determine whether the ratios in each pair are are proportional. 1:10;2:5  4to7;28to49?
400812
I think you meant to say which ratios are proportional.  To find that answer treat each ratio like a fraction and reduce them to their simplest form.  When in simplest form if they are equal then they are proportional.  Another method would involve cross multiplication (diagonal multiplication) in your first two proportions you would multiply 1x5 and 2x10.  If your answers are equal then the ratios are proportional.
813078
P(2 are women) = \nP(1st is woman) * P(2nd is woman) = \n6/10 * 5/9 = 30/90 = 0.333\n\nP(at least 1 is woman) =\n1 - P(both are men) =\n1 - P(1st is man)*P(2nd is man) = \n1 - (4/10)*(3/9) =\n1 - 12/90 =\n78/90 = 0.867\n\nI'm a little rusty on my "given that..." types of problems, and I'd hate to possibly steer you wrong on your remaining two questions.  But let me just say that I *THINK* the P of your 3rd question is 5/9; and I think the P of the 4th question is the same as the P of your 3rd question.\n\n~ ♥ ~
57318
9:3 simplifies to 3:1\n\ndivide both by 3 to get the answer
80769
8x-7 ....syntethic division... \n\n-5| 8 33 35\n   ___-40_35_\n    8  -7  0
759560
ok, others have told you what a ratio is\n\n\nnow you need to be careful when answering questions regarding ratios\n\nfor example\n\nIf a question was asking you the ratio of boys to girls and figures given were 5 boys and 10 girls\n\nthen the answer would be there are 5 boys to 10 ten girls\n\nwritten like this:\n\n5:10    or cancelled down to 1:2 (divided both sides by 5 to get the lowest ratio)\n\nIf however, the same figures applied but the question asked you what the ratio of girls to boys were, you would answer:\n\n2:1 (there are two girls to every one boy)\n\nyou need to read the questions carefully
995874
height and weight proportional
749268
1.45*780*132*10^9/825*555*155*10^-11\n4578*132*10^21/825*555*155\n\n\n2.115*10^9*688*10^5*9*10^3/\n256*10^5*75*10^3*245*10^2*92*10*-5\n=115*688*9*10^17/256*75*245*92*10^5\n=115*688*9*10^12/256*75*245*92
560559
9 and 4/10\n9 and 2/5\n47/5
741830
the ratio is 1:2 or 1/2\n\noh, by the way it goes like this:\n\nassuming the length of each side of square A is a, then the area is a^2.\n\nsince, the vertices of the smaller square (A) is the midpoint of the sides of the big square(B), using the diagonal of square A, we can find the sides of the bigger square.\n\nThe diagonal is a*squareroot of 2, in which when we square to get the area ===>  gives us 2a^2.\nThus, the ratio is between Square A' area (a^2) and B's area (2a^2) is 1:2 or 1/2
889429
1) Yup. a_1 - 5 = a_2, so a_1 must be 3.\n2) What does the common ratio actually mean? Its any term divided by the term before it. So in this case, the common ratio is just (-3)/(-2) = 1.5. Now, how would you get the first term? To go from the first term to the second you'd multiply by 1.5; thus to go from the second to the first, divide by 1.5: -2/1.5 = -4/3 is the first term.
907686
M1V1 = M2V2\n\nso you are starting out with a .1M times V1 is going to be equal to .08M times how ever much you need.  so you need ratios 5:1, 5:2,  5:3, and 5:4.
589231
yes here you can consider in terms of set like :\nHumanity={course1,course2,......}\nSociology=(course1,...........}\nScience=(course1,...........}\nMaths=(course1,...........}\nMusic=(course1,...........}\n\nhere n(Humanity)=3\nn(Sociology)=4\nn(Science)=5\nn(Maths)=6\nn(Music)=3\n\ntherefore no of ordered pairs will be equal to=3 x 4 x 5 x 6 x 3= 1080
901005
Use the following equation and solve:\n\nP1V1/T1=P2V2/T2\n\nT2=P2V2T1/P1V1\n\nalso note the significant figures!!!!
1098878
1) Figure the ratio of 5 3/5 to 2 1/10\nA ratio is division so you are essentially asking:\n(5 3/5) / (2 1/10)\n\nFirst convert them to improper fractions:\n(28/5) / (21/10)\n\nTo divide fractions, invert and multiply:\n(28/5) x (10/21)\n\nNow you can cancel some common factors (28 = 4x7, 21=3x7)\n(4/5) x (10/3)\n\nAnd do the same with 5 and 10 (10 = 5x2):\n(4/1) x (2/3)\n\nMultiply across:\n8/3\n\nConvert answer back to mixed fraction:\n2 2/3\n\n2) The ratio of 7 dimes to 3 quarters:\n7 dimes is 7 x10\n70 cents\n\n3 quarters is 3 x 25\n75 cents\n\nThe ratio is:\n70 / 75\n\nCancelling a common factor of 5 you have:\n14/15\n\nIn summary:\n1) 2 2/3\n2) 14/15
30019
28 - 7*2*2\n\n155 - 5*31
556524
Set up a ratio:\n\n1.5 = 4\n___  ___\n1_____x      (I put the bar there so it would stay lined up)\n\nCross multiply to get:  1.5x = 4\nDivide both sides by 1.5:  x = 4/1.5 = 2.666667 or \n2 and 2/3 cups
238182
p1    p2\n--- = ---\nq1    q2\n\n 5     2\n--- = ---\n 2    q2\n\nCross multiply,\n\n4/5