# Vin Mwale

Newest questions and responses by Vin Mwale
1. ## maths

how many lines of symmetry does a rectangle have?

2. ## maths

if cosine A=0•8 find sine B

3. ## 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).

4. ## Maths

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

5. ## Maths

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

6. ## 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

1. ## Math

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

posted on February 13, 2018
2. ## 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
3. ## math

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

posted on February 13, 2018
4. ## maths a

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

posted on February 13, 2018
5. ## math

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

posted on February 21, 2016
6. ## Math

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

posted on February 14, 2016
7. ## maths

72/12

posted on February 14, 2016
8. ## Math

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

posted on February 14, 2016
9. ## math

(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

posted on February 14, 2016
10. ## maths

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

posted on January 24, 2016
11. ## math

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.

posted on January 24, 2016
12. ## math

posted on January 23, 2016
13. ## 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
14. ## 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^n-1)/r-1. Substituting we have S9=3(2^9-1)/2-1. So the answer is 1533

posted on December 30, 2015
15. ## MATH

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

posted on December 25, 2015
16. ## Stats

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

posted on December 24, 2015
17. ## Math

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

posted on December 24, 2015
18. ## 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
19. ## math

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

posted on December 23, 2015
20. ## Mathematics

The least number of marbles in a box is 11

posted on December 23, 2015
21. ## Math

Some information is needed

posted on December 22, 2015
22. ## math

So what is a question in your sum

posted on December 22, 2015
23. ## maths a

Thats it Damon

posted on December 22, 2015
24. ## our own English school

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

posted on December 21, 2015

posted on December 21, 2015
26. ## 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
27. ## 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=2r-2, and substitute in (¡¡) and becomes: 4+6(2r-2)=4r^2, and becomes 4r^2-12r+8=0. Which is

posted on December 20, 2015
28. ## 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
29. ## 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
30. ## 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
31. ## Maths

Thanks Reiny.

posted on December 19, 2015
32. ## 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
33. ## 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
34. ## pre-calc

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

posted on December 10, 2015
35. ## Maths

X^2+(x+1^2)+(x+2^2)=365 3x^2+6x-360=0 x^2+2x-120=0 (x+12)(x-10)=0 x=10 or -12 Answer=10,11,12 or -12,-11,-10

posted on December 3, 2015