Umartins1:
Some Maths questions....

1. The mean of seven numbers is 10. If six of the numbers are 2, 4, 8, 14, 16 and 18. Find the mode.
2+4+8+14+16+18+x/7=10:x=8 mode=8

2. The radius of a circle is increasing at the rate of 0.02cm/s. Find the rate at which the area is increasing when the radius of the circle is 7cm.
2pi r*0.02
2*3.142*7*0.02=0.879
3. In how many ways can a student select 2 subjects from 5 subjects?
5p2=5!/2!3!=10

4. Solve for x and y in equations below:

x² - y² = 4

x + y = 2
X^2-y^2=4
X+y=2
(X+y)(x-y)=4
2(x-y)=4
X-y=2
Put x=2-y
Y=0;x=2



5. The angles of a polygon are given by x, 2x, 3x, 4x and 5x respectively. Find the value of x.
X+2x+3x+4x+5x=15x
(2n-4)90
(2*5-4)90
6*90=540
15x=540
X=36


6. Find the distance between the point (4,3) and the intersection of y=2x+4 and y=7-x.
Y=y
2x+4=7-x
3x=3
X=1
Y=6
(1 6)
(4 3)(1 6)
(1-4)^2+(6-3) ^2=18

7. If angle X is 135^o, evaluate cos X
Cos135=sin(180-135)=
Sin45=cos45=
1/ root2
8. Evaluate S² ₁(x²-4x) dx


9. The mean of seven numbers is 96. If an eight number is added, the mean becomes 112. Find the eight number.
X/7=96=672
672+x/8=112
672+x =896
X=224

10. A chord of a circle of radius 7cm is 5cm from the centre of the circle. What is the length of the chord?
7^2-5^2
49-25
24=
Root of 24=4.9
4.9*2=9.8


11. A solid metal cube of side 3cm is placed in a rectangular tank of dimensions 3cm, 4cm and 5cm. What volume of water can the tank now hold?

v.of the cube=3^3=27
V.Of tank=3*4*5=60
Total volume=60+27=87cm^3

ibadanfinest:

Maths English economics and govt are accepted that's more like a common knowledge.
Strangely commerce isnt accepted and the school is quiet about account
but miraculously, Biology qualifies you to study economics in unilag.
Guy don't mind my story, to the best of my knowledge, u are eligible with the ffg combo,
Maths, English, Econs, Govt and Biology

Tanks-a-lot, i wanted to go for accounting before but i read economics is much wider and preferable ...

Umartins1:


I swear down. Everything is from Jamb pack. I swear.


Maybe na because I no put options. I no like make ppl dey guess answer to Maths. E no good.

pls correct me oo
1. 8

2. 0.14
3. 20
4. x= -6 &y=8
5. 36
6. x=1 nd y=6
7. 0.7071
8.....i know no am
9. 224
10. h=2.8

Umartins1:
Some Maths questions....

1. The mean of seven numbers is 10. If six of the numbers are 2, 4, 8, 14, 16 and 18. Find the mode.


2. The radius of a circle is increasing at the rate of 0.02cm/s. Find the rate at which the area is increasing when the radius of the circle is 7cm.


3. In how many ways can a student select 2 subjects from 5 subjects?


4. Solve for x and y in equations below:

x² - y² = 4

x + y = 2



5. The angles of a polygon are given by x, 2x, 3x, 4x and 5x respectively. Find the value of x.


6. Find the distance between the point (4,3) and the intersection of y=2x+4 and y=7-x.


7. If angle X is 135^o, evaluate cos X


8. Evaluate S² ₁(x²-4x) dx


9. The mean of seven numbers is 96. If an eight number is added, the mean becomes 112. Find the eight number.


10. A chord of a circle of radius 7cm is 5cm from the centre of the circle. What is the length of the chord?


11. A solid metal cube of side 3cm is placed in a rectangular tank of dimensions 3cm, 4cm and 5cm. What volume of water can the tank now hold?

8.(x^3/3-2x^2+c)^2-(x^3-2x^2+c)^1
-16/3+c+5/3-c
-11/3

Umartins1:

Hahahahaha..... Funny .
Maybe we should start posting English and GP to amass viewers.

Have you any question on English or GP?

I have none now but I'll post when I'm less busy.

harbeemx:
v.of the cube=3^3=27 V.Of tank=3*4*5=60 Total volume=60+27=87cm^3

60-27 33cm³

Umartins1:

60-27 33cm³

help me check if I got the rest

@harbeemx,,,,

Kudos.


@kongru,,

Pls, show workings.


Bravo to both of you!

Umartins1:
@harbeemx,,,,
Kudos but you are off track. You are making some technical mistakes.

@kongru,,
Pls, show workings.

Bravo to both of you!

pls score me

harbeemx:
8.(x^3/3-2x^2+c)^2-(x^3-2x^2+c)^1 -16/3+c+5/3-c -11/3

You got this!!!
Bravo!

Umartins1:

You got this!!!
Bravo!

check the rest I have answered them

Umartins1:
11. An empty rectangular tank is 250cm long and 120cm wide. If 180litres of water is poured into the tank, what would be the height of the water?


12. The midpoint of P(x,y) and Q(8,6) is (5,8]. Find x and y.

13. Find the equation of a line perpendicular to line 2y=5x+4 which passes through (4,2)


14. A man walks 100m due west from a point x to Y, he then walks 100m due north to a point Z. Find the bearing of x from z.


15. The derivative of sinx/cosx is


16. Find the value of x at the minimum point of the curve y=x³+x²-x+1


17. Find S cos4x dx


18. Given that log2=0.3010, log7=0.8451. Evaluate log112

19. Find the sum to infinity of the following series 0.5+0.05+0.005....


20. what is the locus of points that is equidistant from points P(1,3) and Q(3,5)?

11.250*120*h=180000
H=6

Umartins1:
11. An empty rectangular tank is 250cm long and 120cm wide. If 180litres of water is poured into the tank, what would be the height of the water?


12. The midpoint of P(x,y) and Q(8,6) is (5,8]. Find x and y.

13. Find the equation of a line perpendicular to line 2y=5x+4 which passes through (4,2)


14. A man walks 100m due west from a point x to Y, he then walks 100m due north to a point Z. Find the bearing of x from z.


15. The derivative of sinx/cosx is


16. Find the value of x at the minimum point of the curve y=x³+x²-x+1


17. Find S cos4x dx


18. Given that log2=0.3010, log7=0.8451. Evaluate log112

19. Find the sum to infinity of the following series 0.5+0.05+0.005....


20. what is the locus of points that is equidistant from points P(1,3) and Q(3,5)?

12.
5=x+8/2. 8=y+6/2
X=2 y=10

Bro, harbeemx



Pls, can u solve the question one by one? Make it neater so that I can correct easily.

Umartins1:
Bro, harbeemx



Pls, can u solve the question one by one? Make it neater so that I can correct easily.

wow...dats a lot of stress...just check my answers

harbeemx:
12. 5=x+8/2. 8=y+6/2 X=2 y=10

Correct. But you sabi short cut oooo

harbeemx:
wow...dats a lot of stress...just check my answers

Ok. I will.

harbeemx:
11.250*120*h=180000 H=6

Correct!!!

Umartins1:
11. An empty rectangular tank is 250cm long and 120cm wide. If 180litres of water is poured into the tank, what would be the height of the water?


12. The midpoint of P(x,y) and Q(8,6) is (5,8]. Find x and y.

13. Find the equation of a line perpendicular to line 2y=5x+4 which passes through (4,2)


14. A man walks 100m due west from a point x to Y, he then walks 100m due north to a point Z. Find the bearing of x from z.


15. The derivative of sinx/cosx is


16. Find the value of x at the minimum point of the curve y=x³+x²-x+1


17. Find S cos4x dx


18. Given that log2=0.3010, log7=0.8451. Evaluate log112

19. Find the sum to infinity of the following series 0.5+0.05+0.005....


20. what is the locus of points that is equidistant from points P(1,3) and Q(3,5)?

13.m1=-1/m2
2y=5x+4
Divide through by 2
Y=5x/2+2
Gradient =5/2
M1=-1/5/2
=-2/5
Y-y1=m(x-x1)
Y-2=-2/5(x-4)
5y-10=-2x+8
5y+2x=18

[quote author=Umartins1 post=34701923]@harbeemx,,,,

Kudos but you are off track. You are making some technical mistakes.


@kongru,,

Pls, show workings.



pls score me next tym i go show workings...ds is ma first time of providing answer to online maths question

Umartins1:
11. An empty rectangular tank is 250cm long and 120cm wide. If 180litres of water is poured into the tank, what would be the height of the water?


12. The midpoint of P(x,y) and Q(8,6) is (5,8]. Find x and y.

13. Find the equation of a line perpendicular to line 2y=5x+4 which passes through (4,2)


14. A man walks 100m due west from a point x to Y, he then walks 100m due north to a point Z. Find the bearing of x from z.


15. The derivative of sinx/cosx is


16. Find the value of x at the minimum point of the curve y=x³+x²-x+1


17. Find S cos4x dx


18. Given that log2=0.3010, log7=0.8451. Evaluate log112

19. Find the sum to infinity of the following series 0.5+0.05+0.005....


20. what is the locus of points that is equidistant from points P(1,3) and Q(3,5)?

14.it requires a diagram
Tanx=100/100
Tanx=1
X=45
90+45=135

harbeemx....


Stop quoting the whole questions. Just copy the particular question you intend to solve. It's making it cumbersome to check.


Nice one, bro. You are fantastic.

[quote author=kongru post=34702540][/quote]
Ok, bro. Let me finish with harbeemx quickly.

[quote author=Umartins1 post=34699914]11. An empty rectangular tank is 250cm long and 120cm wide. If 180litres of water is poured into the tank, what would be the height of the water?


12. The midpoint of P(x,y) and Q(8,6) is (5,8]. Find x and y.

13. Find the equation of a line perpendicular to line 2y=5x+4 which passes through (4,2)


14. A man walks 100m due west from a point x to Y, he then walks 100m due north to a point Z. Find the bearing of x from z.


15. The derivative of sinx/cosx Is vdu/dx-udv/dx/v^2
Cosx*cosx-(sinx*-sinx)/cos^2x
Cos^2x + sin^2x/cos^2x
Cos^2x + sin^2x=1
1/cos^2x
Sec^2x

[quote author=Umartins1 post=34699914]
16. Find the value of x at the minimum point of the curve y=x³+x²-x+1
Integrate it
3x^2+2x-1
Quadratic equation
(3x-1)(x+1)=0
3x-1=0 or x+1=0
X=1/3 or -1

kidrossy:


Tanks-a-lot, i wanted to go for accounting before but i read economics is much wider and preferable ...

True but accounting isn't bad. you should have gone for the one u love the most

[quote author=Umartins1 post=34699914] 18. Given that log2=0.3010, log7=0.8451. Evaluate log112 Log7*2^4 Log7+4log2 0.8451+1.204= 2.0491

@harbeemx,,,,,,


This is the answer u provided and my judgement

1. The mean of seven numbers is 10. If six of the numbers are 2, 4, 8, 14, 16 and 18. Find the mode.

Your answer : 2+4+8+14+16+18+x/7=10:x=8 mode=8

correct

2. The radius of a circle is increasing at the rate of 0.02cm/s. Find the rate at which the area is increasing when the radius of the circle is 7cm.

Your answer 2pi r*0.02
2*3.142*7*0.02=0.879


wrong




Correction: A = pi r²

dA/dR= 2pi r


dr/dt= 0.02


dA/dt= dA/dr * dr/dt


= 2pi r * 0.02

= 2 * 22/7 * 7 * 0.02

= 44 * 0.02

= 0.88cm²/s

3. In how many ways can a student select 2 subjects from 5 subjects?

Your answer 5p2=5!/2!3!=10


wrong



Correction: 5C ₂

This is how you can get 10.

4. Solve for x and y in equations below:
x2- y2= 4
x + y = 2

Your answer : X^2-y^2=4
X+y=2
(X+y)(x-y)=4
2(x-y)=4
X-y=2
Put x=2-y
Y=0;x=2


correct

5. The angles of a polygon are given by x, 2x, 3x, 4x and 5x respectively. Find the value of x.

Your answer: X+2x+3x+4x+5x=15x
(2n-4)90
(2*5-4)90
6*90=540
15x=540
X=36


correct

6. Find the distance between the point (4,3) and the intersection of y=2x+4 and y=7-x.

Your answer Y=y
2x+4=7-x
3x=3
X=1
Y=6
(1 6)
(4 3)(1 6)
(1-4)^2+(6-3) ^2=18


correct but put square root.

7. If angle X is 135o, evaluate cos X

Your answer : Cos135=sin(180-135)=
Sin45=cos45=
1/ root2


wrong



Correction:
-cos (180-135)
-cos45
-1/root 2 . You didn't put minus.

9. The mean of seven numbers is 96. If an eight number is added, the mean becomes 112. Find the eight number.

Your answer
X/7=96=672
672+x/8=112
672+x =896
X=224


correct

10. A chord of a circle of radius 7cm is 5cm from the centre of the circle. What is the length of the chord?

Your answer
7^2-5^2
49-25
24=
Root of 24=4.9
4.9*2=9.8


correct

11. A solid metal cube of side 3cm is placed in a rectangular tank of dimensions 3cm, 4cm and 5cm. What volume of water can the tank now hold?

Your answer v.of the cube=3^3=27
V.Of tank=3*4*5=60
Total volume=60+27=87cm^3


wrong


Correction: you are to subtract.

Umartins1:
As dem see question, dem run commot again.

If u no score 40 over 40 ehn, I go break ur head o. OK since nobody is perfect make I give u one mark latitude. If u no score at minimum 39 over 40. I go break ur head o.
Post other subjects o, maths is just 15 out of 40 o, let's not ignore the remaining 25 o

Umartins1:
11. An empty rectangular tank is 250cm long and 120cm wide. If 180litres of water is poured into the tank, what would be the height of the water?


12. The midpoint of P(x,y) and Q(8,6) is (5,8]. Find x and y.

13. Find the equation of a line perpendicular to line 2y=5x+4 which passes through (4,2)


14. A man walks 100m due west from a point x to Y, he then walks 100m due north to a point Z. Find the bearing of x from z.


15. The derivative of sinx/cosx is


16. Find the value of x at the minimum point of the curve y=x³+x²-x+1


17. Find S cos4x dx


18. Given that log2=0.3010, log7=0.8451. Evaluate log112

19. Find the sum to infinity of the following series 0.5+0.05+0.005....


20. what is the locus of points that is equidistant from points P(1,3) and Q(3,5)?

18.a/1-r
0.5/1-0.1
0.556

[quote author=harbeemx post=34703134][/quote]



You are not done yet.


You still have to get d²y/dx²