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# Recent problems solved by 'checkley77'

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 Inequalities/257104: 2y-9<-13 4z-7>7z-41 solutions Answer 191152 by checkley77(12569)   on 2010-01-22 09:43:54 (Show Source): You can put this solution on YOUR website!2y-9<-13 2y<-13+9 2y<-4 y<-4/2 y<-2 ans. 4z-7>7z-4 4z-7z>-4+7 -3z>3 z<3/-3 [note the change in signs when dividing by a negative value] z<-1 ans.
 Percentage-and-ratio-word-problems/259689: A store determines a camera’s retail price by marking up its wholesale price by twenty percent. If the store then discounts all cameras by taking twenty percent off their retail price, and the sales price is \$76.80, what is the wholesale price of the cameras? 1 solutions Answer 191144 by checkley77(12569)   on 2010-01-22 09:35:47 (Show Source): You can put this solution on YOUR website!1.2x-.2(1.2x)=76.80 1.2x-.24x=76.80 .96x=76.80 x=76.80/.96 x=\$80.00 the wholesale price. Proof: 1.2*80-.2(1.2*80)=76.80 96-.2*96=76.80 96-19.2=76.80 76.80=76.80
 Linear_Algebra/259708: how to solve 6x10exponent4-50001 solutions Answer 191135 by checkley77(12569)   on 2010-01-22 09:12:21 (Show Source): You can put this solution on YOUR website!6x10exponent4-5000 6*10^4-5000 60^4-5000 12,960,000-5,000=12,955,000 ans.
 Travel_Word_Problems/259710: Two cities are 2400 miles apart. A plane leaves one of them, traveling towards the other at an average speed of 400 miles per hour. At the same time a plane leaves the other, traveling towards the first, at an average speed of 400 miles per hour. How long will it take them to meet? It takes them [3] hours to meet? 1 solutions Answer 191131 by checkley77(12569)   on 2010-01-22 09:09:32 (Show Source): You can put this solution on YOUR website!D=RT 2,400=(400+400)T 2,400=800T T=2,400/800 T=3 HOURS THEY WILL MEET.
 Geometry_proofs/259497: I have a question about finding midpoints of a line segments when given the end points example: {-4/3,12/7},{7/4,2}1 solutions Answer 191001 by checkley77(12569)   on 2010-01-21 19:07:11 (Show Source): You can put this solution on YOUR website!{-4/3,12/7},{7/4,2} (7/4+4/3)/2 [(3*7+4*4)/12]/2 [(21+16)/12]/2 37/12*1/2=37/24 ANS. FOR THE X COORDINATE. [(2-12/7)/2] [(14-12/7)/2] 2/7*1/2=2/14=1/7 ANS. FOR THE Y COORDINATE. (37/24,1/7)
 Equations/259498: 3y-6+7y-4=1 solutions Answer 190998 by checkley77(12569)   on 2010-01-21 18:58:18 (Show Source): You can put this solution on YOUR website!3y-6+7y-4=0 3Y+7Y=4+6 10Y=10 Y=10/10 Y=1 ANS. PROOF: 3*1-6+7*1-4=0 3-6+7-4=0 10-10=0 0=0
 expressions/259494: (3x-8)(4x+3) =0 1 solutions Answer 190997 by checkley77(12569)   on 2010-01-21 18:55:15 (Show Source): You can put this solution on YOUR website!(3x-8)(4x+3)=0 3X-8=0 3X=6 X=8/3 ANS. 4X=3=0 4X=-3 X=-3/4 ANS.
 Square-cubic-other-roots/259483: A rectangular table is three times as long as it is wide. If the area is 48ft^2, find the length and the width of the table. 1 solutions Answer 190996 by checkley77(12569)   on 2010-01-21 18:52:34 (Show Source): You can put this solution on YOUR website!L=3W AREA=LW 48=3W*W 3W^2=48 W^2=48/3 W^2=16 W=SQRT(16) W=4 ANS. FOR THE WIDTH. L=3*4=12 ANS. FOR THE LENGTH. PROOF: 48=4*12 48=48
 Polynomials-and-rational-expressions/259490: (y-1)(y+1) 1 solutions Answer 190995 by checkley77(12569)   on 2010-01-21 18:48:26 (Show Source): You can put this solution on YOUR website!(y-1)(y+1) Y^2-1 ans.
 Geometry_Word_Problems/259475: x(7x-5)+4=7x(x-4)+x1 solutions Answer 190994 by checkley77(12569)   on 2010-01-21 18:47:21 (Show Source): You can put this solution on YOUR website!x(7x-5)+4=7x(x-4)+x 7x^2-5x+4=7x^2-28x+x 7x^2-7x^2-5x+28x-x=-4 22x=-4 x=-4/22 x=-2/11 ans. Proof: -2/11(7*-2/11-5)+4=7*-2/11(-2/11-4)-2/11 -2/11(-14/11-5)+4=-14/11(-2/11-44/11)-2/11 -2/11(-14/11-55/11)+4=-14/11*-2/11-14/11*-44/11-2/11 28/121+110/121+484/121=28/121+616/121-22/121 622/121=622/121
 Polynomials-and-rational-expressions/259476: Factor 9y2 – 12y + 41 solutions Answer 190987 by checkley77(12569)   on 2010-01-21 18:30:43 (Show Source): You can put this solution on YOUR website!9y2 – 12y + 4 (3y-2)^2 ans.
 Geometry_Word_Problems/259474: a certain store has a fax machine available for use by its customers. The store charges \$2.35 to send the first page and \$0.50 for each subsequent page. Use an inequality to find the maximum number of pages that can be faxed for \$8.351 solutions Answer 190986 by checkley77(12569)   on 2010-01-21 18:28:04 (Show Source): You can put this solution on YOUR website!2.35+.50X<=8.35 .50X<=8.35-2.35 .50X<=6 X<=6/.50 X<=12 IS THE MAX. NUMBER OF PAGES THAT CAN BE FAXED FOR \$8.35.
 Angles/259471: if two angles are complementary, they must both be ? angles1 solutions Answer 190984 by checkley77(12569)   on 2010-01-21 18:25:27 (Show Source): You can put this solution on YOUR website!If two angles are complementary, they must both be ACUTE angles. ACUTE ANGLES ARE LESS THAN [<] 90 DEGREES.
 Geometry_Word_Problems/258909: if 19 retangular mats measuring 1.85 m. by 5.2 m. are ordered to cover a new work space, what is the area of the wrok space? show work .1 solutions Answer 190638 by checkley77(12569)   on 2010-01-20 17:26:57 (Show Source): You can put this solution on YOUR website!19(1.85*5.2)=19*9.62=182.78 ans.
 Inequalities/258911: 3x-9<2x+61 solutions Answer 190636 by checkley77(12569)   on 2010-01-20 17:24:32 (Show Source): You can put this solution on YOUR website!3x-9<2x+6 3x-2x<6+9 x<15 ans. Proof: Let x=14 3*14-9<2*14+6 42-9<28+6 33<34
 Graphs/258913: graph y = 4x + 2 1 solutions Answer 190634 by checkley77(12569)   on 2010-01-20 17:21:14 (Show Source): You can put this solution on YOUR website!y=4x+2 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, 4x +2).
 Graphs/258914: graph y = -2x - 31 solutions Answer 190632 by checkley77(12569)   on 2010-01-20 17:18:29 (Show Source): You can put this solution on YOUR website! y=-2x-3 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, -2x -3).
 Graphs/258915: graph y = 2/3x + 1 1 solutions Answer 190629 by checkley77(12569)   on 2010-01-20 17:16:37 (Show Source): You can put this solution on YOUR website!graph y=2/3x+1 y=2x/3+1 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, 2x/3 +1).
 Linear-equations/258917: y-4=-(x-1)1 solutions Answer 190628 by checkley77(12569)   on 2010-01-20 17:12:58 (Show Source): You can put this solution on YOUR website!y-4=-(x-1) y-4=-x+1 y=-x+1+4 y=-x+5 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, -x +5).
 Money_Word_Problems/258824: Shelly Egan works as a stocker at a grocery store during summer vacation. She gets paid a standard hourly rate for her day hours but a higher hourly rate for any hours she works during the night shift. One week she worked 17 daylight hours and 8 nighttime hours and earned \$191. The next week she earned \$219 for a total of 12 daytime and 15 nighttime hours. What is the rate she is being paid for daytime hours and what is the rate for nighttime hours? email addy: mom22bizeegurls@ymail.com1 solutions Answer 190626 by checkley77(12569)   on 2010-01-20 17:06:02 (Show Source): You can put this solution on YOUR website!17x+8y=191 multiply by 15. 12x+15y=219 multiply by -8 & add. 255x+120y=2,865 -96x-120y=-1,752 --------------------- 159x=1,113 x=1,113/159 x=\$7 is the hourly rate for daytime hours. 17*7+8y=191 119+8y=191 8y=191-119 8y=72 y=72/8 y=\$9 is the hourly rate for nightime hours. Proof: 12*7+15*9=219 84+135=219 219=219
 Numeric_Fractions/258826: Find the ratio of the longest side to the perimeter 8 ft by 15 ft by 17 ft show work1 solutions Answer 190624 by checkley77(12569)   on 2010-01-20 16:55:14 (Show Source): You can put this solution on YOUR website!17:(8+15+17)=17:40 ans.
 Angles/258876: Two angles are complementary. One angle measures 26 degrees more then the other. Find the measures of the angles and explain your answer.1 solutions Answer 190621 by checkley77(12569)   on 2010-01-20 16:49:21 (Show Source): You can put this solution on YOUR website!X+X+26=90 2X=90-26 2X=64 X=64/2 X=32 DEGREES FOR THE SMALLER ANGLE. 32+26=58 DEGREES FOR THE LARGER ANGLE. PROOF: 32+58=90 90=90
 Travel_Word_Problems/258877: two plains left an airport at the same time and flew in opposite directions. the rate of the Boeing was twice that of the Airbus. after 3 hours they were 2250 miles apart. wahat was the rate of the faster plane?1 solutions Answer 190618 by checkley77(12569)   on 2010-01-20 16:46:23 (Show Source): You can put this solution on YOUR website!3(x+2x)=2,250 3*3x=2,250 9x=2,250 x=2,250/9 x=250 mph. for the Boeing plane. 2*250=500 mph. for the Airbus plane.
 Linear-equations/258885: I need help in finding the slope for (0,-9) and (-4,0) thanks 1 solutions Answer 190615 by checkley77(12569)   on 2010-01-20 16:39:40 (Show Source): You can put this solution on YOUR website!(0,-9) and (-4,0) Slope=(y2-y1)/(x2-x1) Slope=(0+9)/(-4-0) Slope=9/-4=-9/4=-2.25 ans.
 Number-Line/258889: in a number line with 7 equally spaced ticks, the second one is 2 and the last one is 42 and there are four tick marks between them. What is the the value of the second of those 4 tick marks? (im sorry i cudnt draw the figure, so i had to explain the question this way) 1 solutions Answer 190613 by checkley77(12569)   on 2010-01-20 16:36:53 (Show Source): You can put this solution on YOUR website!(7-2)x=42-2 5x=40 x=40/5 x=8 the number of spaces between each tick. 2+(2*8)=2+16=18 is the value of the second of the 4 ticks.
 Inequalities/258890: Use the appropriate property of inequality to solve: 7r/12= -14 I tried: 7r/12 x 12 = 12 x (-14) 7r = -2 7r/7=-2/7 r=-2/7 ?1 solutions Answer 190609 by checkley77(12569)   on 2010-01-20 16:29:37 (Show Source): You can put this solution on YOUR website!7r/12=-14 cross multiply. 7r=-14*12 7r=-168 divide both sides by 7. r=-168/7 reduce the fraction. r=-24 ans.
 Exponents/258897: (x^4)^31 solutions Answer 190608 by checkley77(12569)   on 2010-01-20 16:24:37 (Show Source): You can put this solution on YOUR website!(x^4)^3 x^(4*3) x^12 answer.
 Linear-equations/258895: Write the point-slope equation of the line that goes through (1, 4) with a slope of -10.1 solutions Answer 190605 by checkley77(12569)   on 2010-01-20 16:22:49 (Show Source): You can put this solution on YOUR website!(1,4) m=-10 Y=mX+b 4=-10*1+b 4=-10+b b=4+10 b=14 the y intersect. Y=-10x+14 (graph 300x200 pixels, x from -6 to 5, y from -10 to 15, -10x +14).
 Angles/258893: What is the measure of the angle that is complementary to 30 degrees1 solutions Answer 190604 by checkley77(12569)   on 2010-01-20 16:18:00 (Show Source): You can put this solution on YOUR website!30+x=90 x=90-30 x=60 degrees is the complementary angle.
 Pythagorean-theorem/258537: the skating rink's surface is a rectangle of 85 feet by 200 feet. which is closest to the diagonal length of the skating rink? a)217 ft b)285 ft c)434 ft d)570 ft1 solutions Answer 190370 by checkley77(12569)   on 2010-01-19 19:11:02 (Show Source): You can put this solution on YOUR website!85^2=200^2=x62 7,225+40,000=x^2 x^2=47,225 x=sqrt47,225 x=217.31 ans. A)
 Proportions/258538: 14/18=21/n 1 solutions Answer 190363 by checkley77(12569)   on 2010-01-19 19:05:52 (Show Source): You can put this solution on YOUR website!14/18=21/n 14n=18*21 14n=378 n=378/14 n=27 ans. Proof: 14/18=21/27 7/9=7/9