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##### We Love to Hear from You ## Mathematics Discussions

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Posted 6 years ago in Form 2

Graph

how to find gradient on the graph

0       2

Posted on 4 years ago

M=Change in y/change in x
M=Y2-Y1/X2-X1

Posted on 6 years ago

gradient of a graph can be found using this formula

Gradient(G) = Change in y-axis / change in x-axis Posted 6 years ago in Form 3

Account

Kuna baadhi y walimu hawakusoma topic hii kipindi cha elimu yao hawakuw na hii syllabus je ni kweli?na humu shule direct nimekos topic za mathematic form 3

0       3

Posted on 5 years ago

inabidi waboreshe huduma zao

Posted on 6 years ago

KWELI JAMANI NATAFUTA TOPIC MATH F3 NIMEKOSA

Posted on 6 years ago

its not true dude Posted 6 years ago in Form 3

Sequence and series

The sum of the first n term is 2n and the sum of 2n terms is 3n.Find the sum of the first 3n terms

0       1

Posted on 6 years ago

from
Sn=A1+(n-1)d

2n=A1+(n-1)d.........eqn1
3n=A1+(2n-1)d.......eqn2
Substract eqn1 from eqn2
You get
n=nd then d=1
Therefore from eqn1
2n=A1+n-1
A1=n-1
Hence for the sum ov 3n terms
Sum =(n-1)+(3n-1)1
Sum=4n
Therefore the sum is 4n Posted 6 years ago in Form 4

Logarithim

solve for x,

116=2^x,

0       1

Posted on 6 years ago

swal zur kjn
given:116=2^x
soln:apply log base 2 both sides
log116=log2^x
log116=xlog2 NB:log ni base 2
x=log116........ Posted 6 years ago in Form 1

Number

Number

0       0 Posted 6 years ago in Form 2

Logarithms

do you know that logarithm just tells how many of one number do we multiply to get another?

0       3

Posted on 4 years ago

Put exaple with soln

Posted on 5 years ago

what is logatithms

Posted on 6 years ago

oooohh! thatz awesome didnt know that Posted 6 years ago in Form 1

Numbers

Who can help to mention prime numbers between 100 and 137

0       2

Posted on 5 years ago

101,103, 107,109, 113, 127 and 131

Posted on 6 years ago

prime numbers between 100 and 137 are: 101, 103, 107, 109, 113, 117, 119, 127, and 131. Posted 6 years ago in Form 2

Exponents

Which of the following statement is true ?

A.  -60     =  1
B.   00     =  1
C.  (-6)0  =  1
D.  (-6) =  0

0       5

Posted on 4 years ago

c is true

Posted on 5 years ago

what a tactic question b&c

Posted on 5 years ago

C

Posted on 6 years ago

'c' is true ans Posted 6 years ago in Form 2

Exponents

I want to share with you my fellow student about exponents concepts, all over us we know Any number power zero equal to 1 eg. x0 = 1 . so let prove the statement,

(x4) / (x4 ) = x4-4 = x0

Proof

(x.x.x.x)/ (x.x.x.x)

or

( x times x tmes x times x ) divide by (x times x times x times x)

if we cancel the same value means x of numerator cancel with x of denominator

results

(1 times 1 times 1 times 1) divide (1 times 1 times 1 times 1)=1 divide by 1 = 1

X0 = 1
as long as
,

x is not equal to zero

0       1

Posted on 6 years ago

thanx this is good idea you are good mathematicians. Posted 6 years ago in Form 4

Probability

Why is the probability less than or equal to 1

0       1

Posted on 6 years ago

probability = number of events/ number of sample space. since number of events cannot exceed the number of sample space but can be equal, therefore probability is always less than or equal one. Posted 6 years ago in Form 4

Probability

what does it mean when we say that (i) probability is one  (ii) probability is zero

0       3

Posted on 5 years ago

Inline with what digha has said, The probability is one when the number of expected event is equal to the number of sample space (Total events). On the other side zero probability occurs when non of the expected events can be found in the sample space

Posted on 6 years ago

(i) probability is one
The event will 100% occur.

Posted on 6 years ago

when we say that probability is one, means that we are sure of an event to occur.
probability is zero means that we are sure of an event not to occur Posted 6 years ago in Form 3

Sequence and series

Find the 37 term if the nth term in gp is 488 and sum of 10 terms is 889.

0       2

Posted on 6 years ago

nth term = G1(rn-1)
then,
sum of nth = G1(rn-1)/(r-1)

data given:
nth =488
Sn =889
so,

488 = G1(rn-1) ----(1)
889 = G1(rn-1)/(r-1) ------(2)

dividing equation 2 by 1 we get'
889/488 = (rn-1)/ (rn- rn-1)
Now from here one variable is hidden we were supposed to be given,either nth term or common ratio.

Posted on 6 years ago

the formula for nth term is Gn = G1rn-1
our nth term is 488, so 488 = G1rn-1
the sum of gp is given by Sn = G1(rn - 1) / r - 1.............(i)
the sum of 10 term is 889, so 889 = G1(r10 - 1)/ r - 1  ..........(ii)
from (ii)
889(r - 1) = G1(r10 - 1) ............(iii)
now divide (iii) by (i)
889(r - 1)/488 = G1(r10 - 1)/G1rn-1
889(r - 1)/488 = r10 - 1/rn-1
cross multiplication
889(r - 1)(rn-1) =488( r10 - 1)
889rn - 889rn-1 = 488r10 - 488
889rn - 889rn-1 -488r10 = -488
since we have two variables which are r and n within one equation, it becomes difficult to solve for r and n. Posted 6 years ago in Form 3

Penda

let us not be discourage that math's is hard

0       4

Posted on 3 years ago

yeah

Posted on 6 years ago

that is good idea lets work hard ma frend

Posted on 6 years ago

you are right, maths is very simple and not a hard subject. it just needs solving many questions and revision after a teacher's lesson.

Posted on 6 years ago

Ni kweli nakuunga mkono kijana maana idadi kubwa ya wanafunzi hususani wadada wamejenga fikra kuwa math ni ngum hivyo kupelekea kutofanya vizuri kwenye mitihani. tujitahid kuondokana na fikra hizi Posted 6 years ago in Form 4

Probability

Hello help me to solve this probability

One marble jar has several different colored marbles inside of it. It has 1 red, 2 green, 4 blue, and 8 yellow marbles. All the marbles are the same size and shape. If Peter takes out a marble from the jar without looking, what is the probability that he will NOT choose a yellow marble?

0       3

Posted on 4 years ago

The probability that he will not choose yellow is7/15

Posted on 5 years ago

Digha has give a correct answer with the easiest approach for the problem

Posted on 6 years ago

number of sample space is 1 + 2 + 4 + 8 = 15.
probability of selecting a yellow marble is = 8/15
therefore probability of not selecting a yellow marble is 1 - 8/15 = 7/15 