Vin Mwale

This page lists questions and answers that were posted by visitors named Vin Mwale.

Questions

The following questions were asked by visitors named Vin Mwale.

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

If n(AuBuC)=12 and n(AuB)=8,find n(A'nB'nC). Solution n(A'nB'nC)=12 -8 =4

The first three terms of GP are x+1,(x^2-1) and (x^2-1)(2x-4).Calculate the value of x. Suggested solution;ar^2/ar,so r=2x-4 and a=x+1. Substitute in second term(ar)=(x^2-1). Factorise, so x=3

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).

if cosine A=0•8 find sine B

how many lines of symmetry does a rectangle have?

Answers

The following answers were posted by visitors named Vin Mwale.

AuBuC={3,4,5,6,7,8,9,10,11,}

30%=48 so 100% =more. Therefore it will be 100%/30%*48. So the answer is 160

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

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.

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%

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 5^2=4^2+(...

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=2r-2, and substitute in (¡¡) and becomes: 4+6(2r-2)=4r^2, and becomes 4r^2-12r+8=0. Which is (r-2)(r-1)=0. So...

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.

Rewrite your sum properly

Factors of 16 are: 1,2,4,8,and 16

So what is a question in your sum

Some information is needed

The least number of marbles in a box is 11

Multiply equation 1 by 2 6x+4y=38 multiply equation 2 by 3 6x-9y=18 Subtract them, then 13y=56. So y =56/13 and after substituting, x=45/13

12AB + 7B = 5A. 7B = 5A - 12AB, 7B =A(5 - 12B). Divide both sides by (5 - 12B) 7B/(5 - 12B) = A

5dm to m =0.5m. Therefore volume =L * B * H. =15*6*0.5m. =45m^3

This is too much,there is need for personal tutorial.

Fraction equal to 40litres =5/5-1/5. So 4/5 =40 litres ,what about 5/5? So its 5/5*5/4*40 litres. So the answer is 50 litres

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^n-1)/r-1. Substituting we have S9=3(2^9-1)/2-1. So the answer is 1533

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

Review your question if it is correctly asked

Any mathematical statement with an equal sign is an equation,so this is a linear equation. And 3a+2b-7 is an expression with 3 terms:3a,2b and 7.

Let the loss or profit be x, Cost Price be CP and Selling Price be SP. So SP-profit is equal to SP +loss. SP-x = SP+x. Substituting Rs2000-x=1600+x. So 2x=400 and x =Rs200. So loss or profit is Rs200 and CP is Rs1800

(11+x) (8+x)=208. X^2+19x-120=0. Factorise so x=5 or x=-24. So the value that satisfies is 5.so it is after 5 years

(9+5)^3/(5^3)=rate of increase in volume

A. P(multiple of 5)=19/99

Pie*diameter, divided by speed. (22/7*4.2*2)/6 hours.

its maths. Because std deviation is how far one is away from the mean.

equation=change in y/change in x=slope. so y--5/x-0=2/3. cross multiply so the equation will be 3y 15=2x 0

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 pow...

Yes you are right because it will be 55/100*400pages =220 pages

I would open my branket first