What is the value of k?
4/5 k - 1/10 k = 1/2 k +1

what is the value of k?

4/5 k - 1/10 k = 1/2 k +1

the answer is k = 5

Step-by-step explanation:

from the question  what is the value of k?

4/5 k - 1/10 k = 1/2 k +1

by rearranging, we have;

4k/5 - k/10 =k  + 1/ 2

finding the lcm of the RHS  which is 10

2(4k) - k/10 = k+ 1/2

8k-k/ 10 = k + 1 /2

finding the lcm of the R

LHS  which is 2

we have

7k/10 = k + 2/2

by cross multiplying

14k = 10k + 20

collect the lie terms

14k - 10k = 20

4k = 20

divide both sides by 4

k = 5

nothjing

step-by-step explanation:

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

click to let others know, how is it

0.0

0 votes

1

report

read more on -

step-by-step explanation: