5. thad conducted a survey on hair color
at his school. his results were 23
students had blonde hair, 38 students
had black hair, 7 students had red hair.
and 19 students had brown hair. if he
sampled 1 out of every 10 students at
his school, how many people attend
the school?
a 900 people
b 870 people
c 820 people
d750 people

870 people attend the school.

Step-by-step explanation:

Given:

Thad conducted a survey on hair color  at his school.

His results were:

23  students had blonde hair, 38 students  had black hair, 7 students had red hair  and 19 students had brown hair.

Now, to find number of people attended school if he had sampled 1 out of every 10 students.

So, we add the total number of students who had been surveyed on hair color:

Then, we get the percentage of the sample of 1 out of 10 students:

Thus, we get that 10% of students surveyed from the total who attend the school.

Now, to get the number of people who attend school we set an equation:

Let the people attend the school be .

So,  

⇒  

⇒  

Multiplying both sides by 100 we get:

⇒  

Dividing both sides by 10 we get:

⇒  

Therefore, 870 people attend the school.

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

hi there!

the answer to this question is d: 35

step-by-step explanation:

5 to the power of 2 is 25

2 multiplied by 5 is 10

then you add the 2 numbers and you get 35