% Quizes and HomeWork= 25%------->90,100,100,75,66 Final Exam=50%!!:( Suppose I got a 30% What would be my Overall grade?1 solutions Answer 379157 by Alan3354(30993)   on 2012-04-17 09:40:08 (Show Source): You can put this solution on YOUR website!Hello I want to know what my overall GPA would be for my class.I think i messed up on the final exam:Ugh! Midterm =25%------> 76% Quizes and HomeWork= 25%------->90,100,100,75,66 Final Exam=50%!!:( Suppose I got a 30% What would be my Overall grade? ----------------- Quizes and HomeWork= 25%------->90,100,100,75,66 Average = (90 + 100 + 100 + 75 + 66)/5 = 86.2 --------------- If you got 30% Overall avg = (25*76 + 25*86.2 + 50*30)/100 = (1900 + 2155 + 1500)/100 = 55.55%
 logarithm/600020: evaluate log2 1.81 solutions Answer 379151 by Alan3354(30993)   on 2012-04-17 09:07:59 (Show Source): You can put this solution on YOUR website!evaluate log2 1.8 ------- or ln(1.8)/ln(2)
Expressions-with-variables/599889: If six times the square of a number is diminished by ten times the number, the result it 304. What is the number?
what i tried to work out--
6n2 -10n-304= 0
then i tried to use the quadratic equation, but im not sure if it is right..
1 solutions

Answer 379126 by Alan3354(30993)   on 2012-04-16 22:56:10 (Show Source):
You can put this solution on YOUR website!
If six times the square of a number is diminished by ten times the number, the result it 304. What is the number?
what i tried to work out--
6n2 -10n-304= 0
-------------
 Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc) Quadratic equation (in our case ) has the following solutons: For these solutions to exist, the discriminant should not be a negative number. First, we need to compute the discriminant : . Discriminant d=7396 is greater than zero. That means that there are two solutions: . Quadratic expression can be factored: Again, the answer is: 8, -6.33333333333333. Here's your graph:

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 Polynomials-and-rational-expressions/599856: How do you factor 2x squared -15x-27 ?1 solutions Answer 379117 by Alan3354(30993)   on 2012-04-16 21:39:51 (Show Source): You can put this solution on YOUR website!How do you factor 2x squared -15x-27 ? -------- The factors will be (x + a)*(2x + b) The signs of a & b will be different since the product is -27 ---- Find a & b that give the -15x ----- Someone doing it for you doesn't accomplish anything.
 Length-and-distance/599855: Question: You would like to buy a wheels for your child's wagon so that the wheels roll 1 meter in a full revolution. What should be the approximate diameter? Give the answer in decimeters rounded to the nearest hundredth.1 solutions Answer 379116 by Alan3354(30993)   on 2012-04-16 21:37:50 (Show Source): You can put this solution on YOUR website!C = pi*d d = 1/pi meters d = 10/pi decimeters
 Linear_Equations_And_Systems_Word_Problems/599846: Ann has some dimes and quarters. if she has 25 coins worth 4.45 how many of each type does she have? 1 solutions Answer 379115 by Alan3354(30993)   on 2012-04-16 21:36:51 (Show Source): You can put this solution on YOUR website!Ann has some dimes and quarters. if she has 25 coins worth 4.45 how many of each type does she have? ---------------------------- If she had 25 dimes, she'd have \$2.50 Each dime replace by a quarter adds 15 cents 445 - 250 = 195 195/15 = 13 quarters 10 dimes ------------- The hard way: d + q = 25 10d + 25q = 445 etc Same answer
 Rational-functions/599802: How would you find the domain of (1/x)/((x-1)/(x-4)) Thank you1 solutions Answer 379106 by Alan3354(30993)   on 2012-04-16 21:16:42 (Show Source): You can put this solution on YOUR website!How would you find the domain of (1/x)/((x-1)/(x-4)) ------------ = The domain is all real numbers, except the numbers that make the expression undefined. The numbers excluded are 0 & 1
 logarithm/599819: evaluate x to four decimal places. a. logx=1.9168 b. Inx=5.08841 solutions Answer 379105 by Alan3354(30993)   on 2012-04-16 21:10:49 (Show Source): You can put this solution on YOUR website!evaluate x to four decimal places. a. logx=1.9168 Use a calculator ------------- b. Inx=5.0884 It's ln(x), for natural log, not In. ln(x) = 5.0884 x = e^5.0884 Back to the calculator
 Expressions-with-variables/599822: If 2x^2-11x= -5, then x = There will two values for the answer1 solutions Answer 379104 by Alan3354(30993)   on 2012-04-16 21:08:53 (Show Source): You can put this solution on YOUR website!If 2x^2-11x= -5 You can factor it, or use the quadratic equation.
 Expressions-with-variables/599832: If 4x^2+24=20x, then x= There will be two values for the answer1 solutions Answer 379103 by Alan3354(30993)   on 2012-04-16 21:06:57 (Show Source): You can put this solution on YOUR website!If 4x^2+24=20x, then x= -------- 4x^2+24-20x = 0 x^2 - 5x + 6 = 0 (x-2)*(x-3) = 0 x = 2,3
 decimal-numbers/599836: How to find the answer to 8/1.11 solutions Answer 379100 by Alan3354(30993)   on 2012-04-16 21:04:39 (Show Source): You can put this solution on YOUR website!How to find the answer to 8/1.1 ----------- Using a calculator is one way.
 Surface-area/599648: Find the surface area of a cuboid (3cm by 3cm by 13cm) 1 solutions Answer 379079 by Alan3354(30993)   on 2012-04-16 19:34:36 (Show Source): You can put this solution on YOUR website!Find the surface area of a cuboid (3cm by 3cm by 13cm) ---------- SA = 2*(3*3 + 3*13 + 3*13) = 2*(9 + 39 + 39) = 174 sq cm
 Numeric_Fractions/599660: What is the answer to 1 7/8 times 1 2/9? :D1 solutions Answer 379078 by Alan3354(30993)   on 2012-04-16 19:32:54 (Show Source): You can put this solution on YOUR website!What is the answer to 1 7/8 times 1 2/9? ----- = (15/8)*(11/9) = 165/72 = 55/24
 Geometric_formulas/599703: the circumference of a circle is 12m. find the length of a radius of the circle. Round to the nearest hundredth. I really do not understand1 solutions Answer 379077 by Alan3354(30993)   on 2012-04-16 19:30:16 (Show Source): You can put this solution on YOUR website!the circumference of a circle is 12m. find the length of a radius of the circle. Round to the nearest hundredth. -------- Use a calculator r =~ 1.91 m
 Age_Word_Problems/599747: Joshua is 12 years old and his sister is three times as old as he. When Joshua is 23 years old, how old will his sister be?1 solutions Answer 379075 by Alan3354(30993)   on 2012-04-16 19:26:13 (Show Source): You can put this solution on YOUR website!Joshua is 12 years old and his sister is three times as old as he. When Joshua is 23 years old, how old will his sister be? J is 12 S is 36 ----- Add 11 S is 47
 test/599782: (cube root of x - 8)+2 =1 I subtracted 2 from both sides, then cubed both sides, ending up with x - 8 = -1. Added 8 to both sides and came up with x=7 but my teacher counted it wrong?1 solutions Answer 379074 by Alan3354(30993)   on 2012-04-16 19:24:06 (Show Source): You can put this solution on YOUR website!(cube root of x - 8)+2 =1 ------ x-8 = -1 x = 7 Looks right to me.
 Exponents/599765: This is a scientific notation what is 4.o times 10^-3 subtracted by 2.5 times 10^-31 solutions Answer 379064 by Alan3354(30993)   on 2012-04-16 19:01:07 (Show Source): You can put this solution on YOUR website!This is a scientific notation what is 4.o times 10^-3 subtracted by 2.5 times 10^-3 -------- If you mean If the exponents are the same, you just subtract.
 Polynomials-and-rational-expressions/599742: What is the factor to b squared + 16b + 63 ?1 solutions Answer 379052 by Alan3354(30993)   on 2012-04-16 18:22:54 (Show Source): You can put this solution on YOUR website!What is the factor to b squared + 16b + 63 ----------- Hint: find factors of 63 that add to 16.
 Exponents/599629: -2x + -^2x= 4 HOW does this make sense? Its on a pre test for the college entrance test. It doesn't make sense does it? It has me stumped, and I am probably not realizing something that is really obvious. But using brackets, it does not WORK OUT to equal 4?????1 solutions Answer 379023 by Alan3354(30993)   on 2012-04-16 15:56:50 (Show Source): You can put this solution on YOUR website!-2x + -^2x= 4 ---------- What is -^2x ?
 Sequences-and-series/599642: Find the number of terms. Use the sum formula. 1+2+4+...+2048 2048=1*2^n-1 2048=2^n-1 I don't know where to go from here. 1 solutions Answer 379022 by Alan3354(30993)   on 2012-04-16 15:54:29 (Show Source): You can put this solution on YOUR website!Find the number of terms. Use the sum formula. 1+2+4+...+2048 2048=1*2^n-1 2048=2^n-1 I don't know where to go from here. -------
 Polynomials-and-rational-expressions/599558: Solve the equation by a method of your choice: x2 - 6x + 5 = 0 If there are two solutions, separate the solutions by a comma. my answer for this was (5, 1), i got it wrong did i forget to write something in or is the answer wrong, what would be the right answer?1 solutions Answer 379009 by Alan3354(30993)   on 2012-04-16 11:44:39 (Show Source): You can put this solution on YOUR website!Solve the equation by a method of your choice: x2 - 6x + 5 = 0 If there are two solutions, separate the solutions by a comma. my answer for this was (5, 1), i got it wrong did i forget to write something in or is the answer wrong, what would be the right answer? ----------- (5,1) is a point x = 5, 1 or x = 1, 5 is expected.
 Linear-equations/599544: given a line 2x-4y=8 y-intercept? (set x=0) x-intercept (set y=0)1 solutions Answer 379008 by Alan3354(30993)   on 2012-04-16 11:43:55 (Show Source): You can put this solution on YOUR website!given a line 2x-4y=8 y-intercept? (set x=0) 2*0 - 4y = 8 y = -2 or (0,-2) ------------------- x-intercept (set y=0) Do it like the one above.
 Polynomials-and-rational-expressions/599556: Solve the equation by a method of your choice: 6x2 + 5x + 1 = 0 If there are two solutions, separate the solutions by a comma. my aswer was (3x + 1)(2x + 1) = 0 and i got it wrong, did i forget to put something or is the answer wrong?1 solutions Answer 379007 by Alan3354(30993)   on 2012-04-16 11:41:44 (Show Source): You can put this solution on YOUR website!Solve the equation by a method of your choice: 6x2 + 5x + 1 = 0 If there are two solutions, separate the solutions by a comma. my aswer was (3x + 1)(2x + 1) = 0 ------------- The answers will be x = something. (3x + 1)(2x + 1) = 0 If the product is zero, either (3x + 1) = 0 x = -1/3 or (2x + 1) = 0 x = -1/2 ------------ x = -1/3, -1/2
 Surface-area/599520: A contractor agrees to build a dam 180ft long and 20fthigh12ftwide at the bottom and 8ftwide at the top for 9.75 a cubic yard Find his profit if his costs were 10000?1 solutions Answer 379006 by Alan3354(30993)   on 2012-04-16 11:33:20 (Show Source): You can put this solution on YOUR website!A contractor agrees to build a dam 180ft long and 20fthigh12ftwide at the bottom and 8ftwide at the top for 9.75 a cubic yard Find his profit if his costs were 10000? ------------------ Find the volume. Vol = area of the trapezoid x the length = L*h*(20+8)/2 = 180*20*14 = 50400 cubic ft 50400/27 = 1866.67 cubic yards ---- Price = Vol*\$9.75 = \$17864 - \$10000 = \$7864 profit
 Polygons/599549: If the measure of an exterior angle of a regular polygon is 72°, what type of polygon is it? 1 solutions Answer 379004 by Alan3354(30993)   on 2012-04-16 11:23:09 (Show Source): You can put this solution on YOUR website! If the measure of an exterior angle of a regular polygon is 72°, what type of polygon is it? ------------- 360/72 = 5 sides