Enrollment at roosevelt middle school is being reviewed by the school staff. the table gives the numbers of boys and girls in grades 6 to 9.

grade girls boys
6 9 12
7 12 18
8 15 20
9 25 36

in which two grades is the relationship between the numbers of girls and boys proportional?

the two grades that have a proportional relationship between the numbers of girls and boys are and .
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The ratio of the number of boys to the number of girls in the 6th grade and 8th grade are proportional .

Step-by-step explanation:

As given

Enrollment at Roosevelt Middle School is being reviewed by the school staff.

As the table shown in the question.

Ratio of the numbers of girls and boys of 6th grade .

Simplify the above

Ratio of the numbers of girls and boys of 7th grade .

Simplify the above

Ratio of the numbers of girls and boys of 8th grade .

Simplify the above

Ratio of the numbers of girls and boys of 9th grade .

Clearly as shown above the ratio of the number of boys to the number of girls in the 6th grade and 8th grade are proportional .

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

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