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Recent problems solved by 'checkley77'

checkley77 answered: 12560 problems
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Radicals/147866: 4x+34x+42 it says factor completely can u show me how 1 solutions Answer 108237 by checkley77(12569)   on 2008-07-10 20:37:37 (Show Source): You can put this solution on YOUR website! 4x+34x+42 38x+42 2(19x+21) answer.

Square-cubic-other-roots/147817: PLEASE HELP ME FIND THE INDICATED ROOTS A. 144X^2Y^2 B. (81)^1/3 C. (8)^1/3 D.(27X^6Y^3)^1/3 1 solutions Answer 108208 by checkley77(12569)   on 2008-07-10 16:04:59 (Show Source): You can put this solution on YOUR website! A. 144X^2Y^2 (NO ROOTS INDICATED.) IF (144X^2Y^2)^1/2 THEN: 12XY B. (81)^1/3 4.32675 C. (8)^1/3 2 D.(27X^6Y^3)^1/3 3X6^2Y

Equations/147566: 5-(4-1)2+3(-2-1) both the 5 and the 1 in the 2nd set of parenthases are squared 1 solutions Answer 108207 by checkley77(12569)   on 2008-07-10 15:45:59 (Show Source): You can put this solution on YOUR website! 5^2-(4-1)2+3(-2-1^2) 25-3*2+3(-2+1) 25-6+3*-1 25-6-3 25-9=16 ANSWER.

Money_Word_Problems/147795: How much should be invested at 8% compounded semiannually in order to have $5000 at the end of 8 years. 1 solutions Answer 108206 by checkley77(12569)   on 2008-07-10 15:40:52 (Show Source): You can put this solution on YOUR website! X(1+.08)^8=5000 X(1.08)^8=5000 1.85X=5000 X=5000/1.85 X=$2,702.70 IS THE AMOUNT INVESTED.

Equations/147834: simplify by removing factors of 1 1280v6z4 ________ 100v3z2 simplified form is? 1 solutions Answer 108205 by checkley77(12569)   on 2008-07-10 15:33:26 (Show Source): You can put this solution on YOUR website! 1280v6z4 ________ = 12.8v^3z^2 100v3z2

Inequalities/147729: The members of a drama club are selling tickets to their next production. If their goal is to raise at least $350 the number of tickets they must sell at $2.20 each in order to meet their goal can be expressed by the inequality 2.20x>350. Is 163 a solution of the inequality? 1 solutions Answer 108110 by checkley77(12569)   on 2008-07-09 17:16:47 (Show Source): You can put this solution on YOUR website! 2.20x>350 x>350/2.20 x>159.0909 Thus any amount of 160 or more tickets is a solution.

Percentage-and-ratio-word-problems/147519: How do you write a ratio division word problem for 4/5 divided by 1/2? 1 solutions Answer 107937 by checkley77(12569)   on 2008-07-08 13:40:13 (Show Source): You can put this solution on YOUR website! (4/5)/(1/2)=(4/5)(2/1)=8/5

Systems-of-equations/147408: An airplane flew for 3 hours with a tail wind of 40 km/hr. The Return flight against the same wind took 4 hours. Find The Speed of the airplane in still air. 1 solutions Answer 107841 by checkley77(12569)   on 2008-07-07 15:11:31 (Show Source): You can put this solution on YOUR website! D=RT SEEING AS THE DISTANCES ARE THE SAME WE HAVE: (R+40)3=(R-40)4 3R+120=4R-160 3R-4R=-160-120 -R=-280 R=280 KM/HR THE PLANES SPEED IN STILL AIR.

Mixture_Word_Problems/147450: If grade A coffee costs .95 cents a pound and grade b coffee costs .75 cents a pound, how many pounds of each grade is needed if the total cost is $50.50, and the amount of grade b that is needed is twice the amount needed for grad A plus 5 pounds? 1 solutions Answer 107839 by checkley77(12569)   on 2008-07-07 15:05:40 (Show Source): You can put this solution on YOUR website! .95x+.75(2x+5)=50.50 .95x+1.5x+3.75=50.50 2.45x=50.50-3.75 2.45x=46.75 x=46.75/2.45 19.08 lbs. of $.95 coffee is used 2*19.08+5=43.16 lbs. of $.75 coffee is used proof .95*19.08+.75*43.16=50.50 18.13+32.37 50.50=50.50

Linear-systems/147355: Hi, I dont know what Im doing wrong I need help please. Here is the question: One year ago you invested $4300 into three accounts that earn 3.25%, 4%, and 5.75% annual interest. The interest you earned after one year is $193. You remembered you invested three times as much in the 4% account than you did the 3.25% account. How much did you invest in each type of account? This is what i have so far, I dont think its right. x + y + Z = 4300 325x + 400Y + 575z = 19300 Y=3x x + (3x) + Z = 4300 4x + z = 4300 325x + 400 (3x) + z =19300 1525x +575z = 19300 (-575) 4x + z = 4300 (-575) -2300x - 575z =-2472500 1525x + 575z = 19300 -775x = -2453200 x=3165.4 then when I do 3 times x to get y it doesnt fit with the total of 4300. I dont know please help me thank you. 1 solutions Answer 107731 by checkley77(12569)   on 2008-07-06 16:20:48 (Show Source): You can put this solution on YOUR website! x+y+z=4300 (multiply by -.0575 & subtract. You neglected to change the % to decimals.) .0325x+.04y+.0575z=193 -.0575x-.0575y-.0575z=-247.25 -------------------------------- -.0255x-.0175y=-54.25 y=3x -.0255x-.0175*3x=-54.25 -.0255x-.0525x=-54.25 -.078x=-54.75 x=-54.25/-.078 x=695.52 amount invested @ 3.25% 3*695.52=2,086.54 amount invested @ 4% 695.52+2,086.54+y=4,300 y=4,300-695.52-2,086.54 y=1,517.94 amount invested @ 5.75% proof: .0325*695.52+.04*2,086.54+.0575*1,517.94=193 22.60+83.46+87.28=193 193~193

Equations/147302: How do I solve the equation 2x^2 + 3x + 6 = 0 1 solutions Answer 107683 by checkley77(12569)   on 2008-07-06 07:44:25 (Show Source): You can put this solution on YOUR website! 2x^2+3x+6=0 USING THE QUADRATIC EQUATION WE GET: X=(-3+-SQRT[3^2-4*2*6])/2*2 X=(-3+-SQRT[9-48])/4 X=(-3+-SQRT-39)/4 X=(-3+-6.245i)/4 X=-3/4+-1.56i

Linear-equations/147308: slope -2/3, y intercept 7, find the equation 1 solutions Answer 107682 by checkley77(12569)   on 2008-07-06 07:37:55 (Show Source): You can put this solution on YOUR website! Y=mX+b WHERE m=SLOPE & b=Y INTERCEPT. y=-2x/3+7

Linear-equations/147306: can you please solve the equation:2x (3+4x)-4x(3-6x)is greater or less than10. thank you 1 solutions Answer 107681 by checkley77(12569)   on 2008-07-06 07:36:33 (Show Source): You can put this solution on YOUR website! 2x(3+4x)-4x(3-6x)>=10 6x+8x^2-12x+24x^2-10>=0 32x^2-6x-10>=0 2(16x^2-3x-5)>=0 using the quadratic equation: we get: x=(3+-sqrt[-3^2-4*16*-5])/2*16 x=(3+-sqrt[9+320])/32 x=(3+-sqrt329)/32 x=(3+-18.14)/32 x=(3+18.14)/32 x=21.14/32 x=.66 answer. x=(3-18.14)/32 x=-15.14/32 x=-.473 answer.

Linear-equations/147307: can you please solve the equation:2x (3+4x)-4x(3-6x)is greater or less than10. thank you 1 solutions Answer 107680 by checkley77(12569)   on 2008-07-06 07:35:15 (Show Source): You can put this solution on YOUR website! 2x(3+4x)-4x(3-6x)>=10 6x+8x^2-12x+24x^2-10>=0 32x^2-6x-10>=0 2(16x^2-3x-5)>=0 using the quadratic equation: we get: x=(3+-sqrt[-3^2-4*16*-5])/2*16 x=(3+-sqrt[9+320])/32 x=(3+-sqrt329)/32 x=(3+-18.14)/32 x=(3+18.14)/32 x=21.14/32 x=.66 answer. x=(3-18.14)/32 x=-15.14/32 x=-.473 answer.

Exponents-negative-and-fractional/147303: 5/2 x +1/4 x =9/4 +x. x=? 1 solutions Answer 107678 by checkley77(12569)   on 2008-07-06 07:25:41 (Show Source): You can put this solution on YOUR website! 5/2 x +1/4 x =9/4 +x 5x/2+x/4=9/4+x 5x/2+x/4-x=9/4 (2*5x+x-4x)/4=9/4 (10x+x-4x)/4=9/4 7x/4=9/4 7x=9 x=9/7 answer. proof: 5/2*9/7+1/4*9/7=9/4+9/7 45/14+9/28=(9*7+9*4)/28 (2*45+9)/28=(63+36)/28 (90+9)/28=99/28 99/28=99/28

test/146925: what is the answer to f(x)=x^3 if f(1)= 1 solutions Answer 107591 by checkley77(12569)   on 2008-07-05 10:04:30 (Show Source): You can put this solution on YOUR website! f(x)=x^3 F(1)=1^3 F(1)=1*1*1=1 ANSWER.

Polynomials-and-rational-expressions/146946: 1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by C= 6000/200-2x What is the cost to remove 75% of the pollutant? 1 solutions Answer 107590 by checkley77(12569)   on 2008-07-05 10:02:13 (Show Source): You can put this solution on YOUR website! C= 6000/200-2x C=6000/20-2*75 C=300-150 C=$150 MILLION

Miscellaneous_Word_Problems/147222: trains a and b are traveling in the same direction on parallel tracks. train a is traveling at 80 miles per hour and train b is traveling at 90 per hour train a passes a station at 5:20 am. if train b passes the same station at 5:50 am, what time will train b catch up to train a? 1 solutions Answer 107589 by checkley77(12569)   on 2008-07-05 09:56:08 (Show Source): You can put this solution on YOUR website! 80T=90(T-.5) 80T=90T-45 80T-90T=45 -10T=-45 T=-45/-10 T=4.5 HOUR AFTER a LEAVES THE STATION THEY WILL MEET. OR @ 9:50. PROOF 80*4.5=90(4.5-.5) 360=90*4 360=360

Geometry_Word_Problems/147135: Find the verex and intercepts. Sketch the graph g(x) = x^2 + -6 1 solutions Answer 107545 by checkley77(12569)   on 2008-07-04 15:18:51 (Show Source): You can put this solution on YOUR website! g(x) = x^2 + -6 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, x^2 -6). Vertex=-6 Y Intercept=-6 X Intercepts=+-2.5

expressions/147175: simply {4x(3y-16x)}-(3x-2y) 1 solutions Answer 107508 by checkley77(12569)   on 2008-07-04 08:00:51 (Show Source): You can put this solution on YOUR website! {4x(3y-16x)}-(3x-2y) 12xy-16x^2-3x+2y x(12y-16x-3)+2y or 2y(6x+1)-x(16x+3)

Quadratic_Equations/147129: x^2-5x+2=0 1 solutions Answer 107465 by checkley77(12569)   on 2008-07-03 10:23:04 (Show Source): You can put this solution on YOUR website! x^2-5x+2=0 x=(5+-sqrt[-5^2-4*1*2])/2*1 x=(5+-sqrt[25-8])/2 x=(5+-sqrt17)/2 x=(5+-4.1231)/2 x=9.1231/2 x=4.56 answer. x=(5-4.1231)/2 x=.8769/2 x=.438 answer.

Graphs/147131: Graph the quadratic function f(x)=(x+4)^2 Thank you 1 solutions Answer 107464 by checkley77(12569)   on 2008-07-03 10:16:35 (Show Source): You can put this solution on YOUR website! f(x)=(x+4)^2 F(X)=X^2+8X+16 (graph 300x200 pixels, x from -16 to 5, y from -10 to 20, x^2 +8x +16).

Quadratic_Equations/147133: Explain how the quadratic formula can be used to factor a quadratic polynomial into two binomials. 5x² + 8x + 3. 1 solutions Answer 107463 by checkley77(12569)   on 2008-07-03 10:11:59 (Show Source): You can put this solution on YOUR website! 5x² + 8x + 3. (5X+3)(X+1)

Inequalities/147134: x - 1/3 > 4/7 1 solutions Answer 107462 by checkley77(12569)   on 2008-07-03 10:10:16 (Show Source): You can put this solution on YOUR website! x - 1/3 > 4/7 X>4/7+1/3 X>(4*3+1*7)/21 X>(12+7)/21 X>19/21 ANSWER. PROOF: LET X=20/21 20/21-1/3>4/7 20/21>4/7+1/3 20/21>(4*3+1*7)/21 20/21>(12+7)/21 20/21>19/21

Travel_Word_Problems/147094: Brian and Jake left their homes, which are 500 miles apart, and drove straight toward each other. It took 4 hours for the two to meet. If Jake's speed was 15 mph slower than Brian's speed, what was Brian's speed? 1 solutions Answer 107431 by checkley77(12569)   on 2008-07-02 15:19:18 (Show Source): You can put this solution on YOUR website! 4X+4(X-15)=500 4X+4X-60=500 8X=500+60 8X=560 X=560/8 X=70 MPH FOR THE BRIAN'S SPEED. 70-15=55 FOR JEFF'S SPEED PROOF: 4*70+4*55=500 280+220=500 500=500

Geometry_Word_Problems/147090: I need help on how to solve this word problem. (((The area of triangle is 462m^2 if the altitude is 2m longer than half the base find the altitude and base of the triangle.))) 1 solutions Answer 107430 by checkley77(12569)   on 2008-07-02 15:13:37 (Show Source): You can put this solution on YOUR website! AREA=B*H/2 462=B(B/2+2)/2 462=[B(B+4)/2]/2 462=(B^2+4B)/2*1/2 462=(B^2+4B)/4 4*462=B^2+4B 1,848=B^2+4B B^2+4B-1,848=0 USING THE QUADRATIC EQUATION: B=(-4+-SQRT4^2-4*1*-1848})/281 B=(-4+-SQRT[16+7,392])/2 B=(-4+-SQRT7,408)/2 B=(-4+-86.07)/2 B=(-4+86.07)/2 82.07/2 B=41.03 FOR THE LENGTH OF THE BASE H=2+41.03/2=2+20.52=22.52 FOR THE HEIGHT PROOF 462=41.03*22.52/2 462~462

Evaluation_Word_Problems/147059: S(t) = -16t^2 + 150t + 5 1 solutions Answer 107405 by checkley77(12569)   on 2008-07-02 11:01:56 (Show Source): You can put this solution on YOUR website! S(t) = -16t^2 + 150t + 5 using the quadratic equatio: t=(-150+-sqrt[150^2-4*-16*5])/2*-16 t=(-150+-sqrt[22,500+320])/-32 t=(-150+-sqrt22,820)/-32 t=(-150+-151.063)/-32 t=(-150+151.063)/-32 t=1.063/-32 t=-.033 answer. t=(-150-151.063)/-32 t=-302.063/-32 t=9.4 answer.

Polynomials-and-rational-expressions/147021: x-17x+23 1 solutions Answer 107370 by checkley77(12569)   on 2008-07-01 21:16:24 (Show Source): You can put this solution on YOUR website! X-17X+23 -16X+23

Square-cubic-other-roots/147029: (1/3)(9)³ = 1 solutions Answer 107369 by checkley77(12569)   on 2008-07-01 21:14:57 (Show Source): You can put this solution on YOUR website! (1/3)(9)³=1/3*6,561=2,187 ANSWER.

Linear-systems/147031: Find the x and y intercepts of each linear equation. Be sure to write your answers as ordered pairs. A. y = 3x - 6 B. 6y = -x + 2 1 solutions Answer 107368 by checkley77(12569)   on 2008-07-01 21:13:11 (Show Source): You can put this solution on YOUR website! A. y=3x-6 (0,-6) 0=3X+6 3X=-6 X=-6/3 X=-2 OR (-2,0) B. 6y=-x+2 Y=-X/6+2/6 (0,2/6) 0=-X/6+2/6 -X/6=-2/6 -X=-2 X=2 OR (2,0)

Systems-of-equations/147033: solve the system of equation using the addition (elimination method. 2x - 7y + 3 -4x + 14y = -9 1 solutions Answer 107366 by checkley77(12569)   on 2008-07-01 21:09:24 (Show Source): You can put this solution on YOUR website! 2x-7y+3 WHERE IS THE EQUAL SIGN FOR THIS EQUATION? -4x+14y=-9