Vin Mwale
Popular questions and responses by Vin Mwale
Maths
If n(AuBuC)=12 and n(AuB)=8,find n(A'nB'nC). Solution n(A'nB'nC)=12 8 =4
asked on December 10, 2015 
Maths
The sixth term of GP is 16 and the third term is 2.Find the first term and common ratio. 6th term =16 3rd term=2 So ar^5=16 and ar^2=2, then divide. So r^3=8, and r^3 =2^3. Therefore r =2 and a=1/2
asked on December 3, 2015 
maths
how many lines of symmetry does a rectangle have?
asked on February 27, 2018 
Math
tan 39°=40/AP, So AP =40/tan. in triangle AQP, angle Q= 60/sin 91°=AP/SinQ. Then bearing of Qfrom P = 30° 180°(91 angle Q).
asked on February 13, 2018 
maths
if cosine A=0•8 find sine B
asked on February 13, 2018 
Maths
The first three terms of GP are x+1,(x^21) and (x^21)(2x4).Calculate the value of x. Suggested solution;ar^2/ar,so r=2x4 and a=x+1. Substitute in second term(ar)=(x^21). Factorise, so x=3
asked on December 19, 2015

Math
I would open my branket first
posted on February 19, 2019 
Math
Yes you are right because it will be 55/100*400pages =220 pages
posted on February 13, 2018 
Algebra
Yes Steve you right. there are 4 2^x, which means 4(2^x), which will be 2^2(2^x), then we get the powers we have 2^2 x, thats because when nultiplying numbers with same bases we just add the powers. so will be 2^2 x=2^9. we leave the bases and get the
posted on February 13, 2018 
math
equation=change in y/change in x=slope. so y5/x0=2/3. cross multiply so the equation will be 3y 15=2x 0
posted on February 13, 2018 
maths a
its maths. Because std deviation is how far one is away from the mean.
posted on February 13, 2018 
math
Pie*diameter, divided by speed. (22/7*4.2*2)/6 hours.
posted on February 21, 2016 
Math
A. P(multiple of 5)=19/99
posted on February 14, 2016 
maths
72/12
posted on February 14, 2016 
Math
(9+5)^3/(5^3)=rate of increase in volume
posted on February 14, 2016 
math
(11+x) (8+x)=208. X^2+19x120=0. Factorise so x=5 or x=24. So the value that satisfies is 5.so it is after 5 years
posted on February 14, 2016 
maths
Let the loss or profit be x, Cost Price be CP and Selling Price be SP. So SPprofit is equal to SP +loss. SPx = SP+x. Substituting Rs2000x=1600+x. So 2x=400 and x =Rs200. So loss or profit is Rs200 and CP is Rs1800
posted on January 24, 2016 
math
Any mathematical statement with an equal sign is an equation,so this is a linear equation. And 3a+2b7 is an expression with 3 terms:3a,2b and 7.
posted on January 24, 2016 
math
Review your question if it is correctly asked
posted on January 23, 2016 
Math
Kim is x+7years and May is x years old. So 3(x+7) + 5x = 165. 8x + 21 = 165. 8X= 144 X= 18. So Kim is 18+7 which is 25years and May is 18years
posted on December 30, 2015 
math
3rd term is ar^2=12 and 6th term is ar^5=96 To find r we divide 6th term by 3rd term. So r =2. Then substitute in 3rd term and so the 1st term(a) =3. So GP sum of 9 terms is S9=a(r^n1)/r1. Substituting we have S9=3(2^91)/21. So the answer is 1533
posted on December 30, 2015 
MATH
Fraction equal to 40litres =5/51/5. So 4/5 =40 litres ,what about 5/5? So its 5/5*5/4*40 litres. So the answer is 50 litres
posted on December 25, 2015 
Stats
This is too much,there is need for personal tutorial.
posted on December 24, 2015 
Math
5dm to m =0.5m. Therefore volume =L * B * H. =15*6*0.5m. =45m^3
posted on December 24, 2015 
Algebra 1
12AB + 7B = 5A. 7B = 5A  12AB, 7B =A(5  12B). Divide both sides by (5  12B) 7B/(5  12B) = A
posted on December 24, 2015 
math
Multiply equation 1 by 2 6x+4y=38 multiply equation 2 by 3 6x9y=18 Subtract them, then 13y=56. So y =56/13 and after substituting, x=45/13
posted on December 23, 2015 
Mathematics
The least number of marbles in a box is 11
posted on December 23, 2015 
Math
Some information is needed
posted on December 22, 2015 
math
So what is a question in your sum
posted on December 22, 2015 
maths a
Thats it Damon
posted on December 22, 2015 
our own English school
Factors of 16 are: 1,2,4,8,and 16
posted on December 21, 2015 
Math 8th grade
Rewrite your sum properly
posted on December 21, 2015 
math
From home the speed was 5km/hr. Back to home the speed was 3km/hr. Therefore his average speed=5km/hr+3km/hr devide by 2. That's 8km/hr divide by 2. So his average speed was 4km/hr.
posted on December 21, 2015 
math
In AP,a=4, 3rd=4+2d, 7th=4+6d. We are told that: 4=a in GP, 4+2d=4r in GP and 4+6d=4r^2. So it becomes: 4+2d=4r(¡) and 4+6d=4r^2(¡¡). So in (¡) d=2r2, and substitute in (¡¡) and becomes: 4+6(2r2)=4r^2, and becomes 4r^212r+8=0. Which is
posted on December 20, 2015 
math
Rahim's second sum............... Diameter=10cm.. Radius=10/2=5cm. So we have formed a right angled triangle with hypotenuse 5cm,height 4cm and base as half of chord. So we are to use pythagorous theorem. 5 square=4square +half chord square.. So
posted on December 20, 2015 
math
Rahim's first sum............... Cost price=100%. Gain=26%, meaning that selling price is 126% after 10% discount. So marked price before discount was 126%+10%. Therefore marked price should be at 136%
posted on December 20, 2015 
Math
Miltiply whole numbers and roots separately. So 3 one third of 90 means 10/3 root 90 and 5 root of 6 * 2/3 root 15 becomes 10/3 root 90. Therefore 10/3 root 90=10/3 root 90. Which will be 1=1 after dividing both sides by 10/3 root 90.
posted on December 19, 2015 
Maths
Thanks Reiny.
posted on December 19, 2015 
Math
Drug needed in 30ml at 2mg/ml =2mg*30 which is 60mg. Therefore number of ml at 7mg/ml =60mg/7mg. So the answer is 8.5ml of grape syrup. Conclussion: The value of ₹₹ is 8.5
posted on December 16, 2015 
Solving Percent Problems Using Equations Practice
30%=48 so 100% =more. Therefore it will be 100%/30%*48. So the answer is 160
posted on December 15, 2015 
precalc
AuBuC={3,4,5,6,7,8,9,10,11,}
posted on December 10, 2015 
Maths
X^2+(x+1^2)+(x+2^2)=365 3x^2+6x360=0 x^2+2x120=0 (x+12)(x10)=0 x=10 or 12 Answer=10,11,12 or 12,11,10
posted on December 3, 2015