A spelling quiz by 20 boys. The mean score for the girls is 8.25 and the mean score for the ken 12 girls and score for all of boys the following, which is closest to the mean is 7.3. Of the students?

(A) 7.66
(B) 7.71
(C) 7.76
(D) 7.78
(E) 7.89

(A) 7.66

Step-by-step explanation:

Total Score= Mean X Number of Scores

For the girls, Mean Score=8.25, Number of Scores = 12

For the boys, Mean Score=7.3, Number of Scores = 20

Total Score for all Students = 99+146=245

Total number of students = 20+12=32

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7