30. The average age of 20 boys is 15. Find their total age.
B.35 years
A. 20 years
D. 300 years
C. 5 years

D. 300 years

Step-by-step explanation:

Mean =

Here we know the mean which is 15 and the number which is 20

Total age = 15 × 20

Total Age = 300 years

answer: i think it's a

step-by-step explanation:

the required function is .

step-by-step explanation:

from the given table it is noticed that the graph passing through (-3,7), (0,4), (3,1) and (8,-4).

it is a linear function because the value of y is decrease by one as the value of x increase by 1.

the slope of the function is

the slope of the function is -1 and the y-intercept is 4.

the slope intercept form is

where, m is slope and b is y-intercept.

therefore the required function is . the graph of this function is shown below.